RU2399743C1 - Plain thrust bearing of drill bit rolling cutters - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: sliding support of drill bit rolling cutters includes trunnion, intermediate sleeve between trunnion and surface of mounting bore of rolling cutter, thrust element made in the form of end projection and having intermediate loosely fitted washer. At that, three-layered packs soaked with standard lubricant are installed between contact surfaces of the end projection of trunnion and intermediate washer, as well as between surfaces of washer and rolling cutter: tracing paper - fluoroplastic film - tracing paper, the contact area of which is equal to the area of intermediate washers.

EFFECT: increasing efficiency of thrust bearing of drill bit rolling cutters.

1 dwg

Description

The invention relates to the field of technology used in drilling soil or rocks, and is intended to increase the load capacity of the support elements of sliding bearings in roller cone bits.

Known sliding bearings of cone drill bits - analogues [1, 2] and others, containing a ball lock, a loose fitting sleeve, a seal that seals the friction zone from external contamination, and a thrust bearing element made in the form of an end ledge on the axle interacting with the support the surface of the cone, perceiving the axial component of the load, through an intermediate freely sitting washer.

An example of such a solution is the support of the drill bit III-M3-GAU 190.5, in which the axial load is perceived by an end ledge made on a trunnion, as well as a flat end face of the centering spike.

The disadvantage of this design is the instability of the load distribution between the persistent shoulders of the trunnion and spike, depending on the accuracy of their linear dimensions.

In the device of a thrust bearing according to the patent of the Russian Federation No. 2068060 [3], to increase the working capacity of the bearings, freely sitting bushings and thrust washers are provided on the surface of which are formed spiral grooves filled with grease, which improves the lubricating mode of the radial and thrust bearing elements.

The disadvantage of this technical solution is to reduce the contact area of the supporting surface due to the formed grooves, which increases the specific load in the thrust bearing.

In addition, under the action of dynamic loads - vibrations and shocks, the axial support, even with an intermediate washer, remains rigid, its damping effect is insufficient, and the failure of the support is associated with gripping and scoring between the surfaces of the washer, the end surfaces of the spike and cone.

This patent is taken as a prototype.

The technical result is to increase the efficiency of the thrust bearing cone drill bits.

The technical result is achieved by the fact that in the sliding bearing cone of the drill bits containing the journal, the intermediate sleeve between the journal and the surface of the cone of the roller cone, a thrust element made in the form of an end ledge on the axle and having an intermediate freely sitting washer between the contacting surfaces of the end ledge of the axle, the intermediate washer, as well as between the surfaces of the washer and roller cone, install three-layer packages impregnated with standard grease: paper tracing paper - PTFE film - paper tracing paper, the contact area of which is equal to the area of the intermediate washers.

In the proposed solution (drawing), intermediate elements 5 are made in the joints between the cutter 2, the thrust washer 4, and also between the thrust washer and the bearing surface of the axle 1, made in the form of a package of plates made of F-4 fluoroplastic, separated by porous layers, for example, of paper tracing paper in accordance with GOST 2036-88, GOST - 24222-80.

Intermediate elements introduced into the working gap prevent metal contact, setting and seizures during breaks of the lubricating film, enhance the lubricating effect, prevent the lubricant from being squeezed out through the lateral gap and undesirable transfer of copper to steel surfaces from surfaces of freely sitting washers made of BrB2 bronze, and also provide an increase damping action of the support, which creates the total beneficial effect of the proposed invention.

The proposed invention is implemented as follows.

The rings made of F-4 fluoroplastic and tracing paper are greased with regular grease and form a bag: a F-4 fluoroplastic ring is placed between two paper rings, and the resulting three-layer bags 5 (Fig. 1) are installed on the stop end face of journal 1. On top of the bag, a stop the washer 4, on top of the washer - the second package 5.

A cone 2 is mounted on the support element thus formed, and grease is supplied to the lubricating clearances 3 under pressure.

When evaluating the efficiency of using damping packages in the thrust bearings of drill bits using the example of the R544 bit, the following was established:

1. The value of the maximum setting load during testing, for example, with Tomflon SBS-240 grease, increased from 75 to 350 kgf / cm ² , i.e. 4.7 times.

2. The temperature of self-heating for 1 hour of the test decreased by 10 ... 15%.

3. The friction coefficient decreased by 4 times.

Literature

1. Johansen K.V. Driller's satellite. Reference book: Johansen Konstantin Vladimirovich. - Ed. 3rd, rev. and add. - M: Nedra, 1990 .-- 302 p.

2. Kershenbaum V.Ya., Torgashov A.V., Wesser A.G. Drilling rock cutting tool. Volume 1. Roller cone bits. Int. reference translator. - M.: “Oil and gas”, 2003. - 254 p.

3. Pat. 2068069 of the Russian Federation, IPC ⁶ Е21В 10/22 Support of roller cone bit. / Seltzer P.Y .; applicant and patent holder East Siberian Research Institute of Geology, Geophysics and Mineral Resources. - No. 4936924/03; declared 05/15/91; publ. 10.20.96. - Bull. Number 22. - 5 p.: Ill.

4. GOST 20692-2003. Group G43. Interstate standard. Roller cone bits. TU ISS 75.180.10. OKP 36 6440. - Instead of GOST 20692-75.

Claims (1)

The sliding cone of the drill bits containing a pin, an intermediate sleeve between the pin and the surface of the cone of the cone, a stop element made in the form of an end ledge on the axle and having an intermediate freely sitting washer, characterized in that between the contacting surfaces of the end ledge of the axle, an intermediate washer, and between the surfaces of the washer and roller cone, three-layer packages impregnated with regular grease are installed: paper tracing paper - fluoroplastic film - paper tracing paper, whose contact area x equals the area of the intermediate washers.