KR20200084590A - Bearing with a threaded pin hole - Google Patents

Abstract

The present invention relates to a bearing having a threaded pin hole, which comprises: a cylindrical housing; and a pin hole provided on the outer peripheral surface of the housing. A thread is formed on the inner peripheral surface of the pin hole. According to the present invention, it is possible to easily install and remove a rotation prevention pin by screwing the rotation prevention pin into the pin hole provided with the thread. In addition, the rotation prevention pin may be provided, in which an inner part is reinforced with a tension member and a coupling force is reinforced with a pressure member according to a load applied to the bearing.

Description

Bearing with threaded pinholes {BEARING WITH A THREADED PIN HOLE}

The present invention relates to a bearing having a pinhole formed with a thread, and more particularly, to a bearing capable of securing ease when installing or removing the anti-rotation pin by screwing the anti-rotation pin and the pin hole. .

A bearing is a device that supports the load of the rotating shaft in a turbo device including a compressor, pump, turbine, and the like, but helps to smoothly rotate the rotor by minimizing friction with the rotating shaft. .

The inner circumferential surface of the bearing and the rotating shaft are installed in contact or in close proximity. In this case, the bearing must be fixed at a certain position in order to perform the role of supporting the load of the rotating shaft despite the relative motion with the rotating shaft rotating at high speed.

1 is a view showing a conventional method of installing an anti-rotation pin on a tilting pad bearing.

Referring to FIG. 1, the anti-rotation pin 13 provided on one surface of the housing 11 serves to fix the position of the bearing 10. In general, when the bearing 10 is installed in a gear box, the bearing 10 is seated so that the anti-rotation pin 13 can be caught in a pin slot, which is a groove formed inside the gear box. Therefore, the installation angle of the bearing 10 is determined by the position of the anti-rotation pin 13. In addition, the anti-rotation pin 13 is installed in the form of a pin slot, which is a groove inside the gear box, and even if the bearing 10 receives rotational force from the rotation shaft, the anti-rotation pin 13 is fixed inside the gear box. The bearing 10 does not rotate.

Conventionally, the anti-rotation pin 13 was coupled to the pinhole 12 in an interference-fitting manner. In particular, by heating the pinhole 12 or the anti-rotation pin 13 to a high temperature, one end of the anti-rotation pin is introduced into the pinhole 12, and the pinhole 12 and the anti-rotation pin 13 are cooled while the pinhole 12 is cooled. The heat-fitting (or shrink fit) method, which shrinks and secures an airtight bond between the two, was mainly used.

When combined by a heat-fitting method, the coupling force between the pinhole 12 and the anti-rotation pin is excellent, so that both rotate integrally and there is no room for relative motion. However, the anti-rotation pin 13 coupled by heat fitting has a disadvantage that it cannot be disassembled without damaging the housing 11 or the anti-rotation pin 13 of the bearing 10.

The problem to be solved by the present invention is to provide a bearing capable of easily installing and removing the anti-rotation pin by having a pinhole formed with a screw thread in the housing.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

A bearing having a pinhole formed with a thread according to an embodiment of the present invention for solving the above problems includes a cylindrical housing having an inner circumferential surface of a hollow shape in an axial direction; At least one support member accommodated in the housing and disposed along the inner circumferential surface; And a pin hole provided on one side of the outer peripheral surface of the housing and having a thread formed therein.

In addition, further comprising a rotation prevention pin, a thread is formed in an area corresponding to the pinhole on an outer circumferential surface of the rotation prevention pin so that the rotation prevention pin may be screwed to the pinhole.

In addition, further comprising a tension member, an anti-rotation pin, and a pressing member, a thread is formed on an outer circumferential surface of the tension member, and the anti-rotation pin has upper and lower ends of the anti-rotation pin along the central axis of the anti-rotation pin. A through hole having a thread formed on an inner circumferential surface, the pressing member has a screw hole therein along the central axis of the pressing member, one end of the tension member is screwed to the pin hole, and coupled to the pin hole The anti-rotation pin is screwed to the tension member through the through hole, and at the top of the anti-rotation pin coupled to the tension member, the pressing member is screwed to the other end of the tension member to the anti-rotation pin. Pressure can be applied.

