JPH02275072A - Enclosed motor compressor - Google Patents

Abstract

PURPOSE:To perform lubrication between a large end part and an eccentric part so favorably by by forming a specified longitudinal groove and an interconnecting hole in an oil sump in the eccentric part of a crankshaft where the large end part of a connecting rod connected to a piston is inserted. CONSTITUTION:In a crankshaft 2, a large end part 9a at the other end of a connecting rod 9, whose one end is connected to a piston, is inserted into an eccentric part 10 at the upper end, while an oil passage 2c is installed in the main shaft part. This oil passage 2c is pierced through up to an oil discharge port 12 in an upper end of the eccentric part 10 by way of a hollow oil sump 11 in the eccentric part 10. In this case, a longitudinal groove 20 is formed in an eccentric position on an inner wall of the oil sump 11 in parallel with the axial direction of the eccentric part 10. Then, the longitudinal groove 20 and the circumference of the eccentric part 10 are interconnected to each other through an interconnecting port 21. With this constitution, oil is smoothly fed to the circumference of the eccentric part 10 in use of centrifugal force, through which lubrication in a gap with the large end part 9a is well performed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hermetic compressor used as a drive source for small refrigeration equipment.

Background of the Invention In recent years, as hermetic compressors have become smaller and more efficient, lubrication and cooling technologies have become more important.

An example of the conventional hermetic compressor mentioned above will be described below with reference to the drawings.

FIGS. 3 and 4 are cross-sectional views showing the structure of a conventional compressor as disclosed in Japanese Patent Publication No. 63-57827.

In FIG. 3, reference numeral 1 denotes an electric element, which consists of a rotor 3 and a stator 4 directly fixed to the main shaft portion 2aK of the crankshaft 2. A casing 6 fixes the stator 4 and the cylinder 6. 7 is a compression element, which includes a cylinder 6, a piston 8.
Connecting rod9. A piston 8, which is constructed from the crankshaft 2, is connected to the crankshaft 2 via a large end 9a of a connecting rod 9, and is loosely fitted into the cylinder e. crankshaft 2
The main shaft portion 2a is composed of an eccentric portion 10 and a main shaft portion 2a, and the main shaft portion 2a has an oil pump portion 2b at its lower end. Reference numeral 2a denotes an oil passage provided in the longitudinal direction of the crankshaft 2, which runs from the oil pump section 2b to the eccentric section 10 via a hollow oil reservoir 11 provided on the eccentric shaft 1o.
It penetrates to the oil discharge port 12 at the upper end. The eccentric portion 1o is provided with a horizontal hole 10a for sending oil to the outer periphery of the eccentric portion 1a. Furthermore, an oil groove 10b for guiding oil upward is provided on the outer periphery of the eccentric portion 1°.

Reference numeral 13 denotes a sealed container that houses the compression element 7 and the electric element 1 and also stores oil 14.

The operation of the hermetic compressor configured as above will be described below.

Due to the rotation of the electric element 1 and shift flank shaft 2, hydraulic pressure is generated in the oil 14 in the geo-oil pump section 2b, and the oil 14 rises in the oil passage 2c, and the raised oil 14
A part of the oil flows out through the horizontal hole 10a provided in the eccentric portion 1o and lubricates the sliding portion of the oil groove 10b. Also, remaining oil 1
4 flows out from the oil discharge port 12 and lubricates the sliding portion of the piston (not shown).

Problems to be Solved by the Invention However, in the above configuration, oil fills the oil sump 11, and the oil reaches the communication hole 10a and the eccentric portion 1.
Since the OLA circumferential surface is not lubricated, there is a problem in that it takes a long time from the start of the compressor until the lubrication takes place, which shortens the life of the compressor.

In view of the above problems, the present invention provides a hermetic electric compressor that lubricates the outer periphery of the crank portion within a short time after the start of operation and has a long life.

Means for Solving the Problems In order to solve the above problems, the compressor of the present invention includes an oil sump that is hollow in the axial direction of the eccentric portion, and an oil sump that is located on the inner wall surface of the oil sump in the eccentric direction. A vertical groove is provided parallel to the axial direction of the eccentric part, and the outer peripheral sliding surface of the eccentric part and the vertical groove are communicated through a communication hole.

Operation The present invention has the above-described configuration, and oil flows upward using the hydraulic pressure generated in the geo-oil pump section as the crankshaft rotates. Furthermore, the oil is poured into a hollow oil reservoir provided in the eccentric part, and due to centrifugal force, the oil first fills the vertical grooves, and then the oil in the vertical grooves passes through the communication hole, and then a small amount of oil is transferred to the eccentric part in a short time. Lubricate the outer sliding surface.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. In addition, parts that are the same as those in the conventional example will be explained using the same symbols.
The parts with the same structure and operation will be omitted.

In Figures 1 and 2, 2o is a vertical groove.

It is provided on the inner wall surface of the hollow oil reservoir 11 at a position in the eccentric direction and parallel to the axial direction of the eccentric portion 10 . 21 is a communicating hole that connects the outer peripheral surface of the eccentric portion 1o and the vertical groove 2o.
are communicating. In the above configuration, the oil 14 reaching the hollow oil reservoir 11 immediately gathers in the vertical groove 20 due to centrifugal force and fills the vertical groove 20 because the vertical groove 20 is provided at an eccentric position. This oil 14
passes through the communication hole 21 and immediately reaches the outer periphery of the eccentric portion 1o,
Controls lubrication between the connecting rod 9 and the large end 9a.

Therefore, the oil 14 that has reached the oil reservoir 11 performs a lubricating action in an extremely short period of time, thereby preventing abnormal wear, seizure, etc. between the large end portion 9a and the outer periphery of the eccentric portion 1o.

Effects of the Invention As described above, the present invention includes a connecting rod connected to a piston, and a crankshaft having an eccentric portion at the upper end into which the large end of the connecting rod is inserted, and the eccentric portion has a shaft attached to the crankshaft. an oil sump that is hollow in the direction, and a vertical groove is provided on the inner wall surface of the oil sump at a position in the eccentric direction parallel to the axial direction of the eccentric part, and the outer peripheral sliding surface of the eccentric part and the vertical groove are provided at positions in the eccentric direction. By connecting the grooves through the communication hole, the oil that reaches the oil reservoir performs a lubricating action in an extremely short period of time, which prevents abnormal wear, seizure, etc. between the large end of the connecting rod and the outer periphery of the eccentric part. This makes it possible to realize a hermetic compressor with a long service life.

[Brief explanation of drawings]

Fig. 1 is a sectional view of essential parts in an embodiment of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, Fig. 3 is a sectional view of a conventional compressor, and Fig. 4 is a sectional view of a conventional compressor. FIG. 2 is a sectional view of main parts of the compressor. 2...Crankshaft, 9...Connecting rod, 9
a...Big end, 1o...Eccentric part, 11
・・・・・・Oil sump, 2゜・・・Vertical groove, 2
1...Communication hole. Name of agent: Patent attorney Shigetaka Awano 1 person Shit 2f・-encounter” Higashikou

Claims (1)

[Claims] The crankshaft includes a connecting rod connected to a piston, and an eccentric portion at the upper end into which the large end of the connecting rod is inserted, and the eccentric portion has an oil reservoir that is hollow in the axial direction thereof, and an oil reservoir that is hollow in the axial direction of the eccentric portion. A closed type electric motor, wherein a vertical groove is provided on the inner wall surface of the reservoir at a position in the eccentric direction, parallel to the axial direction of the eccentric part, and the outer peripheral sliding surface of the eccentric part and the vertical groove are communicated through a communication hole. compressor.