WO2011096672A2

WO2011096672A2 - Structure for fixing shaft and oil film bearing

Info

Publication number: WO2011096672A2
Application number: PCT/KR2011/000583
Authority: WO
Inventors: Sung Hyun Cho; Myoung Ki Shin
Original assignee: Hankuk Special Steel Co.,Ltd
Priority date: 2010-02-03
Filing date: 2011-01-27
Publication date: 2011-08-11
Also published as: WO2011096672A3

Abstract

Provided are a structure of fixing a shaft and an oil film bearing. In more detail, the exemplary embodiment of the present invention relates to a structure of fixing a shaft and an oil film bearing capable of preventing a fusion between the shaft and a fixing part or between the shell and the housing by forming a first oil groove or a second oil groove.

Description

STRUCTURE FOR FIXING SHAFT AND OIL FILM BEARING

The present invention relates to a structure for fixing a shaft and an oil bearing, and more particularly, to a structure a structure for fixing a shaft including a first oil groove or a second oil groove to prevent a fusion between the shaft and a fixing part or between a shell and a housing and an oil film bearing.

A shaft supports parts such as a roll and a mechanical part transferring power. Generally, the shaft is formed on both sides of the roll and is transferred with power through a bearing including a fixing part.

The roll is a circumferential part used for a rolling mill or a polishing device.

In particular, a rolling mill is an apparatus that machines/changes intermediate materials having a predetermined shape, such as slab, bloom, billet, or the like, all of which are subjected to an iron making process, a steel making process, and a casting process, to be manufactured as a steel sheet, a wire rod, etc.

It is important that the rolling mill withstands high load and impact to maintain a rolled iron plate at a predetermined thickness. Generally, the shaft and the fixing part fixing the shaft are disassembled once or twice per month to be checked, replaced, or the like.

However, since the rolling mill is continuously exposed to the working environment of an extreme pressure load, the shaft and the fixing part, which are assembled in a press-fit manner, have a vertical load and a side load applied therebetween during the rolling process and are fused due to an oil film snapping under poor operation conditions, such that it is very difficult to disassemble the roll.

In the related art, a method of abnormally disassembling a roll by applying impact a separate roll in order to separate the roll from the fixing part has been used. The method may delay the roll checking and replacing time with the increased of disassembling time and may largely degrade safety.

In addition, the maintenance time of the shaft and the fixing part is increased due to a process of removing carbon formed on the surface caused by the deterioration between the shaft and the fixing part, etc., and the durability and lifespan of each part are shortened, thereby degrading productivity.

Therefore, a need exists for a detailed solution for a structure for fixing a shaft capable of easily fixing the shaft in a press-fit manner, preventing the fusion between the shaft and fixing part, and facilitating the disassembling process.

An object of the present invention provides a structure for fixing a shaft and oil bearing capable of preventing a fusion between the area by forming an oil groove on one side or both sides of the fixing part and the shaft and forming an oil groove on one side or both sides of a shell of a bearing and a housing to facilitate the operation of the shaft and suppressing the generation of carbon due to oxidation of oil to remarkably increase the durability and used lifespan.

In addition, another object of the present invention provides a structure for fixing a shaft and oil film bearing capable of preventing a fusion between a fixing part and a shaft to shorten a disassembling time and a maintenance time of the fixing part and the support and increasing overall process efficiency.

In one general aspect, a structure of fixing a shaft 100 of the present invention includes: shafts 100 formed on both sides of a roll and a cylindrical fixing part 200 press-fitted with the shaft 100 to support the shaft 100, wherein the fixing part 200 is provided with a first oil supplying hole 220 and one side or both sides of a surface where the fixing part 200 contacts the shaft 100 are provided with

first oil grooves

110 and 210 in which oil flows.

The inner diameter of the fixing part 200 may be inclinedly formed to be narrow toward a side into which the shaft 100 is inserted and the shaft 100 may be formed to correspond to the shape of the fixing part 200.

