WO2024061388A1

WO2024061388A1 - Pillow block integrated into a sliding bearing with a fluid cushion

Info

Publication number: WO2024061388A1
Application number: PCT/CO2023/000020
Authority: WO
Inventors: Teodicelo GÓMEZ PUENTES
Original assignee: Gomez Puentes Teodicelo
Priority date: 2022-09-19
Filing date: 2023-09-19
Publication date: 2024-03-28
Also published as: CO2022013423A1

Abstract

The invention relates to a pillow block integrated into a sliding bearing with a fluid cushion, which comprises: a pillow block (2) with an internal sliding track (3); an inner race (4) with an external sliding track (5); and two discs (6-1, 6-2), the internal profile of each having two cavities, one to accommodate a guide ring (7) and the other to accommodate an O-ring (8) with two rings, a backup ring and a wiper ring, the pillow block being characterised in that the sliding tracks (3, 5) form a cavity filled with a pressurised fluid.

Description

PILLOW BLOCK INTEGRATED TO A SLIDING BEARING WITH A FLUID MATTRESS

FIELD OF THE INVENTION

The present invention is related to a new prototype of a pillow block integrated into a sliding bearing, to provide support and guidance to a rotating shaft, reducing friction and facilitating operation.

The applications of this new invention are in vehicles, machines, industries, etc.

BACKGROUND OF THE INVENTION

Fluid pillow blocks are bearings in which the load is supported by a thin layer of pressurized liquid that moves rapidly between the bearing surfaces.

They can be classified into two groups:

First group, hydrostatic bearings, are externally pressurized fluid bearings, using a hydraulic power unit.

Second group, hydrodynamic bearings, rely on the high speed of the journal (the part of the shaft that rests on the fluid) to pressurize the fluid into a wedge between the faces.

Technical problem and solution to the problem:

• Technical problem, fluid bearings must maintain pressure to avoid wear and hydrostatic type bearings generally require being completely immobile when depressurized.

- Solution to the problem, the pillow block of the invention is designed with a pressurized fluid cushion.

• Technical problem, the overall power consumption is usually higher compared to rolling bearings.

- Solution to the problem, the overall energy consumption is lower compared to fluid bearings and rolling bearings, because the dynamic ring rotates on a cushion of fluid.

• Technical problem, Many types of fluid bearings can seize catastrophically in shock situations or unexpected loss of supply pressure. - Solution to the problem, the pillow blocks of the invention are designed with guide rings, which have the function of supporting static radial-axial loads, absorbing radial shocks with dynamic loads.

• Like cage frequency vibration in a ball bearing, mid-frequency whirl is a bearing instability that causes eccentric precession, which can lead to poor performance and reduced service life.

- Solution to the problem, the blocks of the invention are designed with a pressurized fluid cushion, with guide rings.

• Hydrostatic and hydrodynamic fluid bearings have a large number of components.

- Solution to the problem, the pillow blocks are integrated into the sliding bearings. There is a heavy duty configuration where the pillow block is separate from the sliding bearing, being self-aligning.

• Fluid bearings are not practical in environments where oil leaks may be a problem or where maintenance is not economical.

- Solution to the problem, they have a pressurized fluid cushion and require maintenance after thousands of hours of work.

• Fluid bearings must often be used in pairs or groups of three, to prevent the bearing from tilting and losing fluid from one side.

- Solution to the problem, the pillow blocks of the invention, in some designs are self-aligned with the axis and in other designs the guide rings have the function of absorbing axial forces, a product of misaligned axis or due to flexion of the axis.

BRIEF DESCRIPTION OF THE INVENTION

The pillow block is part of the sliding bearing, the block has the inner sliding race machined, the outer ring of the bearing is not required, leaving the block integrated into the bearing.

The different types and designs of sliding races of the “Fluid Cushion Sliding Bearing” are machined into the block and ring of the present invention.

The block can be replaced by the housing of a mechanism that has a hole with a wall thick enough to machine the inner sliding race, the ring can also be replaced by the shaft, machining the outer sliding race on the shaft. The manufacturer may replace one or both components, block or rim, if feasible.

The heavy duty sliding bearing pillow block can have optional attachments such as; chamber in the block for the circulation of a cooling fluid to dissipate excess temperature, connect the fluid cushion of each cavity with an accumulator, to cushion high pressure peaks, resulting from axial shocks, this implement is especially for sliding bearing with angular sliding track type.

