KR102616327B1 - Bearing assembly - Google Patents

Abstract

One embodiment of the present invention is a hollow bearing assembly capable of disposing a shaft of a ventilation system damper on an inner peripheral surface, comprising: a bearing disposed coaxially with the shaft and having a rolling element between the outer ring and the inner ring; It is formed on the inner peripheral surface of the bearing assembly to prevent axial deviation of the inner ring, a middle end (rotating shaft) in contact with the inner peripheral surface of the inner ring, a (rotating shaft) upper cover formed to extend in the radial direction and in contact with the upper part of the inner ring, and a hollow rotating shaft having a lower end (rotating shaft) extending axially to the lower end of the bearing assembly while being spaced apart from the inner ring; a nut for pressurizing and binding the inner ring to the (rotating shaft) upper cover, and simultaneously in contact with the lower end of the inner ring and the outer peripheral surface of the lower (rotating shaft); a housing that forms the outer peripheral surface of the bearing assembly and is in contact with the outer peripheral surface of the outer ring; and a fixing bracket supporting the housing in the axial direction.

Description

Bearing assembly {BEARING ASSEMBLY}

The present invention relates to bearing assemblies.

A bearing is a machine element that limits the relative motion of a desired movement and reduces friction between moving parts. A bearing is a mechanical device (part) that supports a rotating or reciprocating axis at a certain position and allows it to move freely. )am.

In general, the damper of the ventilation system is supported to enable horizontal linear and rotational movement through bearings through a shaft (propulsion shaft) connected to a link. The prior art (KR 1311195 B1) is an oil-free sliding bearing that has the following problems when used for a long time in high temperature facilities (above 200℃) in thermal power plants. 1) Problem of the inner ring (rotating part) in contact with the shaft being separated from the guide ring (a device installed and connected to the insertion groove of the inner ring and the fitting groove of the outer ring) and the outer ring, 2) The bearing housing due to horizontal vibration of the inner and outer rings forward, backward, left and right. and filler pad wear problems, and 3) damage to the vibration-proof rubber packing at the contact area between the bearing inner ring and bearing housing due to high temperature (above 200°C).

Accordingly, a new bearing that can be used for a long time on the shaft (propulsion shaft) connected to the link of the ventilation system damper in thermal power plant high temperature facilities (over 200℃) is required.

The purpose of the present invention is to improve the problem of the bearing inner ring coming off during long-term use due to random stress, such as frequent rotation, translation, and vibration of the shaft (propulsion shaft) connected to the damper of the ventilation system, etc., being transmitted directly to the bearing.

Additionally, the present invention, in one embodiment, aims to provide an axial double row back tapered roller bearing in a bearing assembly.

In addition, the purpose of the present invention is to effectively suppress the condition of the top of the inner ring being separated due to external pressure by pressurizing and binding the bearing inner ring to the upper cover of the rotating shaft.

In addition, the present invention aims to prevent foreign substances from entering the bearing and improve the sealing of grease inside the bearing.

One embodiment of the present invention is a hollow bearing assembly capable of disposing a shaft of a ventilation system damper on an inner peripheral surface, comprising: a bearing disposed coaxially with the shaft and having a rolling element between the outer ring and the inner ring; It forms the inner circumferential surface of the bearing assembly and is intended to prevent axial separation of the inner ring, including the upper end to which the shaft can be attached, the middle part in contact with the inner circumferential surface of the inner ring, and the lower end of the bearing assembly in the axial direction while spaced apart from the inner ring. a hollow rotating shaft having an extended lower end and an upper cover that extends in a radial direction and is in contact with the upper part of the inner ring; a nut for pressurizing and binding the inner ring to the top cover, and simultaneously in contact with the lower end of the inner ring and the lower outer peripheral surface of the rotating body; a housing that forms the outer peripheral surface of the bearing assembly and is in contact with the outer peripheral surface of the outer ring; and a fixing bracket supporting the housing in the axial direction.

The inner ring of the bearing, the rotating shaft, and the nut may form a rotating portion in which the bearing is integrally bound, and the outer ring, the housing, and the fixing bracket of the bearing may constitute a fixed portion in which the bearing is integrally bound, Compared to the fixed portion, the rotating portion may be formed to be capable of moving in the axial direction and/or rotating in the circumferential direction by contact with the shaft of the ventilation system damper.

The bearing may be an axially double row back tapered roller bearing.

