JPS6131208Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a spherical plain bearing.

BACKGROUND ART Conventionally, spherical plain bearings have been used under special operating conditions such as high surface pressure and high-speed rocking. A spherical plain bearing is composed of an outer ring and an inner ring, and the inner circumferential surface of the outer ring and the outer circumferential surface of the inner ring are both spherical.
Both, that is, the concave spherical surface of the outer ring and the convex spherical surface of the inner ring, serve as sliding surfaces, and these sliding surfaces are lubricated to ensure smooth sliding. As shown in FIG. 5, the outer peripheral surface of the inner ring is provided with an annular oil groove A that goes around the outer periphery and a plurality of circular grooves R that are connected to the oil groove A.

Problems to be Solved by the Invention In the case of the conventional example described above, although the lubrication effect was achieved, machining of the circular grooves took time, which was a problem.

Therefore, the purpose of this invention is to provide a spherical plain bearing in which oil grooves can be carved by simple machining using a lathe, end mill, etc., and which can maintain a lubricating function equivalent to or better than conventional bearings. .

Means for Solving the Problems The present invention is a spherical sliding bearing consisting of an outer ring having a concave spherical surface, and an inner ring having a convex spherical surface corresponding to the concave spherical surface and having an oil groove cut out on the convex spherical surface. 2 which intersect with the convex spherical surfaces of the inner ring, whose intersection is at the axial center of the inner ring, and which extend symmetrically from the intersection to both sides in the circumferential direction and both sides in the width direction.
A plurality of oil groove groups are arranged independently and spaced apart in the circumferential direction, each consisting of approximately linear oil grooves, and a communication hole that communicates the intersection of the oil grooves with the inner diameter hole of the inner ring. It is characterized by the end of the oil groove merging with the convex spherical surface of the inner ring.

Operation Lubricating oil supplied from the inner diameter hole side of the inner ring to the oil groove through the communication hole easily seeps out from the end of the oil groove and spreads between the sliding surfaces of the outer ring and the inner ring.

While maintaining a good lubrication function as described above, the oil grooves are generally linear and independent, so it can be installed very easily.

Example The embodiments shown in the drawings will be described below.

FIG. 1 shows the state in which the spherical outer peripheral surface (convex spherical surface) of the inner ring 1 of the spherical plain bearing is turned. In this case, the groove bottom of the oil groove 2 has a larger radius of curvature than the convex spherical surface of the inner ring 1, and is formed so that the depth of the groove is shallow at the machining start part and the machining end part, that is, the end of the groove, and the deepest in the center part. . FIG. 2 shows a state in which the convex spherical surface of the inner ring 1 is end-milled, and in this case, the groove bottom of the oil groove 3 extends parallel to a plane containing the axis of the inner ring 1. The oil groove 3 is formed so that the groove is shallow at the start and end of the process, that is, at the ends of the groove, and is deepest at the center, as in the case of machining with the lathe shown in FIG. In other words, the ends of the oil grooves 2 and 3 gently merge with the spherical outer peripheral surface of the inner ring. A plurality of oil groove groups, which are various combinations of the oil grooves 2 and 3 as described above, are arranged on the outer circumferential surface of the inner ring 1 so as to be spaced apart from each other in the circumferential direction of the inner ring.

In Fig. 3, two oil grooves 4 obliquely intersecting each other are formed by end milling on the spherical outer peripheral surface of the inner ring 1 at positions where the circumference is divided into an arbitrary number of equal parts (the illustrated example is a case of four equal parts). It has been done. An annular oil groove 5 carved on the inner peripheral surface of the inner ring 1 communicates with the oil groove 4 on the outer peripheral surface through a communication hole 6 bored at the intersection of the oil grooves 4, and lubrication is carried out through the oil groove on the inner peripheral surface. 5 through a communication hole 6 to an oil groove 4 on the outer peripheral surface, and the sliding surface is smoothly lubricated from the end of the oil groove 4.