The

first oil grooves

110 and 210 may be formed in an insertion direction of the shaft 100 and may be formed to include first

axial oil grooves

111 and 211 formed in plural at the outer circumference of the shaft 100 or the inner circumference of the fixing part 200 and first

circumferential oil grooves

112 and 212 formed to surround the outer circumference of the shaft 100 or the inner circumference of the fixing part 200.

The first

circumferential oil grooves

112 and 212 may be seamlessly formed in a spiral shape.

The first

circumferential oil grooves

112 and 212 in the spiral shape may be formed in at least two to intersect with each other by controlling a formation angle.

The first

circumferential oil grooves

112 and 212 may be formed in a circumferential shape and may be formed in plural in the insertion direction of the shaft 100.

In another aspect, an oil bearing 100 of the present invention includes: a shaft 100 and a fixing part 200; a shell 300 provided at the outer side of the fixing part 200; and a housing 400 provided at the outer side of the shell 300.

The oil film bearing 1000 may have

second oil grooves

310 and 410, in which oil flows, formed on one side or both sides of a surface where the shell 300 contacts the housing 400.

In another aspect, an oil film bearing 1000 of the present invention includes: a housing 400; a shell 300 provided at the inner side of the housing 400; and a cylindrical fixing part 200 provided at an inner side of the shell 300 and press-fitted with a shaft 100, wherein one side or both sides of a surface where the housing 400 contacts the shell 300 are provided with

second oil grooves

310 and 410 in which oil flows.

The

second oil grooves

310 and 410 may be formed in the longitudinal direction of the shell 300 or the housing 400 and may be formed to include second

axial oil grooves

311 and 411 formed in plural at the outer circumference of the shell 300 or the inner circumference of the housing 400 and second

circumferential oil grooves

312 and 412 formed to surround the outer circumference of the shell 300 or the inner circumference of the housing 400.

The second

circumferential oil grooves

312 and 412 may be seamlessly formed in a spiral shape.

The second

circumferential oil grooves

312 and 412 in the spiral shape may be formed in at least two to intersect with each other by controlling a formation angle.

The second

circumferential oil grooves

312 and 412 may be formed in a circumferential shape and may be formed in plural in a longitudinal direction of the shell 300 or the housing 400.

As set forth above, the exemplary embodiment of the present invention can easily supply oil to a portion in which the oil groove is not formed and reducing the loss of oil due to a centrifugal force to prevent the fusion in the are, by forming the oil groove on one side or both sides of the fixing part and the shaft and forming the oil groove on one side or both sides of the bearing shell and the housing, thereby making it possible to facilitate the operation of the shaft and remarkably increase the durability and the use lifespan.

In addition, the structure of fixing a shaft and the oil film bearing according to the exemplary embodiment of the present invention prevent the fusion between the fixing part and the support to shorten the disassembling time and the maintenance time of the fixing part and the shaft and remarkably reduce the generation of carbon due to the oxidation of oil for lubrication to increase the overall production efficiency.

FIG. 1 is a perspective view of a structure of fixing a shaft according to an exemplary embodiment of the present invention;

FIG. 2 is a cross-sectional perspective view showing a first oil groove of a shaft according to a structure of fixing a shaft according to the exemplary embodiment of the present invention;

FIG. 3 is a cross-sectional perspective view showing a first oil groove according to the exemplary embodiment of the present invention;

FIG. 4 is a perspective view showing an oil film bearing according to the exemplary embodiment of the present invention;

FIG. 5 is a perspective view showing a portion of an oil film bearing according to the exemplary embodiment of the present invention;

FIG. 6 is a cross-sectional perspective view showing a second oil groove of a shell according to the oil film bearing of the present invention; and

FIG. 7 is a cross-sectional perspective view showing a second oil groove of a housing according to the oil film bearing of the present invention.