The nut includes a plurality of first pressure holes formed in the axial direction at the bottom to enable bolt fastening in order to pressurize and couple the inner ring to the (rotation shaft) upper cover; And in order to pressurize and bind the nut to the lower end of the (rotating shaft), a plurality of second pressing holes formed in the radial direction on the outer circumferential surface and capable of fastening with bolts may be provided.

The housing may be provided with a ring-shaped protrusion at the top at a position corresponding to the groove of the top cover, and the protrusion of the housing may be seated in the groove of the top cover without contact.

The fixing bracket is formed in the axial direction at the bottom to enable bolt fastening in order to securely fasten the housing to the fixing bracket, and is provided with a plurality of through holes spaced apart in the circumferential direction, and the housing has the plurality of holes at the bottom. A plurality of fastening holes formed at positions corresponding to the through holes may be provided.

In the present invention, the inner ring of the bearing is not in direct contact with the shaft (propulsion shaft), but is in contact with the rotating shaft as a medium, and the bearing inner ring, rotating shaft, and nut are provided to be pressurized and fastened as one (rotating part), and the rotating part is integrated. Since stress can be dispersed overall, the problem of separation of the bearing inner ring that occurs during existing long-term use can be improved.

In addition, in the present invention, by applying a double-row back tapered roller bearing within the bearing assembly, both radial and axial loads can be received, and the bearing can be designed to ensure uniform load distribution when mounted and used. there is. In addition, the double-row back-to-back combination can effectively absorb stress by distributing the tilting moment and bidirectional axial load to the upper and lower tapered roller bearings due to the load line diverging toward the bearing axis.

In addition, in the present invention, a thread is formed in the axial direction on the lower outer peripheral surface of the rotating shaft, and the nut is coupled through the thread, so that the inner ring of the bearing and the top cover are pressed together in the axial direction and the problem of the top of the inner ring of the bearing being separated is improved. can do.

In addition, in the present invention, the ring-shaped protrusion provided on the housing is configured to be non-contactly seated in the ring-shaped groove provided at the bottom of one side in the outer peripheral direction (radial direction) of the bearing assembly on the upper cover of the rotating shaft, thereby preventing the intrusion of external foreign substances. And the grease sealing property inside the bearing can be improved.

1 is a cross-sectional schematic diagram showing the front of a bearing assembly according to an embodiment of the present invention.
Figure 2 is a schematic diagram showing the rotation axis, a cross-sectional schematic diagram showing the front of the rotation axis, and a cross-sectional schematic diagram showing the plane of the rotation axis.
Figure 3 is a schematic diagram showing the nut, including a cross-sectional schematic diagram showing the front of the nut and a cross-sectional schematic diagram showing the plane of the nut.
4 is a schematic diagram showing the housing, including a cross-sectional schematic diagram showing the front of the housing and a cross-sectional schematic diagram showing the plane of the housing.
Figure 5 is a schematic diagram showing the fixing bracket, a cross-sectional schematic diagram showing the front of the fixing bracket and a cross-sectional schematic diagram showing the plane of the fixing bracket.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms. The present embodiments only serve to ensure that the disclosure of the present invention is complete and that common knowledge in the technical field to which the present invention pertains is not limited. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used with meanings that can be commonly understood by those skilled in the art in the technical field to which the present invention pertains.

When a part in the entire specification is said to “include” a certain element, this means that it may further include other elements rather than excluding other elements, unless specifically stated to the contrary. The singular also includes the plural, unless specifically stated in the phrase.

In addition, in this specification, when a part such as a layer, membrane, region, part, or plate is said to be “on” or “on” another part, this does not only mean that it is “right on” another part, but also that there is another part in between. Also includes cases where there are.

The present invention provides a bearing assembly according to one embodiment.

1 is a cross-sectional schematic diagram showing the front of the bearing assembly. Referring to Figure 1, the bearing assembly 10 is a hollow bearing assembly 10 on which a shaft (not shown) of a ventilation system damper can be placed on an inner peripheral surface, and includes a bearing 100; Rotation axis (200); nuts (300); housing (400); and a fixing bracket 500.

The bearing assembly 10 may constitute a rotating portion 20 in which the inner ring 110 of the bearing, the rotating shaft 200, and the nut 300 are integrally coupled. On the other hand, a fixing part 30 in which the outer ring 130 of the bearing, the housing 400, and the fixing bracket 500 are integrally coupled can be formed.