Other specific matters of the present invention are included in the detailed description and drawings.

According to embodiments of the present invention has at least the following effects.

In the bearing according to the present invention, the pinhole formed in the housing and the anti-rotation pin are coupled by screwing, so that the anti-rotation pin can be easily installed.

In addition, when the position of the anti-rotation pin needs to be changed, the bearing according to the present invention can easily remove a pre-installed anti-rotation pin, and after forming a new pinhole by tapping the outer peripheral surface of the housing, prevent rotation. You can reinstall the pin.

In addition, the bearing according to the present invention, when the radius of the bearing and the load applied to the bearing is large, the tensile member and the pressing member are additionally used to reinforce the strength of the anti-rotation pin and to strengthen the coupling force between the anti-rotation pin and the housing. Can.

1 is a perspective view of a bearing in which an anti-rotation pin is coupled to a pinhole by a conventional interference fit method.
2 is a perspective view of a bearing having a threaded pinhole according to an embodiment of the present invention.
3 is a view showing a screw coupling relationship between the anti-rotation pin and the pinhole according to an embodiment of the present invention.
4 is a perspective view of a bearing in which a rotation preventing pin according to another embodiment of the present invention is coupled to a pinhole through a tension member.
Figure 5 (a) is an exploded perspective view showing the coupling relationship between the pinhole and the tension member, the rotation prevention pin, the pressing member according to another embodiment of the present invention.
Figure 5 (b) is a cross-sectional view showing the coupling relationship between the pinhole and the tension member, the rotation prevention pin, the pressing member according to another embodiment of the present invention.
Figure 6 (a) is a perspective view showing a state in which the rotor is installed a bearing according to an embodiment of the present invention is mounted on a gear box.
6(b) is an enlarged view of a pin slot in which the anti-rotation pin is seated according to an embodiment of the present invention.
7 is a view showing a bearing capable of disassembly and reinstallation of the anti-rotation pin according to another embodiment of the present invention.

Advantages and features of the present invention, and a method of achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains. It is provided to fully inform the person having the scope of the invention, and the present invention is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used as meanings commonly understood by those skilled in the art to which the present invention pertains. In addition, terms defined in the commonly used dictionary are not ideally or excessively interpreted unless specifically defined.

The terminology used herein is for describing the embodiments and is not intended to limit the present invention. In the present specification, the singular form also includes the plural form unless otherwise specified in the phrase. As used herein, “comprises” and/or “comprising” does not exclude the presence or addition of one or more other components other than the components mentioned.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The bearing can be classified into a sliding bearing and a rolling bearing according to a contact method, and can be classified into a radial bearing, a thrust bearing, and a taper bearing according to a load direction. The journal means a portion of the shaft in contact with the bearing, and the journal bearing means a bearing that supports the journal.

According to the classification of the contact method, a rolling bearing is a bearing having a rolling element such as a ball or roller between the journal and the bearing, supporting the load of the shaft by the contact pressure to the rolling element. On the other hand, the sliding bearing is a bearing that does not have a rolling element between the journal and the bearing and supports the load by fluid pressure or the like. The sliding bearing may support the load of the rotating shaft by the pressure of the oil film by injecting lubricant as an intermediate medium, or may support the load by using magnetic force. At this time, the sliding bearing using lubricant is called a hydrodynamic journal bearing.

A type of hydrodynamic journal bearing is a tilting pad bearing. The tilting pad bearing is a bearing comprising a plurality of prefabricated pads, and when operated, oil flows into the pad surface to form a thin, compressed film. The load of the rotating shaft is supported by the formed oil film, and the pad is slightly inclined according to the load applied to the oil film. The inclination of the pad changes according to the load applied to the bearing and the speed of the rotating shaft. The tilting pad bearing can prevent vibration of the bearing by moving the pad according to the rotation of the rotating shaft and the pressure gradient of the oil film. Therefore, the tilting pad bearing can be used in a large turbo device in which the rotor speed is high and a large load is applied to the bearing. In particular, the use of a tilting pad bearing improves the stability of the shaft, and thus can be mainly used for large turbines, etc., where the bearing load of the shaft alignment fluctuates greatly.

