JP6384333B2 - Plummer block bearing - Google Patents

Description

  The present invention relates to a plummer block bearing. More specifically, the present invention relates to a plummer block bearing in which a radial bearing that rotatably supports a rotating shaft is installed inside a bearing box in which lubricating oil can be retained.

  As an example of a specific embodiment of the plummer block bearing, for example, a bearing used as a pinion gear bearing for driving a rotary kiln operating in a non-ferrous smelting facility or the like can be cited.

  The plummer block bearing is, for example, a radial bearing such as a self-aligning roller bearing that is installed inside a metal bearing box, and thereby supports a rotating shaft rotatably (see Patent Document 1). And the plummer block bearing is usually formed with an oil supply port for injecting lubricating oil into any part of the upper surface of the bearing box (see Patent Document 2). And the smoothness of rotation of a rotating shaft is maintained by always adjusting the quantity of the lubricating oil which stays in the inside of a bearing box in the appropriate amount range (refer patent document 3).

  In order to always keep the lubricating oil retained in the plummer block bearing within the appropriate range, in addition to injecting a predetermined amount of lubricating oil at the time of assembly as a new product, the appropriate amount of oil during the subsequent operation is also appropriately selected. An additional amount of refueling is required.

  Here, in many plummer block bearings, as described in Patent Document 2, the oil filler opening is installed immediately above the radial bearing. In this case, there is a merit that it is easy to supply the lubricating oil preferentially and efficiently to the radial bearing requiring the action of the lubricating oil and its peripheral portion.

  On the other hand, in a plummer block bearing in which an oil filler port is installed immediately above a radial bearing, the radial bearing and its peripheral members may reach extremely high temperatures during operation due to some sudden cause. Therefore, if the oil filler port is installed directly above the radial bearing, additional oiling work cannot be started until the high-temperature radial bearing, etc. is sufficiently cooled. As a result, there arises a problem that productivity of a production facility using the plummer block bearing is lowered.

Japanese Utility Model Publication No. 6-47733 JP-A-8-159163 JP 2009-79693 A

In view of the above circumstances, during operation of the Plummer block bearings, shorten the time required for additional lubrication work for the maintenance of smooth rotation, thereby maintaining production facilities with Plummer block bearing The purpose is to improve productivity and productivity.

  In the plummer block bearing, the present inventors have provided a central filler port installed at a position within the range immediately above the radial bearing, an end filler port installed at a position outside the range directly above the space occupied by the radial bearing, By installing a plurality of oil filler openings on the upper surface of the bearing housing of the plummer block bearing, it has been found that the oil supply operation can be performed quickly according to the situation inside the bearing housing in operation, and the present invention has been completed. It came to do. More specifically, the present invention provides the following.

  (1) A plummer block bearing comprising a bearing box and a radial bearing that rotatably supports a rotating shaft, wherein a plurality of oil filler openings are installed on an upper surface of the bearing box, and the plurality of oil filler openings Is a central oiling port installed at a position within a range immediately above the space occupied by the radial bearing in the bearing box, and an end oil supply installed at a position outside the range immediately above the space occupied by the radial bearing. A plummer block bearing comprising a mouth.

  According to the invention of (1), in the bearing box of the plummer block bearing, the oil filler ports are separately provided in the range immediately above the radial bearing and the other ranges. Thereby, the lubricating oil can be efficiently filled during normal operation. When the abnormal temperature rises, new lubricating oil can be supplied avoiding the rolling surfaces and raceway grooves, which are heat sources, so that the refueling operation can be started quickly without waiting for the cooling of the part. Therefore, under any of the above operating conditions, additional lubrication can be efficiently and efficiently performed by properly using the plurality of oil filler ports provided at specific positions based on the original technical concept according to the operating conditions. It became possible to do.