In that the rotating part 20 is formed in a state in which the bearing can move in the axial direction, move in the radial direction, and/or rotate in the circumferential direction through contact with the shaft (propulsion shaft) of the ventilation system damper via the rotating shaft, This may be different from the structure in which the bearing (inner ring) and the shaft (propulsion shaft) of the ventilation system damper are in direct contact. On the other hand, the fixing part 30 supports the rotating part in a fixed state at the location where the bearing assembly is installed.

Accordingly, in the past, there was a problem of the inner ring of the bearing coming off due to random stresses such as frequent rotation, translation, and vibration of the shaft (propulsion shaft) being transmitted directly to the bearing. However, in the present invention, ① the inner ring of the bearing does not directly contact the shaft (propulsion shaft). It is a deviation from the existing bearing inner ring in that ② the bearing inner ring, rotating shaft, and nut are pressurized and fastened as one body, and ③ stress can be distributed as a whole to the rotating part that is formed as one body. The problem can be improved.

The bearing 100 is one of machine elements that limits relative movement to a desired movement and reduces friction between moving parts. In particular, in the present invention, ventilation can be placed on the inner peripheral surface of the hollow bearing assembly. This is to limit random relative movements such as rotation, translation, and vibration of the shaft (propulsion axis) of the system damper and reduce friction resulting from this. Referring to FIG. 1, the bearing is arranged coaxially with the shaft, and a rolling element 120 is provided between the outer ring 130 and the inner ring 110.

For example, the bearing 100 may be an axial double row back tapered roller bearing. Specifically, it is preferable to use a back-to-back tapered roller bearing that is composed of double rows at the top and bottom of the bushing 140 disposed in the radial direction and has an obtuse angle. The damper of the ventilation system is supported to enable horizontal linear and rotational movement through a bearing through a shaft (propulsion shaft) connected to the link. The bearing of the double-row back combination is subject to a tilting moment and a load line diverging toward the bearing axis. It is effective in absorbing stress by distributing the two-way axial load to the upper and lower tapered roller bearings.

Referring to Figures 1 and 2, the rotation shaft 200 is formed on the inner peripheral surface of the bearing assembly to prevent axial deviation of the inner ring, and the rotation shaft 200 has an upper end (rotation shaft) to which the shaft can be attached. (210), a (rotation shaft) middle 220 in contact with the inner peripheral surface of the inner ring, and a lower end (230) of the (rotation shaft) extending axially to the lower end of the bearing assembly while spaced apart from the inner ring, and extending in the radial direction, and A top cover (240) of the (rotation axis) contacting the upper part of the inner ring is provided.

The upper end 210 of the rotating shaft forms the inner peripheral surface of the bearing and extends in the axial direction to the upper end of the bearing assembly. The inner peripheral surface of the upper end is in contact with the outer peripheral surface of the shaft, and the outer peripheral surface of the upper end is exposed to the outside of the bearing assembly. The upper end of the rotating shaft may be provided with a fastening hole 211 formed in the radial direction for fastening to the shaft through a fixing pin. The fastening hole 211 may be formed in the shape of a cylindrical through hole, but can be applied without particular limitations as long as the fixing pin can be fastened to the through hole of the shaft formed at the corresponding position.

The middle 220 of the rotating shaft forms the inner peripheral surface of the bearing assembly together with the upper end of the rotating shaft 210. The outer peripheral surface of the middle middle is in contact with the inner peripheral surface of the inner ring, and the inner peripheral surface of the middle middle is in contact with the outer peripheral surface of the shaft. The problem of separation of the existing bearing inner ring can be improved in that the inner ring of the bearing is not directly in contact with the shaft (propulsion shaft) but is joined with the middle of the rotating shaft as a medium.

The lower end 230 of the rotating shaft forms the inner circumferential surface of the bearing assembly together with the upper end 210 and the middle portion 220 of the rotating shaft, and extends in the axial direction to the lower end of the bearing assembly to be spaced apart from the inner ring. , the inner peripheral surface of the lower end of the rotating shaft is in contact with the outer peripheral surface of the shaft, and the outer peripheral surface of the lower end of the rotating shaft is in contact with the inner peripheral surface of the nut. Previously, the rotation area due to stress from the shaft was limited to the inner ring of the bearing, causing problems with the upper part of the bearing due to horizontal and axial vibration and movement. Accordingly, in the present invention, the entire inner peripheral surface of the bearing assembly is a rotating part integrally formed, and is in contact with the shaft to increase stress distribution and load distribution and improve the problem of the top of the bearing coming off.

