JPH053640U - Spherical plain bearing made of ceramics - Google Patents

Abstract

(57) [Summary] [Purpose] To extend the life of the bearing. Allows use under high loads. [Constitution] Fitted around the outer sliding ring (2) attached to the housing (H) and having the concave spherical surface (2a) formed on the inner peripheral surface, and the shaft (S) supported by the housing (H). And inner sliding ring (3) with a convex spherical surface (3a) formed on the outer peripheral surface
And a lubricating ring (4) made of a solid lubricating material and arranged on both sides of the outer sliding ring (2) in the axial direction. A concave spherical surface (4a) which is in sliding contact with the convex spherical surface (3a) of the inner sliding ring (3) is formed on the inner peripheral surface of the lubricating ring (4).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  This invention is, for example, a ceramic spherical plain bearing used in a high temperature atmosphere. Regarding

[0002]

[Prior art]

  For example, as a ceramic spherical plain bearing used in high temperature atmosphere, A ceramic that is attached to the housing and has a contact surface consisting of a concave spherical surface on the inner peripheral surface. Fitted around the mix outer slide ring and shaft supported by the housing, Ceramic inner slide ring with a convex spherical contact surface on its outer surface It is known that the two contact surfaces contact each other. For example, JP-A-60-205011).

When the above spherical plain bearing is used in a high temperature atmosphere, liquid lubricants such as grease and oil cannot be used. Therefore, graphite, MoS ₂ and polytetrafluoro are formed on the contact surfaces of the inner and outer sliding rings. It is coated with a solid lubricant such as ethylene.

[0004]

[Problems to be solved by the device]

  However, the coating film of the solid lubricant as described above is easily peeled off, Also, since it is not possible to replenish the lubricant during use to form a coating film, There was a problem that the bearing became unusable in a short period of time. Especially under high load The peeling of the coating film is remarkable, and it cannot be used under such conditions. won.

[0005]   The purpose of this invention is to provide a ceramic spherical plain bearing that solves the above problems. To do.

[0006]

[Means for Solving the Problems]

  The ceramic spherical plain bearing according to this invention is   A spherical sliding shaft interposed between the housing and a shaft supported by the housing A contact surface that is attached to the housing and has a concave spherical surface on the inner peripheral surface. The formed ceramic outer sliding ring and the outer peripheral surface that is fitted around the shaft The inner sliding ring made of ceramics with a contact surface consisting of a convex spherical surface A ceramic spherical plain bearing in which both contact surfaces are in contact with each other. Be careful   Lubricating rings made of solid lubricating material are arranged on both axial sides of the outer sliding ring. , A concave spherical surface is formed on the inner peripheral surface of the lubrication ring that makes sliding contact with the contact surface of the inner sliding ring. It is what has been.

[0007]   In the above ceramic spherical plain bearing, the lubricating ring is a ring with a crack. And urges the lubricating ring radially inward between the housing and the lubricating ring. Means are preferably provided. By doing this, the inner peripheral surface of the lubrication ring If the inner ring surface of the lubrication ring is in contact with the contact surface of the inner sliding ring, Because it can be touched.

[0008]

[Action]

  Lubricating rings made of solid lubricating material are arranged on both axial sides of the outer sliding ring. , A concave spherical surface that is in sliding contact with the contact surface of the inner sliding ring is formed on the inner peripheral surface of the lubricating ring. The inner ring is tilted with respect to the outer ring, the lubrication phosphorus The lubricant of the lubricating material that forms the glue is transferred to the contact surface of the inner sliding ring and solid lubricant A film is formed, which provides lubrication between the two sliding rings. Therefore, No need to coat with body lubricant, of course there is no risk of peeling . Also, during use, solid lubricant will automatically and continuously contact the inner sliding ring contact surface. Is replenished, so that the lubricating performance is maintained for a long time.

[0009]

【Example】   An embodiment of the present invention will be described below with reference to the drawings.