According to the classification of the load direction, the radial bearing is a bearing that supports a load in the direction perpendicular to the axis, the thrust bearing is a bearing that supports the load in the axial direction, and the tapered bearing is a load in the direction axial and perpendicular to the axis. It is a bearing that simultaneously supports.

The bearing having the pinhole formed with the thread of the present invention can be applied to all kinds of bearings described above. The bearings of FIGS. 1 to 7 illustrate a tilting pad bearing according to an embodiment of the present invention, but are not limited thereto.

2 is a perspective view of a bearing having a threaded pinhole according to an embodiment of the present invention. 3 is a view showing a screw coupling relationship between the anti-rotation pin and the pinhole according to an embodiment of the present invention.

Referring to FIG. 2, the bearing 100 of the present invention is accommodated in the housing 110 of a cylindrical shape having a hollow inner circumferential surface 160 in the axial direction, and the housing 110 and disposed along the inner circumferential surface 160 It may include at least one or more support members 161 and pin holes 120 provided on one side of the outer circumferential surface of the housing 110 and having threads formed therein.

The housing 110 of the bearing 100 may be formed of a material having sufficient rigidity to support the load of the rotating shaft rotating at high speed, and may be formed of metal. The housing 110 is formed in a cylindrical shape having a hollow inner circumferential surface 160 so that the rotating shaft can penetrate. The housing 110 may be formed of a single body or divided into upper and lower parts. When the housing 110 is divided into upper and lower parts, the bearing 110 can be replaced by separating the housing 110 without dismantling the rotor. Therefore, there is an advantage that the bearing can be quickly and easily replaced when the bearing operates abnormally.

At least one support member 161 of the bearing 100 of the present invention may be disposed along the inner circumferential surface 160 of the bearing 100 inside the housing 110. The bearing 100 may have a hollow inner circumferential surface 160 so that the rotating shaft can be supported through the bearing 100, and the support member 161 disposed on the inner circumferential surface 160 contacts or faces the rotating shaft. It can serve to support the rotating shaft. The support member 161 may be provided with at least one or more, and may be formed of a ball, a roller, a needle, a tilting pad or a lubricated friction surface according to the type of bearing.

The bearing 100 of the present invention may include a pinhole 120 provided on one side of the outer circumferential surface of the housing 110 in order to engage the anti-rotation pin 130. A thread is formed on the inner circumferential surface of the pinhole 120, so that the ease of operation can be secured when the anti-rotation pin 130 is coupled to the pinhole.

A tapping process may be performed to form a pinhole 120 having a thread formed on an outer circumferential surface of the housing 110 formed of metal. Tapping refers to machining of a female thread using a tap, which is a tool for machining threads. It is possible to secure the ease of forming the pinhole 120 by tapping. A rotation preventing pin 130 to be described later may be screwed to the pinhole 120 formed through tapping.

Referring to FIG. 3, the bearing of the present invention further includes an anti-rotation pin 130, but a thread is formed in an area corresponding to the pin hole 120 on an outer circumferential surface of the anti-rotation pin 130 to prevent the anti-rotation pin. 130 may be screwed to the pinhole 120.

As described above, a thread may be formed at the bottom of the anti-rotation pin 130. The screw thread is formed on the outer circumferential surface of the anti-rotation pin 130 and may be formed in an area where the anti-rotation pin 130 is coupled to the pin hole 120. The region where the thread of the anti-rotation pin 130 is formed may have a cylindrical shape for screwing with the pinhole 120. However, the region where the thread of the anti-rotation pin 130 is not formed may be formed in a column shape of various shapes such as a square column, a pentagonal column, and a hexagonal column, as well as a column.

The anti-rotation pin 130 may be formed of a material having sufficient rigidity to resist the rotational force transmitted from the rotation axis, and may be formed of metal.

