JPS606093A - Rotary type compressor - Google Patents

Abstract

PURPOSE:To enhance the accuracy of the assembling, by fitting a ring-like strain absorbing member made of soft metals onto the outer peripheral section of a circular cylinder, and as well by securing the strain absorbing member in a closed casing by means of shrinkage fit. CONSTITUTION:A strain absorbing member 13 made of soft metals such as, for example, aluminum, is in a ring-like shape, having free end parts 14 in a part thereof. The inner diameter D of the strain absorbing member 13 slightly less than the outer diameter of the circular outer peripheral section 8a of a rotor bearing 8, and therefore, the strain absorbing member 13 is fitted onto the rotor bearing 8 after enlarging of the free end parts 14 of the member 13, and is fastened by the resiliency of the strain absorbing member itself. Any strain which is brought about in the rotor bearing by fastening force of a closed casing 2 due to shrinkage-fit, is absorbed by the strain absorbing member 3, thereby the accuracy of the assembling is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotary compressor used in a refrigerator-freezer, etc., and particularly relates to a rotary compressor in which a circular bearing or cylinder is shrink-fitted to a sealed case. The mold compressor will be explained with reference to FIG.

1 is a rotary compressor, 2 is a closed case, 3 is a motor stator, 4 is a rotor, and 6 is a crankshaft. Reference numeral 6 denotes a roller, which is arranged on the eccentric portion of the crankshaft 5 and on the outer periphery thereof. The end is the cylinder, 8 is the rotor side bearing, 9 is the anti-rotor bearing, and 10 is the discharge cup. Reference numeral 11 is a rough through hole, and reference numeral 12 is a refrigerating machine oil.

In such a configuration, when the rotor side bearing 8 whose outer peripheral portion 8a is circular is fixed to the sealed case 2 by firing,
The outer peripheral portion 8aK of the rotor-side bearing 8 is subjected to a tightening force due to contraction of the sealed case 2.

Especially when the finishing accuracy of the inner circumference of the sealed case 2 is poor,
If the tightening force is not evenly applied to the outer circumferential portion 8a of the bearing 8 on the opposite side, but applied unevenly, large distortions will occur, deteriorating assembly accuracy, and reducing the efficiency of the three-wire machine. Ta.

Purpose of the Invention The present invention prevents deterioration of assembly accuracy by uniformly applying the tightening force due to the above-mentioned baking process to the bear 1 nong, thereby reducing distortion of the bear 1 nong, etc. The purpose is to prevent a decline in efficiency.

Structure of the Invention In order to achieve this object, the present invention attaches a ring-shaped strain absorbing material made of soft metal to the outer periphery of a circular bearing or cylinder, which is attached by its elasticity, and then heats it inside a sealed case. By identifying the fit, the strain caused by the shrink fit of the bearing or cylinder is absorbed by the strain absorbing material, thereby preventing deterioration of assembly precision and thereby preventing a decrease in efficiency. This is how it was done.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In order to avoid duplication of explanation, the same parts as in the conventional example are given the same reference numerals and the explanation thereof will be omitted.

Reference numeral 13 denotes a strain absorbing material made of a soft metal such as aluminum, which is ring-shaped as shown in FIG. 3, and has a free end 14 at one part. The inner diameter of this strain absorbing material 13 is slightly smaller than the outer diameter of the circular outer peripheral portion 8a of the rotor side bearing 8, and by widening the free end portion 14, the inner diameter can be increased.

The strain absorbing material 13 is fitted into the rotor-side bearing 8 and can be tightened and fixed to the outer circumferential portion 8a of the rotor-side bearing 8 due to the elasticity of the strain absorbing material 13 itself.

Additionally, the free end portion 14 of the strain absorbing material 13 is bent several times so as to be located below so as to form a rough through hole between the outer peripheral portion 8a of the rotor side bearing 8 and the sealed case 2. In this way, the rotor-side bearing 8, which has the strain absorbing material 13 on the outer circumference 8a, is inserted into the sealed case 2, which has been heated and its inner diameter expanded, and when the heated sealed case 2 cools down. As a result, the expanded inner diameter returns to its original state, and the inner wall of the sealed case 2 tightens the strain absorbing material 13 provided on the outer peripheral portion 8a of the rotor side bearing 8, and the strain absorbing material 1
3 further tightens the rotor side bearing 8,
The rotor side bearing 8 is fixed to the sealed case 2 by shrink fitting.

In this configuration, by attaching the strain absorbing material 13 to the outer circumferential portion 8a of the rotor side bearing 8 in advance by its own elasticity, the rotor side bearing 8 can be attached while the strain absorbing material 13 is installed inside the sealed case 2. Said to be fixed. There is no need to use a complicated fixing method, and the sealed case 2 can be attached using the same method as the conventional shrink fit of the rotor side bearing 8.
Shrink fit can be identified. In this way, by attaching the strain absorbing material 13 to the outer peripheral part 8a of the rotor side bearing 8 and fixing the rotor side bearing 8 in the sealed case 2 by shrink fitting, the tightening force of the sealed case 2 due to the shrink fit causes the rotor side to The strain that was previously caused in the bearing can now be absorbed by the deformation of the strain absorbing material 13. In addition, even if the finishing accuracy of the inner circumference of the sealed case 2 is poor, the strain absorbing material 13
is deformed along the inner periphery of the sealed case 2, and the tightening force applied to the outer periphery 8a of the rotor (ill bearing 8) becomes uniform, and the force is not unevenly applied to a part of the outer periphery 8a, causing distortion. As a result, it is possible to prevent deterioration of assembly precision and efficiency.Furthermore, the vibrations of the crankshaft 25 etc. are transmitted through the rotor side bearing 8, vibrating the sealed case 2 and causing noise. However, the distortion absorbing material 13 can attenuate the vibrations of the crankshaft, etc., and the sealed case 2 will not vibrate due to the influence of the vibrations of the crankshaft, etc., thereby suppressing the generation of noise. 'Effects of the Invention As described above, the present invention incorporates a ring-shaped strain absorbing material that is made of soft metal and is attached to the outer periphery of a circular bearing or cylinder using its elasticity. '', the distortion of the bearing or cylinder due to the tightening force of the sealed case due to shrinkage fit can be absorbed by deformation of the strain absorbing element, preventing deterioration of assembly precision and resulting reduction in efficiency. Furthermore, since the vibrations of the crankshaft and the like can be attenuated by the strain absorbing material, noise can be reduced by suppressing the vibrations of the sealed case.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional rotary compressor, FIG. 2 is a sectional view of a rotary compressor showing an embodiment of the present invention, and FIG. 3 is a perspective view of a strain absorbing material. 2. Sealed case, 5. Crankshaft, 7.
・Cylinder, 8・Bearing, 13...Strain absorbing material. Name of agent: Patent attorney Toshio Nakao (1st person)
Diagram porridge 2

Claims (1)

[Claims] A ring-shaped strain absorbing material made of a soft metal is attached to the outer periphery of the circular bearing or cylinder by its elasticity, and the bearing or cylinder is fixed in a sealed case through the strain absorbing material by shrink fitting. Rotary compressor.