The (rotating shaft) lower end 230 may have threads formed on its outer peripheral surface in the axial direction in order to pressurize and bind the inner ring of the bearing to the upper cover 240 in the axial direction. The nut can be joined through the thread and the bearing inner ring and top cover can be pressed in the axial direction.

The (rotation shaft) upper cover 240 is designed to prevent foreign substances from entering the bearing and to seal the interior, and may be formed to extend in the radial direction and be in contact with the upper part of the inner ring. The top cover 240 may be provided with a ring-shaped groove 241 at the bottom of one side in the direction (radial direction) of the outer peripheral surface of the bearing assembly. The ring-shaped groove is a groove shape recessed in the axial direction and may be provided to enable non-contact seating (in the axial direction) with the ring-shaped protrusion 410 of the housing. Accordingly, it can play a role in preventing the intrusion of external foreign substances and sealing the grease inside the bearing.

Referring to Figures 1 and 3, the nut 300 is formed in the axial direction at the bottom in order to pressurize the inner ring 110 to the (rotation shaft) upper cover 240 and has a plurality of first bolts capable of fastening. Pressure hole (310); And in order to pressurize and bind the nut 300 to the lower end 230 of the (rotation shaft), a plurality of second pressure holes 320 are formed on the outer peripheral surface in the radial direction and can be fastened with bolts. .

Accordingly, the nut 300 is fastened along a thread formed axially at the bottom 230 of the (rotation axis), and as an example, the nut 300 is formed axially at the bottom of the nut 300 and rotates 90° in the circumferential direction. By fastening the four first pressure holes 310 formed at intervals with screw bolts, the condition of the inner ring top being separated due to external pressure can be effectively suppressed. As another example, the four second pressure holes 320 formed radially on the outer peripheral surface of the nut at 90° intervals in the circumferential direction are fastened with screw bolts to form an inner ring due to front, rear, left and right loads and stresses. The horizontal departure condition can be effectively suppressed.

Meanwhile, it is preferable in terms of stress distribution and load distribution when the plurality of first pressure holes and the plurality of second pressure holes are formed at equal intervals in the circumferential direction (circumferential direction), respectively. For example, when a nut is provided with four first and second pressure holes each, the distance between adjacent pressure holes may be formed at a constant angle of 45°, but the present invention is not limited thereto (see FIG. 3).

Referring to Figures 1 and 4, the housing 400 forms the outer peripheral surface of the bearing assembly 10, the inner peripheral surface is in contact with the outer peripheral surface of the outer ring 130, and the lower portion is axially moved by the fixing bracket 500. It may be formed to be supported by.

The housing 400 may be provided with a ring-shaped protrusion 410 at the top at a position corresponding to the groove of the top cover, and the protrusion of the housing may be seated in the groove 241 of the top cover without contact. . Accordingly, it may be possible to prevent external foreign substances from entering and seal the grease inside the bearing. Additionally, the housing 400 may be provided with an oil supply hole 420 in the radial direction to enable oil supply into the bearing. In addition, the housing 400 has a plurality of fastening holes 430 formed in the axial direction at the bottom for the purpose of being fixedly fastened by the fixing bracket and at positions corresponding to the plurality of through holes of the fixing bracket. It can be provided.

Referring to FIGS. 1 and 5, the fixing bracket 500 is used to fix the bearing assembly to the ground (installation site) and to support the rotating part in which the bearing inner ring, the rotating shaft, and the nut are integrated, and the bearing assembly 10 ), the inner peripheral surface is in contact with the outer peripheral surface of the nut 300, the lower portion supports the housing 400 in the axial direction, and the outer peripheral surface may be formed to be exposed to the outside of the bearing assembly 10.

The fixing bracket 500 may be formed so that the lower thread of the rotation axis to which the nut 300 is coupled to the inner peripheral surface (inside) of the fixing bracket is maintained in radial balance with the fixing bracket. Accordingly, the nut can be supported in the radial direction and further improves the suppression of the horizontal deviation condition of the inner ring due to the front, rear, left and right loads and stress, which is an effect that occurs when the screw bolt is fastened to the second pressure hole 320 of the nut. There is a side.

