CN205780305U - A kind of forced-floating floating-ring bearing - Google Patents

Abstract

A forced floating floating ring bearing, comprising an inner rotator, an outer rotator and a floating ring between the inner and outer rotators. Rolling elements with smaller diameters at both ends and larger diameters in the middle. The two small ends of the rolling elements are installed in U-shaped grooves or through holes. When the inner and outer revolving bodies rotate relative to each other, the small end of the rolling body rotates in the U-shaped groove or the through hole, and the diameter of the middle part of the rolling body is smaller than the width of the rolling body groove, so there is no friction between the middle part of the rolling body and the rolling body groove, Thereby prolonging the life of rolling elements. The diameter of the rolling body is slightly larger than the wall thickness of the floating ring, so it can roll between the cylindrical surfaces of the inner and outer rotating bodies after being deformed by force, so that the floating ring can rotate stably between the inner and outer rotating bodies. The utility model is suitable for rotating machines under various heavy-load conditions, and is especially suitable for oil drilling machines such as roller cone bits and the like that bear heavy loads and strong impacts.

Description

A Forced Floating Floating Ring Bearing

technical field

The utility model relates to a sliding bearing used in a rotary machine, in particular to a sliding bearing such as a cone bit used under high-speed, heavy-load and strong-impact working conditions.

Background technique

Bearings commonly used in existing machinery can be roughly divided into two categories: rolling bearings and sliding bearings. When the rolling bearing is running, the friction coefficient is small, the frictional heat generation rate is low, and it can withstand high speed, but because of the point or line contact between the friction pairs, it is not suitable for use under heavy load. Sliding bearings have a large load-bearing area and can withstand heavy loads and strong impacts. However, the friction coefficient of the bearing pair is large, and the frictional heat generation rate is high. Contact corrosion and gluing, the friction between sliding parts gradually increases, which in turn leads to bearing failure. Therefore, how to improve the lubrication conditions of sliding bearings and reduce the friction between bearings has always been a matter of concern to people.

The existing floating ring sliding bearing plays a certain role in improving the lubrication condition of the sliding bearing and reducing the friction between bearing pairs. However, the floating ring rotates under the drive of the comprehensive friction torque of the inner and outer bearing pairs, so the movement of the floating ring is generally in an unstable state. In the actual work of the bearing, the floating effect of the floating ring is affected by many factors, including manufacturing errors, bearing material properties, lubrication conditions, external load conditions, etc. Under the influence of various factors, the floating ring often not only cannot achieve the ideal motion state, sometimes even cannot float completely, thus failing to achieve the purpose of reducing friction and prolonging the life of the floating ring.

The Chinese patent "Floating Sleeve Bearing with Forced Floating Function" (ZL200910059837.2) proposes a new floating sleeve (floating ring) bearing technical solution. In this scheme, a number of rolling elements with a diameter slightly larger than the thickness of the floating sleeve are arranged on the floating sleeve, and the thrust generated by the rolling process of the rolling elements is used to force the floating sleeve to rotate. The advantages of this technical solution are obvious, but there are still room for improvement. The main problem is that the floating sleeve rotates under the push of the rolling element, and there is a relatively severe sliding friction between the rolling element and the floating sleeve, and the bearing surface of the rolling element and the surface that interacts with the floating sleeve are the same surface, if The wear of the diameter of the rolling element will lead to the reduction or even loss of the driving force of the rolling element, thereby reducing the floating ability of the floating sleeve and affecting the bearing performance.

Contents of the invention

The purpose of this utility model is to propose a forced floating floating ring bearing. The floating ring in this sliding bearing can maintain a relatively stable floating state for a long time during work, reduce the relative sliding speed of the sliding friction pair of the bearing, and reduce the wear and prolong bearing life.