The anti-rotation pin 130 can be easily installed in the pin hole 120 by the combination of the lower end of the anti-rotation pin 130 and the threads formed inside the pin hole 120. In addition, by releasing the coupling between the anti-rotation pin 130 and the pinhole 120, the anti-rotation pin 130 can be easily removed.

4 is a perspective view of a bearing in which a rotation preventing pin according to another embodiment of the present invention is coupled to a pinhole through a tension member. Figure 5 (a) is an exploded perspective view showing the coupling relationship between the pinhole and the tension member, the anti-rotation pin, and the pressing member according to another embodiment of the present invention, Figure 5 (b) is a pinhole and the tension member, anti-rotation pin, pressurization It is a sectional view showing the coupling relationship of the members.

4, the bearing 100 of the present invention further includes a tension member 140, a rotation preventing pin 130, and a pressing member 150, but a thread is formed on an outer circumferential surface of the tension member 140. , The anti-rotation pin 130 is provided with a through-hole 131 through which threads are formed on an inner circumferential surface while penetrating the upper and lower ends of the anti-rotation pin 130 along the central axis of the anti-rotation pin 130. The pressing member 150 has a screw hole therein along the central axis of the pressing member 150, one end of the tension member 140 is screwed to the pin hole 120, and coupled to the pin hole 120 The anti-rotation pin 130 is screwed to the tension member 140 through the through hole 131, and at the top of the anti-rotation pin 130 coupled to the tension member 140, the pressing The member 150 is screwed to the other end of the tension member 140 to apply pressure to the anti-rotation pin 130.

The load applied to the bearing 100 is determined according to specifications such as the power of the motor and the rotational speed of the rotor, whereby the radius of the bearing 100 is also determined. When the rotor rotates at high speed and the radius of the rotating shaft is large, the design radius of the bearing 100 also increases. At this time, the anti-rotation pin 130 should be designed to be able to resist a larger rotational force. Therefore, the anti-rotation pin 130 may further include a tension member 140 and a pressing member 150 to improve the bonding force with the housing 110.

5(a) and 5(b), one end of the tension member 140 having a thread formed on an outer circumferential surface may be screwed to a pinhole 120 formed in the housing 110. The tension member 140 may use a tie bolt or the like.

The anti-rotation pin 130 may be screwed to the tension member 140 coupled to the pinhole 120. The anti-rotation pin 130 has a column shape, and may include a through hole 131 penetrating the upper and lower ends of the anti-rotation pin 130. The through hole 131 is formed along the central axis of the anti-rotation pin 130. A thread may be formed on the inner circumferential surface of the through-hole 131 to be screwed with the tension member 140. The through-hole 131 must be screwed with a tension member 140 such as a tie bolt to be formed in a cylindrical shape, but the anti-rotation pin 130 has a columnar shape, such as a square column, a pentagonal column, as well as a column. It can be formed as. The anti-rotation pin 130 is coupled to the tension member 140 so that the lower end of the anti-rotation pin 130 contacts the outer circumferential surface of the housing 110.

At the top of the anti-rotation pin 130 coupled to the housing 110 through the tension member 140, the pressing member 150 can be coupled to the tension member 140. The pressing member 150 may be screwed to the tension member 140 by having a screw hole therein. The pressing member 150 may use a nut, a nut cap, or the like. In the case of a nut, the screw hole is formed through the upper and lower ends of the pressing member 150, and in the case of a nut cap, the screw hole is formed from the lower end of the pressing member 150 toward the inside. The screw hole may be formed along the central axis of the pressing member 150.

Both the nut and the nut cap are screwed to the tension member 140 to apply pressure to the anti-rotation pin 130. When using a nut, the upper part of the tension member 140 is exposed, whereas when using a nut cap, the tension member 140 is coupled inside the nut cap so that the top of the tension member 140 is not exposed. Therefore, when the nut cap is used, the tension member 140 is prevented from colliding with the gear box 200 when the force is applied to the rotation preventing pin 130 seated on the gear box 200. ) Can improve the durability.