[0010]   As shown in Fig. 1, the spherical plain bearing (1) has a housing (H) and a housing (H). It is interposed between the shaft (S) and is mounted on the housing (H). Ceramic outer sliding ring (2) and ceramic fitted around the shaft (S) It consists of an inner sliding ring made of stainless steel (3). The axial length of the inner sliding ring (3) is It is longer than the axial length of the side sliding ring (2). Of the outer sliding ring (2) A concave spherical surface (contact surface) (2a) is formed on the inner peripheral surface. Outer circumference of inner sliding ring (3) The surface has a convex spherical surface (contact surface) (3a) that contacts the concave spherical surface (2a) of the outer sliding ring (2). Is made. Although not shown, due to the assembly, the outer sliding ring (2) has a groove Is formed, or one of the rings (2) (3) is split in two. It

Lubricating rings (4) made of a solid lubricating material such as graphite or MoS ₂ are fitted around the inner sliding ring (3) on both sides of the outer sliding ring (2). A concave spherical surface (4a) capable of sliding contact with the convex spherical surface (3a) of the inner sliding ring (3) is formed on the inner peripheral surface of the lubricating ring (4). The concave spherical surface (4a) is on the same spherical surface as the convex spherical surface (3a) of the inner sliding ring (3). The axial length of both the inner and outer sliding rings (2) (3) and the lubrication ring (4) depends on the inner sliding ring (3) tilting relative to the outer sliding ring (2) and the inner sliding ring. The length is preferably such that the lubricant of the lubricating ring (4) is transferred to the entire convex spherical surface (3a) of the ring (3) to form a lubricant film.

[0012]   The lubrication ring (4) is a split ring, and the lubrication ring (4) and housing (H) The compression coil spring (5) that biases the lubrication ring (4) radially inward A plurality of them are arranged at intervals in the direction.

[0013]   When this bearing (1) is used, the convex spherical surface (3a) of the inner sliding ring (3) is Solid lubrication that forms the lubrication ring (4) by sliding contact with the concave spherical surface (4a) of (4). The solid lubricant of the material is transferred to the convex spherical surface (3a) of the inner sliding ring (3) and wets its surface. A lubricant film is formed and transferred to the concave spherical surface (2a) of the outer sliding ring (2). A lubricant film is formed on the surface. Therefore, the lubricant films should be in sliding contact with each other. Therefore, both rings (2) and (3) slide smoothly due to the action of these lubricant films. That conclusion As a result, wear of both sliding rings (2) (3) is reduced. Also, when using the solid lubricant Automatically and continuously the convex spherical surface (3a) of the inner sliding ring (2) and the outer sliding ring Since it is replenished to the concave spherical surface (2a) of (3), lubricating performance is maintained for a long period of time. . Furthermore, if wear occurs on the concave spherical surface (4a) of the lubrication ring (4), the action of the spring (5) Press the lubrication ring (4) radially inward and push it against the inner sliding ring (3). Attached. Therefore, the lubrication performance of the lubrication ring (4) is maintained.

[0014]

[Effect of device]

  According to the spherical plain bearing device of the present invention, as described above, the solid lubricant is used during use. Lubricant is automatically and continuously replenished to the contact surface of the inner sliding ring for long periods of time. Lubrication performance is maintained throughout. Therefore, the life of the bearing is extended. Moreover, Since it is not necessary to use a solid lubricant for coating unlike the conventional method, Can be used in.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a spherical plain bearing of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

[Explanation of symbols]

1 Spherical plain bearing 2 Ceramic outer sliding ring 2a concave spherical surface (contact surface) 3 Ceramic inner sliding ring 3a Convex spherical surface (contact surface) 4 Lubrication ring 4a concave spherical surface H housing S axis

Claims (2)

[Scope of utility model registration request] 1. A spherical plain bearing interposed between a housing and a shaft supported by the housing, wherein the spherical outer bearing is mounted on the housing and has a contact surface formed of a concave spherical surface on an inner peripheral surface thereof. Made of ceramics, which consist of a sliding ring and a ceramic inner sliding ring that is fitted around the shaft and has a contact surface consisting of a convex spherical surface on the outer peripheral surface, so that both contact surfaces contact each other. In spherical plain bearings, lubricating rings made of a solid lubricating material are arranged on both sides of the outer sliding ring in the axial direction, and a concave spherical surface that makes sliding contact with the contact surface of the inner sliding ring is formed on the inner peripheral surface of the lubricating ring. Spherical plain bearing made of ceramics. 2. The lubricating ring is a split ring,
2. The ceramic spherical plain bearing according to claim 1, wherein means for urging the lubricating ring inward in the radial direction is provided between the housing and the lubricating ring.