The pillow block with self-aligning heavy-duty sliding bearing requires separating the block from the bearing, because if a sliding bearing is used with the spherical sliding race ring, the load capacity would be limited.

The block will have an inner spherical race, and the outer ring of the sliding bearing will have a spherical outer race.

Heavy duty sliding bearings can have a combination of sliding races and cavities for radial and axial loads, with the advantage of supporting large radial and axial loads at the same time.

For heavy work, the fluid mattresses will be pressurized at high pressures, with the hydraulic seals supporting the pressure at all times. To release the hydraulic seals and allow them to remain at rest under static load, two different circuits can be used as an option. hydraulics to pressurize and depressurize the mattresses:

First option, it is used to pressurize and depressurize the fluid mattresses, the hydraulic power unit by pressurizing the fluid mattresses is released to provide hydraulic power to tools or hydraulic mechanisms.

Second option, it is used to pressurize and depressurize fluid mattresses. The hydraulic power unit is required to generate a flow rate to cool the fluid cushions, whenever the temperature exceeds the normal limit.

With this hydraulic system, the sliding bearings can operate with sources that generate high temperatures.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 shows a perspective view of the parts that make up the pillow block integrated into a sliding bearing, the block is pedestal type and the sliding bearing is for radial loads, in the assembled position. Figure 2 shows a perspective view of the exterior of the pillow block integrated into a sliding bearing, the block is pedestal type and the sliding bearing is for radial loads.

Figure 3 shows a perspective view of the parts that make up the pillow block integrated into a sliding bearing, the round flange-type block, and the sliding bearing for axial loads, in the assembled position.

Figure 4 shows a perspective view of the exterior of the pillow block integrated into a sliding bearing, the block is a round flange type and the sliding bearing is for axial loads. Figure 5 shows a perspective view of the parts that make up the pillow block integrated into a spherical sliding bearing, the block is a square flange type, in the assembly position.

Figure 6 shows a perspective view of the exterior of the pillow block integrated into a spherical sliding bearing, the block is a square flange type.

Figure 7 shows a sectional view of the internal parts that make up the pillow block integrated into a sliding bearing, for radial and axial loads, for heavy duty.

Figure 8 shows a sectional view of the internal parts that make up the pillow block integrated into a sliding bearing, self-aligning for radial and axial loads, for heavy duty.

Figure 9, A, B, C, shows a sectional view of a housing with a hole, on which an internal sliding race has been machined.

Figure 10, A, B, shows a sectional view of a shaft, on which an external sliding race has been machined.

Figure 1 1, A, B, shows two diagrams connecting fluid cushions with hydraulic systems.

DETAILED DESCRIPTION OF THE INVENTION

This patent describes the design of a new prototype pillow block integrated into a sliding bearing with a fluid cushion.

Figure 1 shows the pillow block integrated into a sliding bearing 1, made up of a pedestal-type pillow block 2, which has the inner sliding track 3 machined, by an inner ring 4 with the outer sliding track 5, by two discs. 6-1 -2, each in the inner profile with two cavities, one to house a guide ring 7 and the other to house an O-ring with two rings, one for backing and one for scraper 8, between the sliding races 3 and 5 basic type and semicircle design, a circular cavity filled with a pressurized fluid is formed. Figure 2 shows the pillow block integrated into an assembled sliding bearing 1, the sliding bearing is for radial loads.

Figure 3 shows the pillow block integrated into a sliding bearing 9, formed by a round flange type pillow block 2, which has the inner surface 10 machined, by an inner ring 4 with the outer surface 5 with the cavity divider 11 in the center of said surface, by two discs 6-1 -2, each one in the inner profile with two cavities, one to house a guide ring 7, and the other to house an O-ring with two rings, one of backing and another with scraper 8, the two semicircle cavities, formed between the faces of the divider and the sliding tracks, are filled with a pressurized fluid. Figure 4 shows the pillow block integrated into an assembled sliding bearing 9, the sliding bearing is for axial loads.