In order to achieve the above object, the utility model adopts the following technical solutions:

A forced floating floating ring bearing includes: an inner rotator, an outer rotator, and a floating ring between the inner and outer rotators. The utility model is characterized in that: a radially penetrating rolling element groove is opened on the cylindrical surface of the floating ring 3 4. The axial ends of the rolling body groove 4 are provided with U-shaped grooves 6 or axial support holes 7; the diameters at both ends of the rolling body 5 are smaller, and the middle diameter is larger, and the maximum diameter of the middle part of the rolling body 5 is smaller than that of the rolling body groove The circumferential width of 4; the rolling body 5 is installed in the rolling body groove 4, and the two small ends of the rolling body 5 are installed in the U-shaped groove 6 or the supporting hole 7 at both ends of the rolling body groove 4; the maximum diameter of the middle part of the rolling body 5 It is equal to or slightly larger than the wall thickness of the floating ring 3 .

There are one or more floating rings, and when multiple floating rings are used, the floating rings are arranged side by side on the shaft.

The inner rotator can be an inner ring or a shaft or other supports, and the outer rotator can be an outer ring or a disc wheel or other supports. When the inner and outer revolving bodies rotate relatively, the small end of the rolling body rotates in the U-shaped groove or the through hole, and the diameter of the middle part of the rolling body is smaller than the circumferential width of the rolling body groove, so there is no gap between the middle part of the rolling body and the rolling body groove Friction, thereby prolonging the life of rolling elements. Since the diameter of the rolling body is equal to or slightly larger than the wall thickness of the floating ring, the rolling body deformed by force rolls between the inner and outer rotating body cylinders, and at the same time pushes the floating ring to force it to slide, making the floating ring relative to the inner, The outer rotary body rotates stably to achieve the purpose of "forced floating", thereby reducing the wear of the bearing pair and prolonging the service life of the bearing.

The utility model has the advantages of:

(1) When the inner and outer revolving bodies rotate relatively, the small end of the rolling body rotates in the U-shaped groove or through hole, and the diameter of the middle part of the rolling body is smaller than the circumferential width of the rolling body groove, so the middle part of the rolling body and the rolling body groove There is no friction between them, thereby prolonging the life of the rolling elements, which is conducive to maintaining the "forced floating" effect for a long time and improving the working performance of the bearing.

(2) It is conducive to realizing the stable rotation of the floating ring, effectively reducing the relative speed, reducing the wear of the bearing pair, and prolonging the service life of the bearing.

(3) The floating ability of the floating ring is less affected by the manufacturing error of the bearing pair, material properties, lubrication state and other factors, so it has a longer service life under high speed and heavy load.

Description of drawings

Fig. 1 is the axial sectional schematic view of the utility model;

Fig. 2 is A-A sectional view of Fig. 1;

Fig. 3 is the left view of Fig. 1;

Fig. 4 is a schematic diagram of a floating ring in which U-shaped grooves are opened at both ends of the rolling body groove and the U-shaped opening points to the outside of the floating ring.

Fig. 5 is a schematic diagram of a floating ring in which U-shaped grooves are opened at both ends of the rolling body groove and the U-shaped opening points to the inside of the floating ring.

Fig. 6 is a schematic diagram of a floating ring with radially penetrating rectangular grooves at both ends of the rolling element grooves.

Fig. 7 is a schematic diagram of a floating ring with axial support holes opened at both ends of the rolling element groove.

Fig. 8 is a schematic diagram of rolling elements with smaller diameters at both ends and larger diameters in the middle.

Fig. 9 is a schematic diagram of a combined rolling body formed by a mandrel with a smaller diameter and a sleeve.

Fig. 10 is a schematic diagram of a combined rolling element formed by a mandrel with a small diameter and a sleeve, and the sleeve is a helical elastic roller.

Fig. 11 is a schematic diagram of a floating ring using a group of rolling elements in the present invention.

Fig. 12 is a schematic diagram of the utility model in which two floating rings are axially arranged side by side and share a set of rolling elements.

Figure 13 is a schematic diagram of the utility model in which three floating rings are axially arranged side by side and share two sets of rolling elements.

Fig. 14 is a schematic diagram of the utility model adopting three floating rings arranged axially side by side and sharing a set of rolling elements.

