JPH0643535Y2 - High speed rotor thrust bearing collar - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a thrust bearing collar in the case where the thrust bearing collar cannot be integrally attached to the shaft of the rotor, that is, it must be fitted, as in a barrel type compressor. Regarding the shape of.

[Prior Art] Three typical examples of the prior art are shown in FIG. 2 to FIG.

In FIG. 2, the shaft 1 is provided with a taper portion 2, the collar 3 is pushed in under a large interference, and the collar 4 is stopped. Shrink-fitting may be used instead of push-fitting. Also,
In FIG. 2, reference numeral 5 is a key, and 6 is a thrust pad. According to this method, at a high speed, a large tightening allowance or shrink fitting allowance is required to prevent the inner diameter of the collar from expanding due to centrifugal force and creating a clearance between the collar and the outer circumference.
Not easy to assemble. In addition, if there is a gap, the center of the collar and the shaft are displaced, causing imbalance and causing vibration.

FIG. 3 shows that the sleeve 7 is integrally attached to the collar 3 and is tightly fitted on the shaft at a portion 8 apart from the collar. The influence of the centrifugal force of the collar on the fitting portion with the shaft is smaller than that in the case of FIG. 2 and is somewhat improved, but the arrow core is apt to be misaligned.

In order to improve the difficulty of assembling in the case of FIG. 2, FIG. 4 shows that a hole 9 is provided at the center of the end of the shaft 1 so as to communicate with a radial hole 10 toward the inner diameter of the collar 3, It supplies oil to inflate the collar and insert it into the shaft. According to this method, the assembly is fairly easy, but the processing is complicated, and a large tightening margin that exceeds the expansion amount of the inner diameter due to centrifugal force must be given, which may distort the surface of the collar. Is the same as Example 1 in FIG. In addition, 11 is an "O" ring that prevents oil leakage.

[Problems to be solved by the invention]

As described above, the assembled thrust bearing collar is not easy to assemble, and the structure is complicated when the assembly is facilitated. When the tightening margin for the shaft is small, the inner circumference of the collar expands and floats up from the shaft due to the centrifugal force of the collar at high speed rotation, which causes misalignment due to misalignment of the shaft center of the collar, often causing vibration. . If the tightening margin is large, the assembly is not easy and the surface of the collar may be distorted so that the surface is not correct.

[Means for solving problems]

In order to solve the problems of the prior art, the present invention provides a sleeve having a predetermined length on both sides of the base of the collar, and the extension of each of the sleeves is tightly fitted on the shaft. The above-mentioned predetermined length refers to a length in which the deformation of the collar due to the centrifugal force of the material does not affect the fitting portion between the sleeve and the shaft in terms of material mechanics, and the formula is shown in the examples.

[Action]

According to the present invention, assembling becomes easy, and even if the fitting portion is slightly tightened, the collar axis does not shift during high speed rotation.
Therefore, no inconvenience occurs and stable high-speed rotation without vibration is maintained.

〔Example〕

FIG. 1 shows an embodiment of the present invention. The sleeves 12 and 13 are provided on both sides of the collar 3 and the collar 1, and the sleeve length l,
The following relationship is established between the average radius a of the sleeve and the thickness t of the sleeve.

The sleeve 12 is press-fitted to the shaft 1 at a distance 14 from the collar 3, and the sleeve 13 is also press-fitted to a shaft 15 at a distance 15 from the collar 3 and then attached to the shaft 1 by the key 5.

Due to the material mechanics, in the case of an elastically deforming thin-walled cylinder, if it is separated by more than the length shown in the equation (1), the axially symmetrical deformation of a certain portion, in FIG. Therefore, no matter how the collar 3 is deformed by the centrifugal force due to the rotation and the thrust force applied in the axial direction, the fitting portions 14 and 15 with the shaft 1 are not affected, and the fitting portions 14 and 15 are Only the amount of swelling due to the centrifugal force of oneself is transformed. This bulge is much smaller than the bulge of color 3,
The tightening amount is small, assembly is extremely easy, and the shaft 1
Will not be distorted by the sleeve fitting. On the other hand, since the collar 3 is supported by the both end portions 14 and 15, the shaft center of the collar 3 is surely held concentric with the shaft 1, and there is no unbalance at all even at high speed rotation.

The present invention can also be applied to a high-speed rotating machine having an axially assembled vehicle interior structure without a horizontal flange, such as a gas turbine for small and medium-sized vessels.

[Effect of device]

As described in detail above, according to the present invention, the assembly is easy,
Moreover, the centrifugal force and thrust of the collar do not affect the fitting portion between the collar and the shaft even during high-speed rotation, so that the center of the collar does not deviate from the shaft center even with a small tightening margin. Therefore, imbalance and vibration do not occur, and stable high-speed rotation can be maintained.

[Brief description of drawings]

FIG. 1 is an assembly sectional view showing an embodiment of a thrust collar of a high speed rotor according to the present invention, and FIGS. 2 to 4 are assembly sectional views showing three typical examples of a conventional system. 1 ... Shaft, 2 ... Taper part, 3 ... Collar, 4 ... Nut, 5 ... Key, 6 ... Thrust pad, 12, 13 ...
Sleeves, 14,15 ... Mating part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasushi Mori 2-1-1, Niihama, Arai-cho, Takasago-shi, Hyogo Prefecture Mitsubishi Heavy Industries, Ltd. Takasago Plant (72) Inventor Masaaki Kobayashi 2-chome, Niihama, Arai-cho, Takasago-shi, Hyogo No. 1 in Takasago Plant, Mitsubishi Heavy Industries, Ltd. (56) References: Actually open Sho 57-1954 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A thrust bearing collar is provided with sleeves on both sides of the base, and a gap is formed at a portion corresponding to the inner diameter of the sleeve and the shaft, so that the length of each of the one-sided sleeves not in contact with the shaft is the average radius of the sleeve. 1.8 times the square root of the product of the product of the sleeve thickness or more,
A thrust bearing collar for a high-speed rotor, characterized in that it is configured to have an interference fit on the shaft on both sides due to its extension.