EA017053B1 - Triple twin cylindrical reduction gear - Google Patents

Abstract

The invention relates to oil industry and in particular can be used as a gear unit (reducer) of a mechanical drive in borehole pumps. A triple twin cylindrical reduction gear comprises a body, a drive shaft, mounted by its ends in the body on two first rolling bearings, a driven gear symmetrically positioned relative to first rolling bearings and rigidly fixed on the drive shaft by means of a key connection, driven toothed gear wheels symmetrically positioned relative to supports, first slide bearings mounted on the axis in both sides of the body inside two hollow driven shafts mounted on two second rolling bearing, housing of the drive and driven shafts are made in body, two-crown gear blocks symmetrically arranged on second slide bearings mounted on the drive shaft, triple gear block arranged between driven toothed gear wheels on three slide bearing mounted on the axis, wherein the drive gear of the drive shaft engages the central toothed gear of the triple gear block, side toothed wheels arranged on both sides of the central toothed wheel are in mesh with the driven gear of the two-crown gear blocks, and drive gears of said blocks engage driven toothed gear wheels of the reducer driven shafts.

Description

(57) The invention relates to the field of petroleum engineering and, in particular, can be used as a transmission mechanism (gearbox) for a mechanical drive of downhole pumps. A three-stage two-line cylindrical gearbox comprising a housing, a drive shaft mounted at its first ends in the housing on two first rolling bearings, a drive gear symmetrically located relative to the first rolling bearings and rigidly fixed to the drive shaft by means of a key coupling, driven gears symmetrically located relative to the bearings, the first plain bearings mounted on an axis on both sides of the housing inside two hollow driven shafts mounted on two second bearings rolling elements, bearing housings of the driving and driven shafts, made in the housing, two-gear gear blocks symmetrically mounted on the second sliding bearings mounted on the drive shaft; a three-gear block of gears mounted between the driven gears on the third plain bearings mounted on the axis, while the drive gear of the drive shaft is engaged with the central gear of the three-gear block, the side gears located on both sides of the Central gear meshing with the driven gears of two-axle blocks, and the driving gears of these blocks are engaged with the driven gears of the driven gear shafts.

The invention relates to the field of petroleum engineering and, in particular, can be used as a gear mechanism for the mechanical drive of downhole pumps.

The known design of a cylindrical three-stage gearbox with chevron gears of a rocking machine, the closest in technical essence, which is the prototype of the proposed cylindrical two-line three-stage gearbox (IzhMSK. Reducers for rocking machines. Reducers for three-stage chevron rocking machines type TsZNSh-450. sgps1 1Shr: / \ y \ y \ y.1 / 1sh15k.ibt.gi / g51k.1it-prototype).

The known design comprises a housing, a drive shaft mounted at its ends in the gear housing on two rolling bearings, a gear rigidly fixed to the drive shaft by keyway connection and gears symmetrically positioned relative to the bearings.

The well-known cylindrical three-stage gearbox of borehole pumps with a symmetrical arrangement of gears relative to the bearings is designed to increase the torque and reduce the speed in the drives of the pumping units.

However, the described design of a cylindrical three-stage gearbox has a relatively low reliability, manufacturability, increased metal consumption, as well as low efficiency. This is due to the presence in the design, in addition to the drive and driven shafts, of two intermediate shafts installed in the rolling bearings, which leads to an increase in metal consumption, a decrease in the level of reliability, efficiency, manufacturability and unification; increasing noise, vibration and material consumption for transmitting the required torque of a low-speed shaft of a three-stage gearbox.

The objective of the invention is to increase the reliability and gear ratio, reducing power consumption, noise and weight of the gearbox.

The objective of the invention is solved in that a three-stage two-line cylindrical gearbox comprises a housing, a drive shaft mounted at its ends by two ends in the housing on the first two rolling bearings;

a pinion gear symmetrically positioned relative to the first rolling bearings and rigidly fixed to the drive shaft by means of key coupling;

driven gears symmetrically positioned relative to the bearings;

first sliding bearings mounted on an axis on both sides of the housing inside two hollow driven shafts mounted on two second rolling bearings;

bearing housings of drive and driven shafts made in the housing;

double-crowned gear units symmetrically mounted on second plain bearings mounted on a drive shaft;

a three-gear block of gears mounted between the driven gears on the third plain bearings mounted on the axis, while the drive gear of the drive shaft is engaged with the central gear of the three-gear block, the side gears located on both sides of the Central gear meshing with the driven gears of two-axle blocks, and the driving gears of these blocks are engaged with the driven gears of the driven gear shafts.