Fig. 15 is a schematic diagram of the utility model adopting one floating ring and using two sets of rolling elements.

Fig. 16 is a schematic diagram of the utility model adopting one floating ring and using three sets of rolling elements.

detailed description

As shown in Figures 1-3, a forced floating floating ring bearing includes an outer rotator 1, an inner rotator 2, and a floating ring 3 between the inner and outer rotators. The utility model is characterized by: There is a radially penetrating rolling body groove 4 on the cylindrical surface, and U-shaped grooves are provided at both axial ends of the rolling body groove 4; rolling body 5 is installed in the rolling body groove 4, and the diameter of both ends of the rolling body 5 is small. The middle diameter is larger. The two small ends of the rolling body 5 are installed in the U-shaped groove 6 or the through hole 7 at both ends of the rolling body groove 4; the middle part of the rolling body 5 is installed in the rolling body groove 4, and the diameter is equal to or slightly larger than the wall of the floating ring 3 Thick, less than the circumferential width of the rolling element groove 4.

As shown in Figures 4-6, U-shaped grooves 6 can be used at both ends of the rolling body groove 4 of the floating ring 3, and the U-shaped mouth can point to the inside or outside of the floating ring 3; The side wall can be connected or not connected.

As shown in FIG. 7 , the two ends of the rolling element groove 4 of the floating ring 3 may adopt the form of through holes 7 .

As shown in FIG. 8 , the rolling element 5 can be a roller with a smaller diameter at both ends and a larger diameter in the middle. The part with a larger middle diameter can also be drum-shaped.

As shown in Figure 9 and Figure 10, the rolling element 5 is a combined rolling element assembled from a mandrel (8) and a sleeve (9), and the sleeve 9 can be a hollow roller or a spiral elastic roller.

Figure 11 is an example of a floating ring using a set of rolling elements.

Two or more floating rings 3 can be arranged axially side by side. When the floating rings 3 are arranged side by side, the rolling body groove 4 may be divided into two parts, and the two parts are aligned in the circumferential direction during installation; a set of bosses 10 are processed on one of the floating rings, and a set of bosses 10 are processed on the corresponding floating ring. There is a group of notches 11, so that the bosses 10 and the notches 11 fit together, which can strengthen the synchronous rotation between the floating rings and prevent the rolling elements from being subjected to circumferential shear force. Figure 12 is an example where two floating rings are arranged axially side by side and share a set of rolling elements. Figure 13 is an example where three floating rings are arranged axially side by side and share two sets of rolling elements. Fig. 14 is an example where three floating rings are arranged axially side by side, and the three floating rings share a set of rolling elements.

One floating ring 3 can use two or more sets of rolling elements 4, wherein the adjacent two sets of rolling elements are alternately arranged. Figure 15 is an example of a floating ring using two sets of rolling elements, and Figure 16 is an example of a floating ring using three sets of rolling elements.

Claims (3)

1. A forced floating floating ring bearing, comprising an outer rotor (1) and an inner rotor (2), and a floating ring (3) between the inner and outer rotors, characterized in that: on the cylindrical surface of the floating ring (3) There is a radially penetrating rolling body groove (4), and the axial ends of the rolling body groove (4) are provided with U-shaped grooves (6) or through holes (7); the diameter of both ends of the rolling body (5) is small , the middle diameter is larger, and the maximum diameter of the middle part of the rolling body (5) is smaller than the circumferential width of the rolling body groove (4); the rolling body (5) is installed in the rolling body groove (4), and the two rolling body (5) The small end is installed in the U-shaped groove (6) or the through hole (7) at both ends of the rolling body groove (4); the maximum diameter of the middle part of the rolling body (5) is equal to or slightly larger than the wall thickness of the floating ring (3). 2. The floating ring bearing according to claim 1, characterized in that: the shape of the middle part of the rolling element (5) is cylindrical or drum-shaped. 3. The floating ring bearing according to claim 1 or 2, characterized in that the rolling element (5) is a combined rolling element assembled from a mandrel (8) and a sleeve (9).