[Detailed Description of Main Elements]

100: SHAFT

110: FIRST OIL GROOVE

111: FIRST AXIAL OIL GROOVE

112: FIRST CIRCUMFERENTIAL OIL GROOVE

200: FIXING PART

210: FIRST OIL GROOVE

211: FIRST AXIAL OIL GROOVE

212: FIRST CIRCUMFERENTIAL OIL GROOVE

220: FIRST OIL SUPPLYING HOLE

300: SHELL

310: SECOND OIL GROOVE

311: FIRST AXIAL OIL GROOVE

312: FIRST CIRCUMFERENTIAL OIL GROOVE

320: SECOND OIL SUPPLYING HOLE

400: HOUSING

410: SECOND OIL GROOVE

411: FIRST AXIAL OIL GROOVE

412: FIRST CIRCUMFERENTIAL OIL GROOVE

1000: BEARING

Hereinafter, as described above, a structure of fixing a shaft 100 and an oil film bearing 1000 will be described with reference to the accompanying drawings.

The structure of fixing a shaft 100 according to the exemplary embodiment of the present invention relates to a structure of fixing a shaft 100 and a fixing part 200 fixing the same, wherein the shaft 100 is formed on both sides of the roll to serve to transfer power.

The fixing part 200 is formed in a cylindrical shape and the shaft 100 is press-fitted in the inner side thereof to support the shaft 100.

In this configuration, the shaft 100 is assembled to be press-fitted in the inner side of the fixing part 200 by a force applied to the side of the fixing part 200, such that the assembling is facilitated and the inner diameter of the fixing part 200 may be inclinedly formed to be narrow toward a side into which the shaft 100 is inserted.

Of course, the shape of the shaft 100 included in the fixing part 200 is also formed in a shape where the diameter of the shaft 100 is narrow in one side direction (a direction into which the shaft 100 is inserted).

In this case, the structure of fixing a shaft 100 of the present invention is provided with a first oil supplying hole 220 penetrating through the fixing part 200 from an outer side to an inner side to supply oil and one side or both sides of a surface where the fixing part 200 contacts the shaft 100 are provided with

first oil grooves

110 and 210 in which oil flows.

The

first oil grooves

110 and 210 are formed at an inner circumference of the fixing part 200 or an outer circumference of the shaft 100. FIG. 1 shows an example where the

first oil grooves

110 and 210 are formed at both the inner circumference of the fixing part 200 and the outer circumference of the shaft 100.

The

first oil grooves

110 and 210 is formed to have first

axial oil grooves

111 and 211 and first

circumferential oil grooves

112 and 212 in order to more maximize lubrication due to oil provided at a surface where the fixing part 200 contacts the shaft 100.

First, when the first oil groove 111 is formed on the shaft 100, the first axial oil groove 110 is formed into the insertion direction of the shaft 100 but the first axial oil groove 111 is provided in plural at the outer circumference of the shaft 100. The first circumferential oil groove 112 is formed to surround the outer circumference of the shaft 100.

In addition, when the first oil groove 210 is formed on the fixing part 200, the first axial oil groove 211 is formed into the insertion direction of the shaft 100 but the first axial oil grooves 211 are provided in plural at the inner circumference of the fixing part 200. The first circumferential oil groove 212 is formed to surround the inner circumference of the fixing part 200.

In this case, the insertion direction of the shaft 100 implies that the inner diameter of the cylindrical fixing part 200 is formed to be inclinedly so that it may be formed to be inclined by a predetermined angle with respect to a central axis of the shaft 100.

The first

circumferential oil grooves

112 and 212 may be seamlessly formed in a spiral shape. The first

circumferential oil grooves

112 and 212 in the spiral shape may be formed in one seamless shape and at least two first circumferential oil grooves may be formed to intersect with each other by controlling their formation angles.

In addition, the first

circumferential oil grooves

112 and 212 are formed in a circumferential shape, such that they may be formed in plural in the insertion direction of the shaft 100.

FIGS. 2 and 3 show a type of the

first oil grooves

110 and 210 formed on the shaft 100 and the fixing part 200. FIG. 2 and FIG. 3A show an example where the first

axial oil grooves

111 and 211 and the first

circumferential oil grooves

112 and 212 in a spiral shape are formed. FIGS. 2 and FIG. 3B show the same shape as the shape shown in FIG. 2 and FIG. 3A and shows an example where two first

circumferential oil grooves

112 and 212 in the spiral shape are formed to intersect with each other. FIG. 2 and FIG. 3C show an example where the first

axial oil grooves

111 and 211 and the first

circumferential oil grooves

112 and 212 in the circumferential shape are formed.