The pressing member 150, by placing the anti-rotation pin 130 between the housing 110 and screwing with the tension member 140, generates a tensile force on the tension member 140, the anti-rotation pin ( 130) is a configuration that generates a compressive force as a reaction to this. The coupling force between the anti-rotation pin 130 and the housing 110 may be enhanced by a compressive force in the direction of the housing 110 applied to the anti-rotation pin 130. Accordingly, by compressing the pressing member 150 on the tension member 140 until the pressing member 150 can no longer move downward, it is possible to enhance the compressive force generated in the anti-rotation pin 130.

As described above, by additionally using the tension member 140 and the pressing member 150, the bonding force between the anti-rotation pin 130 and the housing 110 can be improved, and the tension member 140 can be used for iron or the like. By using a high-strength material, the strength inside the anti-rotation pin 130 may be improved. Therefore, when compared to the method of coupling only the anti-rotation pin 130 to the pinhole 120, when the anti-rotation pin 130 is further installed using the tension member 140 and the pressing member 150, the load and rotation speed of the rotor It can be stably prevented by the rotation of the bearing 100 even in a large turbo device having a large size.

Figure 6 (a) is a perspective view showing a state in which the rotor is installed with a bearing according to an embodiment of the present invention is mounted on the gearbox, Figure 6 (b) is a rotation prevention pin according to an embodiment of the present invention seated It is an enlarged view of the pin slot.

The rotor of the turbo device is a pinion gear 300 receiving rotational power from a bull gear, a pinion gear 300 connected to the pinion gear 300, and a rotation shaft 500 rotating with the pinion gear 300, and one end of the rotation shaft 500 It is coupled to the rotating shaft 500 includes an impeller 400 that rotates with. The bull gear and pinion gear 300 is installed inside a gear box (200) or a casing, and a hole through which the rotation shaft 500 can pass through the front and/or rear of the gear box 200. It is formed. At this time, the bearing 100 coupled with the rotating shaft 500 between the pinion gear 300 and the impeller 400 is installed in the hole formed in the gear box 200. The bearing 100 prevents contact between the rotating shaft 500 rotating at high speed and the gearbox 200, and serves to support the load of the rotating shaft 500. In addition, although the method differs depending on the sliding bearing and the rolling bearing, the frictional force between the rotating shaft 500 is relaxed to help smooth rotation of the rotating shaft 500.

The gearbox 200 is divided into upper and lower parts, and after installing a gear device in the lower gearbox 200, the upper gearbox 200 is coupled to secure ease of installation. When the rotor is installed in the lower gearbox 200, the pinion gear 300 is positioned inside the gearbox 200, and the rotor 500 is placed in a hole formed in the gearbox 200 to penetrate the rotary shaft 500. The combined bearing 100 can be positioned. A pin slot (210) is formed at an upper end of the lower gear box (200), and the pin slot (210) is a groove formed adjacent to a hole through which the bearing (100) is mounted. Therefore, when the bearing 100 is mounted in a hole formed in the gearbox 200, the anti-rotation pin 130 may be mounted in the pin slot 210. After the rotor is mounted on the lower gearbox 200 by the above method, by combining the upper gearbox 200 with the lower gearbox 200, the rotation prevention pin 130 moves between the upper and lower gearboxes 200. Can be prevented

The pin slot 210 may be formed in various forms in which the anti-rotation pin 130 can be mounted. However, when the pin slot 210 is formed in a form that minimizes the separation between the pin slot 210 and the anti-rotation pin 130, the anti-rotation effect on the bearing 100 may be maximized.

The pin slot 210 may be formed only at the top of the lower gearbox 200, as long as it is formed in a form that does not allow the position change of the anti-rotation pin 130, the upper and upper gears of the lower gearbox 200 All of them may be formed at the bottom of the box 200. In addition, it is also possible to form the pin slot 210 only at the bottom of the upper gear box 200. However, when the pin slot 210 is formed only on the top of the lower gear box 200, the ease of manufacturing the gear box 200 and the ease of mounting the bearing 100 may be improved.

7 is a view showing a bearing capable of disassembly and reinstallation of the anti-rotation pin according to another embodiment of the present invention.

