JPH0596545U - Spherical bearing - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the formation of oil film by ensuring that the lubricating oil supplied from the outside spreads over the entire width of the sliding surface. [Structure] The inner ring 1 and the outer ring 2 are spherical sliding surfaces 1
a and 2a contact each other. On the sliding surface 2a of the outer ring 2,
A spiral oil groove 3 having both ends opened to the width surface is provided. Oil groove 3
May be provided on the sliding surface 1a of the inner ring 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an oil-supplied spherical bearing that makes sliding contact on a spherical surface.

[0002]

[Prior Art]

 The performance of spherical bearings used in general industrial machines depends on the quality of lubrication on their sliding surfaces. In the oil-supplied spherical bearing, an oil groove as shown in FIGS. 4A and 4B may be provided in the inner ring in order to assist lubrication of the sliding surface.

In the example of FIG. 4 (A), an oil groove 43 composed of a circumferential groove 43 a and a plurality of partial arc grooves 43 b in the center portion in the width direction is formed on a spherical sliding surface of the inner ring 41 that contacts the outer ring 42. Is formed. Reference numeral 44 indicates a shaft fixed to the inner ring. In the example of FIG. 4B, the oil groove 45 including a plurality of circumferential grooves 45a having different angles is provided on the sliding surface of the inner ring 41. By providing the oil grooves 43 and 45 in this manner, the amount of lubricating oil retained between the inner and outer races 41 and 42 increases, which is advantageous for forming an oil film.

[0004]

[Problems to be solved by the device]

 However, in the examples of FIGS. 4 (A) and 4 (B), the oil grooves 43 and 45 do not reach the width surface of the outer ring 42 and are formed only in the middle portion of the sliding surface, so that lubrication from the outside is not performed. Even if you try to replenish the oil, it may be difficult to enter, and the entire sliding surface may not be spread. In particular, when the shaft 44 is used in a vertical orientation, it is difficult for the lubricating oil to enter, and the oil film may run out, resulting in metal contact.

An object of the present invention is to provide a spherical bearing capable of ensuring that lubricating oil supplied from the outside is spread over the entire width of the sliding surface.

[0006]

Means for Solving the Problems In the spherical bearing of the present invention, a spiral oil groove whose both ends open to the width surface of the inner ring or the outer ring is provided on at least one sliding surface of the inner ring or the outer ring. The sliding surface is a surface where the inner ring and the outer ring are in contact with each other and is formed in a spherical shape.

[0007]

[Action]

 When the lubricating oil is supplied at the end portion in the axial direction, the lubricating oil flows into the spiral oil groove opened on the width surface and flows to the other end side. Therefore, the lubricating oil supplied at the edges spreads over the entire width of the sliding surface.

[0008]

【Example】

 An embodiment of this invention will be described with reference to FIG. This spherical bearing is composed of an inner ring 1 and an outer ring 2 which are in contact with each other at spherical sliding surfaces 1a and 2a, and a spiral oil groove 3 is formed on a sliding surface 2a of an outer ring 2. Both ends of the oil groove 3 are open to the width surface 2b of the outer ring 2. The shaft 4 is fitted and fixed in the inner diameter hole 1c of the inner ring 1.

According to this bearing, for example, when the shaft 4 is used in a vertical orientation, refueling is performed as follows. That is, the lubricating oil is dripped from above onto the sliding surface 1a portion exposed from the outer ring 2 of the inner ring 1. The dropped lubricating oil flows into the oil groove 3 of the outer ring 2 through the opening of the width surface, and gradually flows out to the lower side. The time for the lubricating oil to pass through the oil groove 3 differs depending on the spiral lead angle of the oil groove 3, the cross-sectional shape of the oil groove 3, the viscosity of the lubricating oil, and the like. Therefore, by appropriately designing the lead angle and the sectional shape according to the lubricating oil used, the lubricating oil can be stored in the oil groove 3 for a necessary time.

In this way, the lubricating oil can be supplied from the outside into the oil groove 3, and the lubricating oil can be surely spread over the entire width of the sliding surfaces 1a, 2a of the inner and outer rings 1, 2. Therefore, the oil film formation is improved.

FIG. 2 shows another embodiment. In this example, the depth of each circumferential portion of the oil groove 3 is gradually changed so that the central portion of the outer ring 2 in the axial direction becomes the deepest. The chain line a is a bottom position change curve showing the bottom position of each orbiting portion of the oil groove 3. When the oil groove 3 is formed in this manner, the lubricating oil is most likely to be collected in the axial center portion of the outer ring 2. Other constitutional effects are similar to those of the above-mentioned embodiment.

FIG. 3 shows another embodiment. In this example, the oil groove 5 is formed in a spiral shape on the sliding surface 1a of the inner ring 1. Both ends of the oil groove 5 are opened to the width surface 1b of the inner ring 1. Even when the oil groove 5 is provided on the inner ring 1 side as described above, it is possible to supply the lubricating oil from the outside and spread it over the entire sliding surfaces 1a and 2a as in the above-described embodiment. Note that, in the example of FIG. 3, both ends of the oil groove 5 may be located outside the width surface 2b of the outer ring 2.

[0013]

[Effect of the device]

 In the spherical bearing of the present invention, the spiral oil groove whose both ends are opened to the width surface is provided on the sliding surface of the inner ring or the outer ring. It flows in from the opening and flows to the other end side. Therefore, the supplied lubricating oil can be reliably spread over the entire sliding surface, and the oil film can be prevented from running out.

[Brief description of drawings]

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

FIG. 2 is a sectional view of another embodiment of the present invention.

FIG. 3 is a sectional view of still another embodiment of the present invention.

4A and 4B are cross-sectional views showing a conventional example.

[Explanation of symbols]

1 ... Inner ring, 1a ... Sliding surface, 2 ... Outer ring, 2a ... Sliding surface, 3
… Oil ditches

Claims (1)

[Scope of utility model registration request] 1. A spherical bearing in which at least one sliding surface of an inner ring and an outer ring that are in contact with each other at a spherical sliding surface is provided with a spiral oil groove whose both ends open to the width surface of the inner ring or the outer ring.