CN211370294U

CN211370294U - Cone roller locked roller bit

Info

Publication number: CN211370294U
Application number: CN201921223930.8U
Authority: CN
Inventors: 刘振伟
Original assignee: Tianjin Lilin Bit Co ltd
Current assignee: Tianjin Lilin Bit Co ltd
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2020-08-28
Anticipated expiration: 2029-07-31

Abstract

The utility model relates to a drill bit technical field especially relates to a roller bit of tapered roller locking. The cone bearing assembly comprises a cone and a cone leg bearing, wherein a raceway space is arranged at a corresponding position between the cone and the cone leg bearing, and a tapered roller is arranged in the raceway space. The utility model discloses a tapered roller and cone bit leg are all line contact, also are line contact between the tapered roller moreover. Therefore, the bearing capacity of the roller cone is increased during working compared with that of a steel ball, the abrasion is small, and the risk of falling of the roller cone into a well can be greatly reduced.

Description

Cone roller locked roller bit

Technical Field

The utility model relates to a drill bit technical field especially relates to a roller bit of tapered roller locking.

Background

At present, a roller cone is locked on a tooth leg by a steel ball during manufacturing of the roller cone bit, and in actual use, the steel ball is abraded and accelerated after a bearing of the roller cone bit fails. The risk that the roller cone falls to the bottom of the well is caused, once the roller cone falls into the well, the fishing is difficult, the time for pulling out and fishing is increased, the well can be filled, and the great drilling cost is increased. The Chinese patent discloses a roller bit with a brand new structure, which has the following application numbers: 201410031377.3 which discloses a roller cone with a cone base attached to the roller cone with two tapered roller bearings, the bearings are very poorly sealed downhole and are prone to contamination resulting in premature failure of the bearings.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the not enough of above-mentioned technique, and provide a roller bit of tapered roller locking.

The utility model discloses a realize above-mentioned purpose, adopt following technical scheme: a tapered roller locking roller bit is characterized in that: the cone bearing assembly comprises a cone and a cone leg bearing, wherein a raceway space is arranged at a corresponding position between the cone and the cone leg bearing, and a tapered roller is arranged in the raceway space.

Preferably, the tapered roller has a circular truncated cone shape.

Preferably, the bottom surface and the side surface of the tapered roller are in contact fit with the raceway grooves on the cone leg bearing, the top surface and the side surface of the tapered roller are in contact fit with the raceway grooves on the cone, and the raceway grooves on the cone leg bearing and the raceway grooves on the cone form the raceway space.

Compared with the prior art, the utility model has the advantages that the tapered rollers are in line contact with the cone bit leg, and the tapered rollers are in line contact with each other. Therefore, the bearing capacity of the roller cone is increased during working compared with that of a steel ball, the abrasion is small, and the risk of falling of the roller cone into a well can be greatly reduced.

Drawings

FIG. 1 is a schematic structural diagram of a roller bit locked by a steel ball;

FIG. 2 is a schematic structural view of a roller bit locked by tapered rollers of the utility model;

FIG. 3 is a schematic view of a roller position structure of the utility model when the tapered roller is locked;

FIG. 4 is a schematic view of the installation of the tapered roller of the utility model;

FIG. 5 is a schematic structural diagram of the tapered roller distribution of the utility model;

fig. 6 is a schematic structural view of the utility model plug pin after being assembled.

Detailed Description

The following detailed description of the preferred embodiments of the present invention is provided in connection with the accompanying drawings. As shown in fig. 2 and 3, a roller cone bit locked by a tapered roller comprises a roller cone 1 and a bit leg bearing 2, wherein a raceway space 3 is arranged at a corresponding position between the roller cone and the bit leg bearing, and a tapered roller 4 is arranged in the raceway space. The tapered roller is in a circular truncated cone shape. And (3) loading the required number of tapered rollers from the plug pin hole, then placing a special plug pin, and then fully welding the plug pin hole. The rest parts are assembled in the same way as the conventional roller bit. The bottom surface and the side surface of the tapered roller are in contact fit with the raceway groove on the cone leg bearing, the top surface and the side surface of the tapered roller are in contact fit with the raceway groove on the cone, and the raceway groove on the cone leg bearing and the raceway groove on the cone form the raceway space.

The assembly method is as follows: and installing the cone with the sealing ring on the cone leg bearing. And then, the tapered roller is loaded from the plug pin hole, and the cone is rotated while being loaded until the raceway space of the cone and the cone leg is filled with the tapered roller. And (4) placing the plug pin into the plug pin hole in the direction, and fully welding the taper hole part of the plug pin hole after the plug pin is placed.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A tapered roller locking roller bit is characterized in that: the cone bearing assembly comprises a cone and a cone leg bearing, wherein a raceway space is arranged at a corresponding position between the cone and the cone leg bearing, and a tapered roller is arranged in the raceway space; the tapered roller is in a circular truncated cone shape; the bottom surface and the side surface of the tapered roller are in contact fit with the raceway groove on the cone leg bearing, the top surface and the side surface of the tapered roller are in contact fit with the raceway groove on the cone, and the raceway groove on the cone leg bearing and the raceway groove on the cone form the raceway space.