The angle of the load applied to the bearing 100 is determined by the rotational speed of the rotor, the size and weight of the gear, the radius of the rotating shaft 500, and the like. Accordingly, the load of the bearing 100 is concentrated at a specific position according to the continuous driving of the turbo device, so that the durability of the bearing 100 may be deteriorated. In particular, in the case of a tilting pad bearing, abnormal operation of a specific pad where a load is concentrated may be caused.

This problem can be solved by removing the pre-installed anti-rotation pin 130 and reinstalling the anti-rotation pin 130 to a new location. When the position of the anti-rotation pin 130 is changed, the angle of the load applied to the bearing 100 is not changed, but the angle at which the bearing 100 is seated on the gearbox 200 is changed, so that the inside of the bearing 100 is changed. This is because the location where the concentrated load is changed.

When the anti-rotation pin 130 is installed in a conventional heat-fitting method, the housing 110 and the anti-rotation pin 130 of the bearing 100 are coupled using thermal expansion and thermal contraction of metal, so the anti-rotation pin 130 ) Or the anti-rotation pin 130 cannot be removed without damaging the housing 110 of the bearing 100. Therefore, the position of the anti-rotation pin 130 cannot be changed.

However, the bearing 100 having the pinhole 120 in which the thread of the present invention is formed can easily remove the anti-rotation pin 130 by loosening the screw connection between the pinhole 120 and the anti-rotation pin 130. . In addition, the bearing 100 of the present invention can be easily provided with an additional pinhole 120 through tapping. Therefore, by forming an additional pinhole 120 in the bearing 100 in use and screwing the existing anti-rotation pin 130 into the new pinhole 120, the installation angle of the bearing 100 can be easily changed.

By changing the position of the anti-rotation pin 130 as described above, it is possible to prevent serious damage to the bearing 100 by changing a position where a concentrated load is applied inside the bearing 100. In addition, when a slight breakage occurs in a portion of the bearing 100, the normal operation of the bearing 100 may be induced without replacing the bearing 100 itself. This is because the problem may be solved by changing the position of the anti-rotation pin 130 so that the tilting pad in normal operation receives a concentrated load when the tilting pad bearing has an abnormal operation, for example. As such, the bearing 100 of the present invention can improve the durability of the bearing 100 by securing the ease of installation and removal of the anti-rotation pin 130, and can extend the operating life of the bearing 100.

Those of ordinary skill in the art to which the present invention pertains will appreciate that the present invention may be implemented in other specific forms without changing its technical spirit or essential features. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the following claims rather than the above detailed description, and it should be interpreted that all changes or modified forms derived from the meaning and scope of the claims and equivalent concepts thereof are included in the scope of the present invention. do.

100: bearing 110: housing
120: pinhole 130: anti-rotation pin
131: through-hole 140: tension member
150: pressing member 160: inner peripheral surface of the bearing
161: support member 200: gearbox
210: pin slot 300: pinion gear
400: impeller 500: rotating shaft

Claims (3)

A cylindrical housing having an inner circumferential surface in the axial direction;
At least one support member accommodated in the housing and disposed along the inner circumferential surface; And
A bearing provided on one side of the outer circumferential surface of the housing and having a threaded pinhole therein. According to claim 1,
Further comprising an anti-rotation pin,
On the outer circumferential surface of the anti-rotation pin, a thread is formed in an area corresponding to the pin hole, so that the anti-rotation pin is screwed to the pin hole. According to claim 1,
Further comprising a tension member, anti-rotation pin and the pressing member,
A thread is formed on the outer peripheral surface of the tension member,
The anti-rotation pin has a through-hole formed with a thread on an inner circumferential surface, penetrating the top and bottom of the anti-rotation pin along the central axis of the anti-rotation pin,
The pressing member has a screw hole therein along the central axis of the pressing member,
One end of the tension member is screwed to the pinhole,
The anti-rotation pin is screwed to the tension member coupled to the pinhole through the through hole,
At the top of the anti-rotation pin coupled to the tension member, the pressing member is screwed to the other end of the tension member to apply pressure to the anti-rotation pin.

Images