In FIG. 4, two mutually orthogonal oil grooves 7 are formed by end milling at positions where the circumference of the spherical outer peripheral surface of the inner ring 1 is divided into four equal parts. The oil groove 5 carved on the inner circumferential surface of the inner ring 1 communicates with the oil groove 7 on the outer circumferential surface through a communication hole 6 bored at the intersection of the oil grooves 7, and lubrication is carried out through the oil groove 5 on the inner circumferential surface. The oil passes through the hole 6 and reaches an oil groove 7 on the outer peripheral surface, and the sliding surface is supplied with oil from the end of the oil groove 7.

In both the embodiments shown in FIGS. 3 and 4, oil groove groups each consisting of two generally linear oil grooves that intersect with each other are spaced apart from each other in the circumferential direction of the inner ring. , the individual oil grooves of each oil groove group are independent from the individual oil grooves of the adjacent oil groove group.

In addition to the oil grooves 4 and 7 shown in FIGS. 3 and 4 above, various oil grooves can be provided depending on the purpose of use.
That is, the diagonal oil groove 4 shown in FIG. 3 is combined with the orthogonal oil groove 7 shown in FIG. Alternatively, it may be provided with orthogonal oil grooves 7. However, if the annular oil groove is provided on the outer circumferential surface of the inner ring, the area of the sliding surface will be reduced, so it is more advantageous in this respect to provide the annular oil groove on the inner circumferential surface of the inner ring. Note that, as is commonly done, an annular groove or other means for lubricating may be provided on the shaft that fits into the bore hole of the inner ring 1.

Effects According to this invention, the oil groove can be easily machined by straight line machining using a lathe or end mill, and it can be processed in a wide range in the circumferential direction and the width direction for any operating angle of the inner and outer rings. It is possible to maintain uniform lubrication conditions over the entire surface of the sliding spherical surface during sliding contact. In addition, the number of oil grooves formed in the circumferential direction can be reduced, and since there are no oil grooves on the convex spherical surface of the inner ring intermediate between the intersecting oil grooves adjacent in the circumferential direction, the surface pressure is the lowest during use. It is possible to reduce the reduction in the sliding area of the center portion in the width direction of the bearing, which becomes higher, and it is possible to suppress a decrease in the load capacity of the bearing. In addition, by forming communication holes that communicate with the inner diameter holes of the inner ring at the intersections of the cross-shaped oil grooves, lubricating oil is supplied from the inner diameter hole side of the inner ring to the oil grooves through the communication holes in each cross-shaped oil groove. The oil can be evenly distributed all the way to the end of the groove. Furthermore, since the groove bottoms of the intersecting oil grooves are gently fused with the convex spherical surface of the inner ring toward the ends, the lubricating oil can more smoothly ooze out to the sliding surfaces, improving the lubrication function.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the spherical outer circumferential surface of the inner ring of the spherical plain bearing of this invention, with oil grooves provided by turning.
The figure is a cross-sectional view of the spherical outer circumferential surface of the inner ring of the spherical plain bearing of this invention, with oil grooves formed by end milling.
The figure is a partially cross-sectional side view of one embodiment of this invention in which diagonal oil grooves are carved, and Figure 4 is a partially cross-sectional side view of another embodiment of this invention in which orthogonal oil grooves are carved. FIG. Incidentally, FIG. 5 is an explanatory diagram of a known example. 1... Inner ring, 4, 7... Oil groove.

Claims (1)

[Claims for Utility Model Registration] (1) A spherical sliding bearing consisting of an outer ring having a concave spherical surface, and an inner ring having a convex spherical surface corresponding to the concave spherical surface, with an oil groove cut out on the convex spherical surface. hand,
Consisting of two generally linear oil grooves that intersect with each other on the convex spherical surface of the inner ring, the intersection thereof being at the axial center of the inner ring, and extending symmetrically from the intersection to both sides in the circumferential direction and both sides in the width direction. It has a plurality of oil groove groups arranged independently and spaced apart in the circumferential direction, and a communication hole that communicates the intersection of the oil grooves with the inner diameter hole of the inner ring, and the end of each oil groove forms a convex spherical surface of the inner ring. A spherical plain bearing characterized by being fused with (2) The spherical plain bearing according to claim 1, wherein the groove bottom of each oil groove is arcuate with a radius of curvature larger than that of the convex spherical surface of the inner ring. (3) The spherical plain bearing according to claim 1, wherein the groove bottom of each oil groove is linear parallel to a plane containing the axis of the inner ring.