Figure 5 shows the pillow block integrated into a spherical sliding bearing 13, made up of a square flange-type pillow block 2, which has the inner sliding track 3 machined, by an inner ring 4 with the outer track 5 with a curvature in spherical shape 14, by two discs 6-1 -2, each one in the inner profile with two cavities, one to house a guide ring 7, and the other to house an O-ring with two rings, one for backing and the other for scraper. 8, a semicircle cavity is formed between the sliding track and the sphere, filled with a pressurized fluid. Figure 6 shows the pillow block integrated into an assembled sliding bearing 9, the sliding bearing is self-aligning.

Figure 7 shows the pillow block integrated into a sliding bearing 15, for heavy-duty radial and axial loads, consisting of a pedestal-type pillow block, divided into two 2-1-2 to facilitate assembly, each block has machined an inner sliding track 3-1 -2 angular type, by an inner ring 4 with the outer sliding tracks 5-1 -2 angular type, the inner discs integral with said ring, remains as a cavity divider 16, by two discs 6 -1 -2 each in the inner profile with two cavities, one to house a guide ring 7, and the other to house an O-ring with two rings, one for backing and the other for scraper 8.

The sliding bearing is double cavity 17-1 -2 for greater surface area in contact with the two fluid cushions 18-1 -2.

The sliding bearing has two groups of guide rings; The first group of guide rings 7-1-4 are housed in the cavities of the discs 6-1-2, the second group of guide rings 7-2-3 are housed in cavities of the cavity divider 16. By having four guide rings 7-1 -2-3-4, the sliding bearing will have greater support to support static radial loads, greater capacity to absorb radial shocks with dynamic loads, greater capacity to absorb axial forces resulting from misalignment and shaft bending.

The sliding bearing with angular type sliding races, the walls of the cavities can be contracted to absorb axial loads, axial shocks generate high pressure peaks, with the option of connecting a 19-1-2 accumulator to each cavity, which has the functions of controlling the pressure inside the cavity, as the fluid expands, its volume increases, increasing the pressure, the accumulator will act as a relief valve, axial shocks, with dynamic loading, will generate high pressure peaks, With the risk of damaging O-rings or hydraulic seals, the accumulator cushions high pressure peaks.

The pillow block integrated into a sliding bearing 15, when subjected to large dynamic loads, or being close to sources that generate high temperatures, has the option of a chamber 20 in the block, with an inlet port 21 -1 and a outlet port 21 -2, for the circulation of a cooling fluid, to dissipate excess temperature from the components of the pillow block integrated into a sliding bearing.

Figure 8 shows the pillow block with a sliding bearing 22, for heavy duty radial and axial loads, the pillow block is not integrated into the sliding bearing, being divided into two parts:

First part, pillow block that is divided into two 2-1 -2 for the army, each block has an inner track in the shape of a semisphere 23-1 -2, and a semicircle cavity 24-1 -2. Second part, sliding bearing 25 made up of an outer ring 26 with the spherical outer race 27 with a guide 28 that limits the rotation through the circular cavity 24, by an inner ring 29, the bearing has three cavities 17-1 - 2-3 and three fluid cushions 18-1 -2-3, the cavity 17-2 in the center is for radial loads, with a spider-type sliding track with tower legs 30, by two inner discs 6-2-3, the cavities 17-1 -3 at the ends is for axial loads, by two discs 6-1 -4 at the ends, with spider-type sliding tracks of tower legs 31 -1 -2.

The sliding bearing has four discs, two internal and two at each end, each disc has a 7-1 -2-3-4 guide ring, for greater support, to withstand static radial loads, greater ability to absorb radial shocks with dynamic loads, greater capacity to absorb axial forces resulting from misalignment and flexion of the shaft. The pillow block with a 22 slide bearing, is designed to support heavy duty radial and axial loads and is self-aligning.

Figure 9 shows a housing of a mechanism 32, which acts as a pillow block. The manufacturer has three options for machining the inner sliding track 3, over the hole 33:

A, housing 32 over hole 33, has sliding race 3 machined.

B, housing 32 over hole 33, has sliding track 3 machined along with one of the discs 6.

C, the housing 32 over a hole 33 with a single entry, has the sliding track 3 machined together with one of the discs 6.

Figure 10 shows an axis 34 of a mechanism, replacing the inner ring, the manufacturer has two options for machining the outer sliding track 5, on the axis 34:

A, on shaft 34, has sliding track 5 machined.

B, on shaft 34, has the sliding track 5 machined together with one of the discs 6.

