JPH0610620U - One-sided prevention type bearing - Google Patents

Abstract

(57) [Summary] [Purpose] This is a journal bearing that is applied to bearings of rotating machinery in general to prevent uneven contact. The tilting pad supports the rotating shaft without causing uneven contact. [Configuration] Pad width 50 on only one side of the back surface of the bearing pad
Equipped with a relief that does not exceed%.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a journal bearing that is applied to bearings of rotary machines in general and that prevents one-sided contact, and particularly prevents pad seizure of a pad type rotary shaft seal.

[0002]

[Prior art]

 FIG. 5 is a block diagram showing a conventional tilting pad type journal bearing. The rotary shaft 01 is supported by a plurality of tilting pads 02 arranged on the outer circumference thereof, and each tilting pad 02 is housed in a bearing housing 03 located on the outer circumference thereof.

There is lubricating oil between the rotating shaft 01 and the tilting pad 02 while the bearing is in use, and the weight of the rotating shaft 01 is indirectly supported by the lubricating oil.

On the other hand, although there is often lubricating oil between the tilting pad 02 and the bearing housing 03, the tilting pad 02 itself does not rotate, so that it makes a metal contact.

In this case, the tilting pad 02 is generally designed to fall while keeping parallel to the axis center so that the tilting pad 02 can freely fit on the rotation axis 01. Therefore, the tilting pad 02 and the bearing housing 03 are in line contact with each other.

[0006]

[Problems to be solved by the device]

 However, in the conventional example, (1) when the rotating shaft is longer than the bearing diameter, the bearing gap on one side of the journal bearing becomes small, and seizure or flaws often occur.

(2) In the case of a cantilever type rotor, bearing seizure at start-up due to tilt of the rotor and seizure due to one-sided contact due to vibration during operation occur.

(3) When the temperature difference on both sides of the bearing in the axial direction is large, the concentricity changes due to the difference in expansion on both sides of the bearing, the rotor is one-sided, and the bearing pad is seized. There are drawbacks such as.

The present invention is intended to eliminate the above-mentioned drawbacks, and is intended to prevent seizure of a bearing portion and scratches.

[0010]

[Means for Solving the Problems]

 The present invention solves the above-mentioned conventional problems, and is a tilting pad type bearing, in which a relief not exceeding 50% of the pad width is provided on only one of the back surfaces of the bearing pads.

That is, according to the present invention, the tilting pad is provided only on one side in the axial direction on the back surface of the tilting pad, so that the tilting pad can tilt and follow in the same direction as the center line of the rotating shaft even if the rotating shaft tilts. This is the bearing.

[0012]

[Action]

 In conventional tilting pad bearings, the back surface of the pad is often a cylindrical surface because of the ease of design and quality control during assembly.

With the tilting pad structure of the present invention, it is possible to tilt in the axial direction while maintaining its superiority. Moreover, since the line contact part is left in the contact part with the bearing housing, the allowable bearing load can be handled as the same as the conventional product.

[0014]

【Example】

 1 and 2 show a first embodiment of the present invention and are configuration diagrams. Further, FIG. 3 is an operation state diagram thereof. Reference numeral 1 is a rotary shaft, 2 is a tilting pad, 3 is a bearing housing, and 4 is a relief provided on the tilting pad 2.

As shown in FIG. 1, one of the back surfaces of the tilting pad 2 is formed into a spherical surface to provide a relief 4 for preventing one-sided contact. The three-dimensional view is shown in FIG. Specifically, the dimension for the escape 4 is a <b.

By doing so, the one-sided contact prevention pad 2 having the advantages of the conventional cylindrical pad can be constructed, and the tilting pad 2 can be tilted in the direction in which the escape 4 is provided when a load is applied. .

FIG. 4 shows a second embodiment of the present invention. In FIG. 4, a partial chamfer 5 is provided instead of the spherical surface on the back surface of the tilting pad to improve the tilting.

Since the back surface of the conventional product is formed of a cylindrical surface, it is possible to improve the inclination by simply chamfering one of the back surfaces.

In each of the first and second embodiments, it is important that the sphere processing length and the chamfering length are less than 50% of the axial width (length).

[0020]

[Effect of device]

 The present invention, while retaining the characteristics of the conventional tilting pad bearing, facilitates dimensional control (quality control) during assembly and allows the tilting pad to tilt in the axial direction.

FIG. 3 is an operation diagram of the present invention. When the rotating shaft is tilted as shown in the drawing, only the tilting pad that bears the load tilts, and the tilting pad on the opposite side does not tilt when assembled. It operates in the state of.

As a result, the load pad, which is important as a bearing, is in parallel with the rotating shaft and supports the shaft without any one-sided contact. The pad that does not tilt has a small gap with the rotating shaft, and the spring constant at that portion increases, which has the effect of helping the stability of the rotating shaft.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is a perspective view of the tilting pad of FIG.

FIG. 3 is a sectional view showing an operating state of the present invention.

FIG. 4 is a sectional view of a second embodiment of the present invention.

FIG. 5 is a cross-sectional view of a conventional tilting pad type journal bearing.

[Explanation of symbols]

 1 rotating shaft 2 tilting pad 3 bearing housing 4 relief 5 partial chamfer

Claims (1)

[Scope of utility model registration request] A tilting pad type bearing, wherein a relief not exceeding 50% of a pad width is provided on only one of the back surfaces of the bearing pad.