In addition, the fixing bracket 500 has a plurality of through holes 510 formed axially at the bottom and spaced apart in the circumferential direction to enable bolt fastening for the purpose of fixing the housing 400 to the fixing bracket. It can be provided. In addition, the fixing bracket 500 is formed axially at the bottom to enable bolt fastening in order to fix the bearing assembly 10 to the ground (installation site) and may be provided with a plurality of fixing holes 520 spaced apart from each other. .

In the bearing assembly provided by one embodiment of the present invention, random stresses such as frequent rotation, translation, and vibration of the shaft (propulsion shaft) connected to the damper of the ventilation system and the link are transmitted directly to the bearing, causing the bearing inner ring to break when used for a long time. In order to improve the problem of separation, the inner ring of the bearing is not in direct contact with the shaft (propulsion shaft), but is in contact with the rotating shaft as a medium, and the bearing inner ring, rotating shaft, and nut are equipped to be pressurized and fastened as one (rotating part). , in that stress can be distributed throughout the integrated rotating part, the problem of separation of the bearing inner ring that occurs during existing long-term use can be improved.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be manufactured in various different forms, and those skilled in the art will understand the technical idea of the present invention. It will be understood that it can be implemented in other specific forms without changing the essential features. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive.

10: Bearing assembly
20: rotating part 30: fixed part
100: bearing 110: inner ring
120: rolling element 130: outer ring
140: Bushing 200: Rotating shaft
210: (rotation axis) top 211: fastening hole
220: (rotation axis) middle 230: (rotation axis) bottom
240: (rotation axis) top cover 241: (top cover) groove
300: Nut 310: First pressure hole
320: second pressure hole 400: housing
410: (Housing) Protrusion 420: Oiling hole
430: fastening hole 500: fixing bracket
510: through hole 520: fixed hole
S: Shaft (propulsion axis)

Claims (6)

A hollow bearing assembly capable of placing the shaft of a ventilation system damper on the inner peripheral surface,
a bearing disposed coaxially with the shaft and having a rolling element between the outer ring and the inner ring;
It forms the inner circumferential surface of the bearing assembly and is intended to prevent axial separation of the inner ring, including the upper end to which the shaft can be attached, the middle part in contact with the inner circumferential surface of the inner ring, and the lower end of the bearing assembly in the axial direction while spaced apart from the inner ring. An upper cover that extends in the radial direction of the bearing assembly to surround the extended lower end and the top of the inner and outer rings of the bearing, is in contact with the upper part of the inner ring, and has a ring-shaped groove formed at the lower end of one side in the radial direction of the bearing assembly, A hollow rotating shaft provided with;
It is in contact with the lower end of the inner ring and the lower outer peripheral surface of the rotating shaft simultaneously, and is used to pressurize and bind the inner ring to the top cover. A plurality of first pressure holes are formed in the axial direction and are bolted to the inner ring, and a nut is connected to the lower end of the rotating shaft. a nut formed in the radial direction on the outer circumferential surface and provided with a plurality of second pressure holes bolted to the rotation shaft;
A housing that forms the outer peripheral surface of the bearing assembly, is in contact with the outer peripheral surface of the outer ring, and has a ring-shaped protrusion at the top at a position corresponding to the groove of the upper cover, so that the protrusion is seated in the groove of the upper cover without contact; and
Consisting of a fixing bracket that supports the housing in the axial direction
A bearing assembly characterized by a. According to paragraph 1,
The inner ring of the bearing, the rotating shaft, and the nut constitute a rotating portion integrally coupled, and the outer ring of the bearing, the housing, and the fixing bracket constitute a fixed portion integrally coupled,
The rotating part is formed to be capable of moving in the axial direction and/or rotating in the circumferential direction by contact with the shaft of the ventilation system damper, when compared to the fixed part.
A bearing assembly characterized by a. According to paragraph 1,
The bearing is a double row back tapered roller bearing in the axial direction.
A bearing assembly characterized by a. delete delete According to paragraph 1,
The fixing bracket is,
In order to securely fasten the housing to the fixing bracket, a plurality of through holes are formed in the axial direction at the bottom to enable bolt fastening and are spaced apart in the circumferential direction,
The housing is provided with a plurality of fastening holes formed at positions corresponding to the plurality of through holes at the bottom.
A bearing assembly characterized by a.