The

first oil grooves

110 and 210 may be formed at one of the outer circumference of the shaft 100 and the inner circumference of the fixing part 200 or at both sides of the outer circumference of the shaft 100 and the inner circumference of the fixing part 200.

As described above, the structure of fixing a shaft 100 according to the exemplary embodiment of the present invention prevents the fusion in the area by forming the

first oil grooves

110 and 210, thereby facilitating the operation of the shaft 100 and remarkably increasing the durability and the use lifespan.

Meanwhile, the oil film bearing 1000 according to the exemplary embodiment of the present invention is formed so that the shaft 100 and the fixing part 200 have the structure of fixing a shaft 100 as described above. The oil film bearing 1000 may be formed to include a shell 300 provided at the outer side of the fixing part 200; and a housing 400 provided at the outer side of the shell 300.

The oil film bearing 1000 has a configuration to form an oil film between the fixing part 200 and the shell 300, thereby making it possible to easily transfer the rotary force. The oil between the fixing part 200 and the shell 300 may be operated as a lubricant between the fixing part 200 and the shaft 100 through the first oil supplying hole 220.

In addition, in the oil film bearing 1000 according to the exemplary embodiment of the present invention, the

second oil grooves

310 and 410 in which oil flows may be formed on one side or both sides of a surface where the shell 300 contacts the housing 400.

Meanwhile, the oil film bearing 1000 according to the exemplary embodiment of the present invention includes the housing 400, the shell 300 provided at the inner side of the housing 400, and the cylindrical fixing part 200 provided at the inner side of the shell 300 to be press-fitted with the shaft 100. In the oil film bearing 1000, the

second oil grooves

310 and 410 in which oil flows may be formed on one side or both sides of a surface in which the housing 400 contacts the shell 300.

In other words, the second oil groove 310 may be applied to both the shape having the general structure of the shaft 100 and the fixing part 200 and the structure of the shaft 100 and the fixing part 200 shown in FIGS. 1 to 3.

The

second oil grooves

310 and 410 are formed as the same configuration as the

first oil grooves

110 and 210 but are formed at the outer circumference of the shell 300 or the inner circumference of the housing 400 that is a surface where the shell 300 contacts the housing 400, thereby having lubrication.

The shell 300 is provided with a plurality of second oil supply holes 320 for supplying oil to communicate the outer side and the inner side of the shell 300 with each other.

The

second oil grooves

310 and 410 are formed to include second

axial oil grooves

311 and 411 and second

circumferential oil grooves

312 and 412, similar to the

first oil grooves

110 and 210.

The second

axial oil grooves

311 and 411 are formed in a longitudinal direction of the shell 300 or the housing 400 and are provided in plural at the outer circumference of the shell 300 or the inner circumference of the housing 400. The second

circumferential oil grooves

312 and 412 are formed to surround the outer circumference of the shell 300 and the inner circumference of the housing 400.

The second

circumferential oil grooves

312 and 412 are grooves formed to surround the outer circumference of the shell 300 or the inner circumference of the housing 400 and may be formed in a spiral shape or a circumferential shape.

In more detail, FIG. 6 shows the type of the second oil groove 310 of the shell 300 and FIG. 7 is a diagram showing the type of the second oil groove 410 of the housing 400.

FIG. 6 and 7A show an example where the second

axial oil grooves

311 and 411 of the second oil grooves 301 and 410 and the second

circumferential oil grooves

312 and 412 in a spiral shape are formed, FIG. 6 and 7B show an example where the second

axial oil grooves

311 and 411 of the

second oil grooves

310 and 410 and the two second

circumferential oil grooves

312 and 412 in a spiral shape are formed to intersect with each other, and FIGS. 6 and 7C show an example where the second

axial oil grooves

311 and 411 of the

second oil grooves

310 and 410 and the second

circumferential oil grooves

312 and 412 in a circumferential shape are formed in plural.

