JPH0134973Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention relates to a damper-type bearing that absorbs vibrations and shocks, and is improved to prevent cavitation from spreading.

<Prior art> Figures 6 and 7 show a conventional damper type bearing.
As an example, a journal bearing for a light-load, high-speed rotating machine is shown. As shown in both figures, an annular bearing inner cylinder 1 that is concentric with the annular bearing housing 3 and has a smaller diameter is disposed inside the annular bearing housing 3, and a diameter is provided between the bearing inner cylinder 1 and the bearing housing 3. A gap 2 in the direction is provided over the entire circumference. On both the left and right sides of this gap 2, an elastic body 5 which also serves as a sealing material and is in close contact with the bearing inner cylinder 1 and the bearing housing 3 is interposed over the entire circumference. An oil supply hole 4 penetrating through the bearing housing 3 and the bearing inner cylinder 1 is provided in the upper part thereof, and when lubricating oil is forcibly supplied from this oil supply hole 4 to fill the gap 2, this gap 2 An oil film will be formed on the surface. Due to the spueeze film effect of this oil film and the damping effect of the elastic body 5 itself, the radial vibration of the rotating shaft 10 rotatably supported by the bearing inner cylinder 1 is suppressed and damped.

<Problems to be solved by the invention> In the conventional damper type bearing described above, the lubricating oil filled in the gap 2 can be conducted between the bearing inner cylinder 1 and the bearing housing 3 over the entire circumference. Therefore, once cavitation occurs,
In some cases, this spreads around the entire circumference of the gap 2, reducing the diaphragm action and the damping effect. In view of the above-mentioned conventional technology, the present invention solves the above problems by dividing the radial gap formed between the bearing inner cylinder and the bearing housing into small parts, thereby preventing cavitation from occurring and spreading, and achieving stable squeezing. The purpose of the present invention is to provide a damper type bearing that ensures membrane action.

<Means for solving the problem> The structure of the damper type bearing of the present invention that achieves the above purpose completely eliminates the radial gap between the bearing inner cylinder and the bearing housing, which rotatably support the rotating shaft. In a damper type bearing which is provided around the circumference and is formed by filling the gap with lubricating oil to form an oil film, a plurality of grooves are provided on the outer circumferential surface of the bearing inner cylinder and/or the inner circumferential surface of the bearing housing that face each other. The groove is carved in the circumferential direction and the width direction, and an elastic body that also serves as a sealing material is housed in the groove to divide the gap into a plurality of parts.

<Function> An elastic body that also serves as a sealing material is housed in grooves carved in the circumferential direction and the width direction on the outer peripheral surface of the bearing inner cylinder and/or the inner peripheral surface of the bearing housing, which face each other, so that the bearing inner cylinder and If the radial gap formed between the bearing housing and the entire circumference is divided in the circumferential direction and the width direction, lubricating oil will not be able to conduct between the divided gaps. Even if cavitation occurs in the gap, it does not spread to other divided gaps, and the squeeze film effect of the oil film is stabilized.

<Example> Hereinafter, an example will be described with reference to FIGS. 1 to 5. Note that the same parts as those in the prior art described above are given the same numbers and detailed explanations are omitted.

As shown in FIGS. 1 and 2, the bearing inner cylinder 1
Ten grooves 6 are formed in the width direction on the outer peripheral surface of the bearing inner cylinder 1, and two circumferential grooves 8 are formed in the width direction on the outer peripheral surface of the bearing inner cylinder 1. The intersection of these grooves 6 and 8 is smoothly chamfered. These grooves 6, 8
Four portions surrounded by were selected, and an elastic body 5 (not shown in FIGS. 1 to 3) serving as a sealing material was housed so as to surround the portions, thereby dividing the gap 2 into a plurality of parts. Four oil supply ports 7 are provided in the bearing housing 3 for supplying lubricating oil to the gap 2 surrounded by the elastic body 5 and divided into four parts. The arrangement and number of the circumferential grooves 8 and the widthwise grooves 6 are not particularly limited, and for example, as shown in FIG. 3, there may be three circumferential grooves 8. Further, the manner in which the elastic body 5 is accommodated in the grooves 6 and 8 may be such that it can be sealed without leaking lubricating oil and the gap 2 can be divided into a plurality of parts, for example, as shown in FIGS. 4 and 5. The elastic body may be accommodated in the grooves 6 and 8 so as to form a closed loop, and there are no particular limitations on the arrangement and size of the elastic body. Further, in the embodiment shown in FIGS. 1 and 2, the grooves 6 and 8 are carved on the outer circumferential surface of the bearing inner cylinder 1, but the grooves are not limited to this. It may be engraved on the peripheral surface, or it may be engraved on any surface. Further, in the illustrated example, the bearing inner cylinder 1 and the bearing housing 3 are integral, but they may be of a split type.Also, although a cylindrical sliding bearing is illustrated as the bearing inner cylinder 1, the bearing inner cylinder 1 and the bearing housing 3 are integral. There is no limitation on the shape, and it may be either a sliding bearing or a rolling bearing. In addition, 9 in the figure is a rotation stopper.

In this embodiment having the above configuration, the oil supply holes 4, 7
The lubricating oil forcibly supplied from the elastic body 5 fills each gap 2 divided by the elastic body 5 to form an oil film, and the vibration of the rotating shaft 10 is damped by the squeezed film action, while the lubricating oil that exceeds the elastic body 5 Therefore, there is no possibility of conduction to other divided gaps 2. Therefore, even if cavitation occurs in any of the divided gaps 2, the cavitation will not spread to other divided gaps. In addition, by selecting the number of segments and the rigidity of the elastic body according to the bearing load and maintaining the bearing inner cylinder 1 at an optimal equilibrium point (eccentricity) with respect to the gap 2, the squeeze membrane effect is effective. It can also be demonstrated effectively.

<Effects of the invention> As explained in detail above, the damper type bearing of the invention prevents the diffusion of cavitation and ensures that the squeeze film action works stably, so it is possible to effectively damp vibrations. It is possible.

[Brief explanation of the drawing]

Figures 1 to 5 relate to embodiments of the present invention;
The figure is a front view of a damper type bearing, Figure 2 is a side view of the bearing inner cylinder, Figure 3 is a developed view of the bearing inner cylinder, and Figure 4 is an example of various elastic bodies accommodated in the grooves of the bearing inner cylinder. FIG. 5 is a conceptual diagram of FIG. 4, FIGS. 6 and 7 are related to conventional damper type bearings, and FIG. 6 is a conceptual diagram of FIG.
- line sectional view in the figure, Fig. 7 is - in Fig. 6
FIG. In the drawing, 1 is a bearing inner cylinder, 2 is a gap, 3 is a bearing housing, 4 and 7 are oil supply holes, 5 is an elastic body that also serves as a sealing material, 6 is a groove in the width direction, 8 is a groove in the circumferential direction, 9
is a rotation stopper, and 10 is a rotating shaft.

Claims (1)

[Scope of utility model registration request] In a damper type bearing, a radial gap is provided along the entire circumference between a bearing inner cylinder that rotatably supports a rotating shaft and a bearing housing, and the gap is filled with lubricating oil to form an oil film. A plurality of grooves are carved in the circumferential direction and the width direction on the outer circumferential surface of the bearing inner cylinder and/or the inner circumferential surface of the bearing housing, and an elastic body that also serves as a sealing material is housed in the groove. A damper type bearing characterized by having a gap divided into multiple parts.