The heavy-duty integrated pillow block or with a sliding bearing requires a cushion of pressurized fluid at high pressure, due to the large dynamic loads it will support, the hydraulic seals will withstand the pressure at all times, to To release them and leave them at rest under a static load, the manufacturer can use, as an option, a hydraulic system, with two different hydraulic circuits to pressurize and depressurize the mattresses. Figure 11 shows the diagrams of the optional hydraulic circuits:

A, the first hydraulic circuit, pressurized and depressurized, made up of a hydraulic power unit 35, which supplies, through conduit 36-1, a flow through port 37-1 to the control unit 38, ports 37-2 -4 are closed and the open port 37-3 connected through the conduit 36-2, to a certain number of fluid cushions 39, raising the fluid cushions to a certain pressure and immediately the port 37-3 is closed and opens port 37-2 that connects hydraulic power to certain mechanisms. By connecting port 37-3 to port 37-4, which is connected to reservoir 40, the fluid cushions are depressurized.

B, the second hydraulic circuit, pressurized, fluid circulation and depressurized, made up of a hydraulic power unit 35 that has a non-return valve 41 at the outlet, supplies a flow through the conduit 36-1, which connects a certain number of fluid cushions 39, which in turn are connected to a second conduit 36-2 that connects to a control valve 42, when the hydraulic circuit is pressurized, the hydraulic power unit will remain at rest, until the temperature sensor sends a signal indicating that the temperature of the fluid has exceeded the normal limit, the hydraulic power unit will supply a flow that circulates in the hydraulic circuit dissipating excess temperature from the sliding bearings.

When the sliding bearings are under static load, the control valve 45 opens, connecting the conduit 36-2 with the tank 40, depressurizing the fluid cushions.

The sliding bearings before entering dynamic loading, the fluid cushions must be pressurized. To depressurize fluid cushions, the sliding bearings must be statically loaded.

Sliding bearings under static load, the load will be supported by the guide rings, which must have minimum clearances.

Claims

1, Pillow block integrated into a sliding bearing with a fluid cushion, comprising:

A pillow block 2 with the inner sliding race 3, an inner ring 4 with the outer sliding race 5, two discs 6-1 -2, each in the inner profile with two cavities, one to accommodate a guide ring 7 and the another to house an O-ring with two rings, one for backing and the other for scraper 8, characterized in that the sliding tracks 3 and 5 form a cavity filled with a pressurized fluid.

2, Pillow block according to claim 1, characterized in that the heavy-duty pillow block is divided into two parts 2-1-2, to facilitate assembly.

3, Pillow block according to claim 1, characterized in that the heavy-duty pillow block is divided into parts; the pillow block 2 with spherical inner race 23, and the sliding bearing 25 with the outer ring 26 with the spherical outer race 27.

4, Sliding pillow block according to claim 1, characterized in that the sliding bearing 25 can have a plurality of sliding races 30 and 31 -1 -2, with cavities 17-1 -2-3, combined for radial and axial loads, and a plurality of inner and outer discs 6-1 -2-3-4, to separate the cavities.

5, Pillow block according to claim 1, characterized in that the heavy-duty pillow block has a plurality of guide rings 7, in contact with the sliding surfaces, for greater support of static radial loads, greater capacity to absorb radial-axial shocks. with dynamic loads, greater capacity to absorb axial forces, product of misaligned shaft or shaft bending.

6, Pillow block according to claim 1, characterized in that the heavy-duty pillow block, each cavity 17 with the fluid cushion 18, can be connected to an accumulator 19, to cushion high pressure peaks, produced by axial shocks.

7, Pillow block according to claim 1, characterized in that the heavy-duty pillow block, the pillow block 2 may have a chamber 20 with inlet and outlet ports 21 -1 -2, for the circulation of a cooling fluid.

8, Sliding pillow block according to claim 1, characterized in that the housing 32 of a mechanism, it acts as a pillow block, machining the inner sliding track 3 on a hole 33.

9, Sliding pillow block according to claim 1, characterized in that the axis 34 of a mechanism replaces the inner ring, machining the outer sliding track 5 on said axis. 10, Sliding pillow block according to claim 1, characterized in that a hydraulic system to pressurize and depressurize a certain number of fluid cushions 39, the hydraulic circuit made up of a power unit 35, a control unit 38, ducts 36-1-2, temperature sensor 43 and a tank 40.