The oil film bearing 1000 according to the exemplary embodiment of the present invention prevents the fusion between the shaft 100 and the fixing part 200 and between the shell 300 and the housing 400 by forming the

first oil grooves

110 and 210 or the

second oil grooves

310 and 410, thereby making it possible to shorten the disassembling time and the maintenance time and remarkably increase the process efficiency.

In addition, the oil film bearing 1000 according to the present invention can be used for the rolling mill and can increase the use lifespan even in the environment where the high temperature and the load are present and suppress the generation of carbon due to the oxidation of the oil for lubrication to reduce the checking time and increase the entire rolling production efficiency.

The present invention is not limited to the embodiment described herein and it should be understood that the present invention may be modified and changed in various ways without departing from the spirit and the scope of the present invention. Therefore, it should be appreciated that the modifications and changes are included in the claims of the present invention.

Claims

A structure of fixing a shaft 100, comprising:

shafts 100 formed on both sides of a roll; and

a cylindrical fixing part 200 press-fitted with the shaft 100 to support the shaft 100,

wherein the fixing part 200 is provided with a first oil supplying hole 220 and one side or both sides of a surface where the fixing part 200 contacts the shaft 100 are provided with first oil grooves 110 and 210 in which oil flows.
The structure of fixing a shaft 100 of claim 1, wherein the inner diameter of the fixing part 200 is inclinedly formed to be narrow toward a side into which the shaft 100 is inserted and the shaft 100 is formed to correspond to the shape of the fixing part 200.
The structure of fixing a shaft 100 of claim 2, wherein the first oil grooves 110 and 210 are formed in an insertion direction of the shaft 100 and is formed to include first axial oil grooves 111 and 211 formed in plural at the outer circumference of the shaft 100 or the inner circumference of the fixing part 200 and first circumferential oil grooves 112 and 212 formed to surround the outer circumference of the shaft 100 or the inner circumference of the fixing part 200.
The structure of fixing a shaft 100 of claim 3, wherein the first circumferential oil grooves 112 and 212 are seamlessly formed in a spiral shape.
The structure of fixing a shaft 100 of claim 4, wherein the first circumferential oil grooves 112 and 212 in the spiral shape are formed in at least two to intersect with each other by controlling a formation angle.
The structure of fixing a shaft 100 of claim 3, wherein the first circumferential oil grooves 112 and 212 are formed in a circumferential shape and are formed in plural in the insertion direction of the shaft 100.
An oil film bearing, comprising:

a shaft 100 and a fixing part 200 of any one of claims 1 to 6;

a shell 300 provided at the outer side of the fixing part 200; and

a housing 400 provided at the outer side of the shell 300.
The oil film bearing of claim 7, wherein the oil film bearing 1000 has second oil grooves 310 and 410, in which oil flows, formed on one side or both sides of a surface where the shell 300 contacts the housing 400.
An oil film bearing 1000, comprising:

a housing 400;

a shell 300 provided at the inner side of the housing 400; and

a cylindrical fixing part 200 provided at an inner side of the shell 300 and press-fitted with a shaft 100,

wherein one side or both sides of a surface where the housing 400 contacts the shell 300 are provided with second oil grooves 310 and 410 in which oil flows.
The oil film bearing of claim 9, wherein the second oil grooves 310 and 410 are formed in the longitudinal direction of the shell 300 or the housing 400 and are formed to include second axial oil grooves 311 and 411 formed in plural at the outer circumference of the shell 300 or the inner circumference of the housing 400 and second circumferential oil grooves 312 and 412 formed to surround the outer circumference of the shell 300 or the inner circumference of the housing 400.
The oil film bearing of claim 10, wherein the second circumferential oil grooves 312 and 412 are seamlessly formed in a spiral shape.
The oil film bearing of claim 11, wherein the second circumferential oil grooves 312 and 412 in the spiral shape are formed in at least two to intersect with each other by controlling a formation angle.
The oil film bearing of claim 11, wherein the second circumferential oil grooves 312 and 412 are formed in a circumferential shape and are formed in plural in a longitudinal direction of the shell 300 or the housing 400.