The above contributes to a decrease in metal consumption and an increase in the reliability level of the gearbox due to the exclusion of two intermediate shafts and two pairs of rolling bearings from this mechanical system;

ensuring manufacturability and unification, since the gears and two-gear blocks of gears that are part of the gearbox in all its steps have the same geometric dimensions;

noise and vibration reduction due to the use of more accurate and high-quality double plain bearings in two-gear gear blocks;

ensuring the balance of the system due to the symmetrical arrangement of heavily loaded gears near the bearings of the output shaft;

reducing the overall dimensions and weight of the gearbox and, consequently, the consumption of materials for transmitting torque due to the exclusion of two intermediate shafts mounted on rolling bearings from the mechanical system;

coincidence of the direction of rotation of the gear blocks of the drive and driven shafts, which contributes to the appearance of the useful friction force in the cylindrical and end surfaces of these sliding bearings and to increase the efficiency of the gearbox;

increasing the technical level of the gearbox to modern (record) samples by reducing the ratio of its mass to the torque of the low-speed shaft.

In FIG. 1 shows a kinematic diagram, and FIG. 2 - design of a three-stage two-line cylindrical gearbox.

A three-stage two-line cylindrical gearbox comprises a gearbox housing 1, a drive shaft 2, mounted at its ends in the housing 1 on the first two rolling bearings 3, 4;

- 1 017053 drive gear 6, symmetrically located relative to the rolling bearings 3, 4 and rigidly fixed to the drive shaft by means of key coupling 5;

driven gears symmetrically positioned relative to the supports 7, 8;

plain bearings 9, 10 mounted on an axis 11 on both sides of the housing 1 inside two hollow driven shafts 12, 13 mounted on two rolling bearings 14, 15, while the gear housing 1 has a bearing housing for driving and driven shafts;

two-crown gear blocks 16, 17 mounted for rotation on sliding bearings 18, 19 mounted on the drive shaft 2, each of the two-gear blocks 16, 17 having a slave 16 ', 17' and a drive leading rigidly interconnected and parallel to each other 16, 17 gears;

a three-gear block 20 of gears mounted rotatably between the driven gears 7, 8 on the sliding bearings 21, 22, while the three-crown block 20 has a central gear 20 ′ and side gears 20 rigidly connected to it, and the direction of rotation of the gear block 20 meshed with the corresponding gears of the next stages, coincides with the direction of rotation of the leading 2 and driven 12, 13 shafts.

As shown in FIG. 1, gears and gears in the proposed gearbox are connected as follows. The pinion gear 6 of the drive shaft 2 is meshed with the central gear wheel 20 ′ of the three-crown block 20, the side gears 20 located on both sides of said central gear wheel 20 ′ are engaged with the driven gears 16 ′, 17 ′ of the two-crown blocks 16 , 17, and the drive gears 16, 17 of these blocks 16, 17 are engaged with the driven gears 7, 8 of the driven shafts 12, 13 of the gearbox.

The proposed gearbox operates as follows. The rotation of the drive shaft 2 through the key connection 5 is transmitted through the gear 6 to the central gear wheel 20 'of the tri-gear block 20 gears and through the side gears 20 of the tri-gear block 20 gears rotating around the axis 11, symmetrically located two-gear blocks 16, 17 gears, which in turn transmit the rotation of the driven gears 7, 8 and through them the hollow driven shafts 12, 13. Thereby, torque is transmitted through three gear stages with the corresponding gear ratio and often that rotation.

The proposed package gearbox can be made on the basis of a set of unified gears and two-gear blocks of gears depending on a pre-selected number of odd gear stages and its total gear ratio.

A comparative assessment of the level of reliability, efficiency and metal consumption (overall dimensions) of the proposed and known (prototype) design is made.

Based on experimental studies and bench tests, it was found that, ceteris paribus, the reliability level of the proposed design is increased by 7.4% and up to 10% of the gearbox efficiency. At the same time, the overall dimensions of the gearbox and power consumption are reduced on average to 25%.

Claims (1)

CLAIM A three-stage two-line cylindrical gearbox comprising a housing (1), a drive shaft (2) mounted at its first ends in the housing (1) on two first rolling bearings (3, 4), a drive gear (6) symmetrically located relative to the first bearings (3, 4) rolling and rigidly mounted on the drive shaft (2) by key coupling (5), driven gears (7, 8) symmetrically located relative to the bearings, first sliding bearings (9, 10) mounted on the axis (11) on both sides housing (1) inside two hollow driven shafts (12, 13) mounted on two second rolling bearings (14, 15), bearing housings of the driving (2) and driven (12, 13) shafts, made in the housing (1), two-crown gear units (16, 17) symmetrically mounted on the second bearings (18 , 19) sliding mounted on the drive shaft (2); a three-gear block (20) of gears mounted between the driven gears (7, 8) on the third (21, 22) plain bearings mounted on the axis (11), while the drive gear (6) of the drive shaft (2) is engaged the central gear wheel (20 ') of the three-crown block (20), the side gears (20) located on both sides of the specified central gear (20') are engaged with the driven gears (16 ', 17') of the two-crown blocks ( 16, 17), and the drive gears (16, 17) of these blocks (16, 17) mesh with the driven gears themselves (7, 8) driven shafts (12, 13) of the gearbox.