SU1104232A1 - Rolling cutter bit bearing - Google Patents

Abstract

BORING BALL RING, containing a trunnion, a roller cutter, rolling bodies placed in the openings of the floating sleeve, so that, in order to increase the durability of the support, the matching surfaces of the trunnion, bushings and roller cones are made conical with taper angle 1, the value of which is determined from the relation O ft 90 - L, where} i is the angle of inclination of the axis of the roller cutter to the axis of the bit. SD 00

Description

The invention relates to the field of drilling oil and gas wells, namely to roller cone bits.

A well-known drill bit support containing a conical pin and mounted on it by means of conic rollers [ij.

The disadvantage of the support is the lack of cages, since full-complement rolling bearings of the support 10 of the bit are inferior in terms of durability to the sliding bearings.

Also known is the support of a rolling cone bit containing a pin, roller cone, rolling elements placed <5 in the holes of the floating sleeve [2J.

The disadvantages of the known bearings are the lack of a cage in the castle bearing and the increased axial load on the castle bearing. 20

The aim of the invention is to increase the durability of the support.

This goal is achieved by the fact that in the support of the drill bit containing a pin, a roller cutter, rolling elements25 placed in the holes of the floating sleeve, the mating surfaces of the pin, bush and roller cone are made conical with a cone angle p, the value of which is determined from the relation 0 ·· p * · 90 ~ οί, where & is the angle of inclination of the cone axis to the axis of the bit.

In FIG. 1 shows the support of a cone drill bit, section; in FIG. 2 vector triangle of forces acting on a support.

The support of the bit includes a trunnion trunnion pin 1 with a locking finger 2, the trunnion movably interacts with the floating sleeve 3 and the locking balls 4 located in the holes of the sleeve, which are movably interacting with roller cone 5. The bearing cavity is sealed by a sealing element 6 located at the base of the trunnion, and the top of the pin interacts with. persistent fifth 7 cones.

During operation of the bit, the axial (relative to the trunnion) part of the load is perceived by the persistent fifth 7 and locking balls 4. The rest of the load from the roller cutter 5 to the trunnion 1 is transmitted through the floating sleeve 3. As can be seen from FIG. 2, for the same roller load, the arithmetic sum of the axle loads in a support with a conical floating sleeve (R <+ S <) is less than in a support with a cylindrical floating sleeve (R ^ + Sp. Lock balls provide the necessary angular floating sleeve speed The floating sleeve for the lock bearing acts as a separator The thickness of the floating sleeve for a specific bit is taken into account the strength of the floating sleeve and the possibility of transferring the necessary axial load by the locking bearing in both directions.

The invention improves the efficiency of the support bit.

ВНИЙПИ Order 5174/21 Circulation 565 Subscription

Branch of the PPP Patent, Uzhgorod, Project 4,

Claims (1)

A DRILLING DRILLING BIT SUPPORT, comprising a pin, roller cutter, rolling elements located in the holes of the floating sleeve, characterized in that, in order to increase the durability of the support, the mating surfaces of the pin, sleeve and roller cutter are made conical with a taper angle β, the value of which is determined from the relation 0 <β <90 - L, where ρί is the angle of inclination of the cone axis to the axis of the bit. fig 1 (11)