JPS62106122A - Contrarotating bearing - Google Patents

Abstract

PURPOSE:To prevent seizing and abnormal abrasion from taking place by forming the internal periphery surface of a bearing into an expansion configuration composed of a series of pedestal shape which combines straight lines with curves, and then specifying the ratio of the gentle slope to the steep slope length in the internal periphery arcs. CONSTITUTION:The internal configuration of a bearing 1 is composed of a combination of arcs of the three kinds: the A portion of arc of radius r2 with center at the point Q being eccentric by delta from the bearing center O, the B portion of arc of radius r3 with center at the point P being eccentric by xsi from the bearing center O, and the C portion of arc of radius r1 with center at the bearing center O. In addition, the ratio of the A portion to the B portion is made to A : B = 6 : 4 - 9 : 1, and a shaft is held in the bearing 1 by means of a lubricant, such as oil, water and the like. Hereupon, the shaft and the bearing 1 are caused to rotate in the opposite direction to each other, and, when the rotating speed of the two comes near, at the A portion, and when the shaft is in the rotation to the right, at the B portion, is generated a load capacity respectively. Thereby, the shaft can be prevented from coming in contact with the bearing 1, and accordingly, seizing and abnormal abrasion can also be prevented from taking place.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is directed to a shaft and a bearing such as a stern tube bearing of a ship. This relates to reversible bearings that rotate in opposite directions.

BACKGROUND ART] FIG. 3 is an example of a conventional sliding bearing and is an explanatory diagram of its operation.

From FIG. 3, the inner surface of the slide bearing 01 is a perfect circle centered on the point O, and a shaft 02 centered on the point O' is inserted into the slide bearing 01 through a lubricant 03 such as oil and water. Existing.

The effect is that when the shaft 02 rotates at a speed U inside the bearing 01, an oil film is formed between the bearing 01 and 1iQIIO2, and due to this effect, a pressure distribution as shown in Figure 3 is generated. . Since the bearing 11mb 02 is supported by this oil film, it is in a so-called lubricated state with the bearing 01 and does not come into direct contact with the bearing 01, thereby preventing seizure or abnormal wear.

[Problems to be Solved by the Invention] However, as in the bearing of a counter-rotating propeller, when the single shaft and the @l+ bearing rotate in opposite directions, and the angles of the two sides are approximately equal to 7, the oil film is There is a disadvantage that the pressure decreases (7) and the load capacity of the 1st station is reduced.

The present invention is aimed at solving the above-mentioned drawbacks, and the inner surface of the bearing is not completely circular, but has a cross section t that is a combination of curved lines and straight lines.
The aim is to provide an inverted 11al+ receiver that has a ri+ shape.

[Means for solving problems]

For this reason, the reversing bearing of the present invention is a journal bearing in which the bearing and the dat+ installed inside the bearing via lubricating oil rotate in opposite directions, and the inner circumferential surface of the bearing is divided into two pieces (circumferentially). , the developed shape is a kind of continuous trapezoid that combines curves and straight lines, and the ratio of the inner circumferential arc length of the gentle slope to the inner circumferential arc length of the steep slope is 6:4 to 9:1. It is a feature.

[Function] With the above configuration, the rotational speeds of the bearing and the shaft rotating in the opposite direction to the bearing approach the same speed.

Embodiment] FIGS. 1 and 2 show an embodiment of a reversing bearing according to the present invention. FIG. A partially exploded view of the bearing is shown. From Fig. 1, the inner shape of the bearing 1 consists of a combination of three types of circular arcs (mostly two types), and the circular arc of part A is:
Radius centered at a point Q that is eccentric by δ from the bearing center O [
2, and the arc of part B is from the bearing center ○ to ξ
It is a part of a circle whose center is a point P which is eccentric by a distance and whose radius is [3]. The 0 section connecting the A section and the B section is a part of a circle having a radius r1 centered on the bearing center O.

The ratio of part A to part B is 6:4 to 9:1. The shaft (2) is located inside the bearing 1 with a lubricant 3 such as oil or water interposed therebetween.

This action occurs when bearing 1 (velocity U) and support 2 (upper seat U') rotate in opposite directions to each other in the direction shown by the arrow in the developed view of Fig. 2, and when velocity U and velocity U' approach each other, However, due to the squeezing action of the oil film in part A, pressure is generated and load capacity is increased. Further, when the bearing 1 and the shaft 2 rotate in the direction opposite to the arrow shown in FIG. 2, a load capacity is generated at the B portion.

In the other embodiments and 1-, the shapes of portions A and B shown in FIGS. 1 and 2 were part of circular arcs, but each shape is a straight line or a curved line. In other words, the combination of shapes of parts A and B is part A/' part B - straight line/straight line, curve/curve, straight line/'
Straight lines, curved lines/straight lines are possible. Its action and effect are the same as above.

[Effects of the Invention] As described above, the bearing (velocity U) and the shaft (velocity u') rotate in opposite directions to each other in the directions shown in FIG.
Even when the motor approaches 17, pressure is generated due to the squeezing action of the oil film in part A (or part B if rotating in the opposite direction to that in Fig. 2), and a load capacity is generated. Therefore, it is possible to prevent contact between the shaft and the bearing, which has the effect of preventing seizure and abnormal wear.

[Brief explanation of drawings]

1 and 2 show an embodiment of the reversing bearing according to the present invention. FIG. 1 is a sectional view showing the inner surface shape of the 1IQb bearing according to the present invention, and FIG. 2 is a portion of the bearing shown in FIG. 1. A developed view is shown. FIG. 3 is an example of a conventional sliding bearing and is an explanatory diagram of its operation. 1-fJt reception, 2-4QI+, 3-c4m agent Figure 1, Country 2

Claims (1)

[Claims] In journal bearings in which a bearing and a shaft installed inside the bearing through lubricating oil rotate in opposite directions, the inner peripheral surface of the bearing is divided into multiple parts on the circumference, and the developed shape is a combination of curved and straight lines. A reversing bearing characterized in that it has a continuous trapezoidal shape, and the ratio of the inner circumferential arc length of the gentle slope to the inner circumferential arc length of the steep slope is 6:4 to 9:1.