  (2) The rolling elements fitted between the outer ring and the inner ring of the radial bearing have a two-row configuration, and an oil supply path that penetrates the outer ring is formed at the center of the outer ring, and the center oil supply port However, it is located immediately above the gap between the rows of the rolling elements in a two-row configuration, and is installed at a position where lubricant can be dropped into the gap via the oil supply path. Plummer block bearing.

  According to the invention of (2), it is possible to easily form a lubricating oil supply path in which a central oil supply port, an oil supply path, and a gap portion are communicated in a straight line with a radial bearing provided with a bearing in which the rolling elements have a two-row configuration. is there. As a result, the lubricating oil can be supplied very efficiently from one central oil supply port to the bearing having the two-row rolling elements.

  (3) A sealing ring having a widening end portion is installed along the inner edge of the insertion hole of the rotating shaft in the bearing box, and the end of the bearing box on the side where the end filler opening is installed The sealing ring is installed in such a manner that a widening end of the flange extends toward the outside of the bearing housing, and the sealing ring on the side where the end oil filler opening in the bearing housing is not installed is the flange The plummer block bearing according to any one of (1) and (2), wherein is installed in such a manner as to expand toward the inside of the bearing housing.

  According to the invention of (3), a very small amount of lubricating oil leaks from the gap portion by installing a sealing seal in a unique manner, particularly in the gap portion where higher hydraulic pressure from the inside of the bearing box is applied. Can be reduced. Thereby, it becomes easy to maintain a good operating state by injecting a smaller amount of lubricating oil. In addition, since an appropriate amount of lubricating oil can be stably maintained, the balance of heat balance is not lost, and the risk of abnormal heat generation is reduced.

  (4) A method of supplying oil to a plummer block bearing having a plurality of oil supply ports on the upper surface of the bearing box, wherein the plurality of oil supply ports are located within a range directly above the space occupied by the radial bearing in the bearing box. A central oil supply port installed and an end oil supply port installed at a position outside the range directly above the space occupied by the radial bearing, and the temperature of the radial bearing is equal to or higher than a predetermined lubricant deterioration start temperature. If this is the case, a method of supplying oil to the plummer block bearing that supplies lubricating oil from the end oil supply port.

  According to the invention of (4), in the case where the plummer block bearing in which the oil supply ports are separately provided in the range immediately above the radial bearing and in the other ranges, the above normal operation and abnormal temperature rise are used. It becomes possible to perform additional refueling efficiently under any operating conditions of the time.

  (5) The lubrication method for the plummer block bearing according to (4), wherein lubrication from the end portion lubrication port is performed with a grease gun.

  According to the invention of (5), it is possible to easily grasp the supply amount of the lubricating oil by supplying it with a grease gun that can supply the lubricating oil in a fixed quantity, and therefore, it is possible to grasp the oil supply state with high reliability. Therefore, if the supply frequency and the supply amount are recorded, it can be used as an index for the next maintenance.

As described above, according to the present invention, to shorten the time required for refueling operations to Plummer block bearing during operation of the production equipment with Plummer block bearing, thereby maintainability of production facilities using Plummer block bearing And productivity can be improved.

1 is an overall perspective view of a bearing structure using a plummer block bearing of the present invention. It is a partially broken perspective view which shows the outline of the internal structure of the plummer block bearing of this invention. It is a top view of the plummer block bearing of the present invention. It is a fracture side view showing the outline of the internal structure of the plummer block bearing of the present invention. It is a partially broken perspective view which shows the outline of the internal structure of other embodiment of the plummer block bearing of this invention.

  Hereinafter, a preferred embodiment of the plummer block bearing 10 of the present invention will be described with reference to FIGS. 1 to 5 as needed. However, the present invention is not limited to the following embodiments.

<Plummer block bearing>
As shown in FIGS. 1 and 2, the plummer block bearing 10 has an oil supply port 2 through which lubricating oil can be injected and an oil discharge port 3 through which deteriorated lubricating oil or the like can be discharged. The bearing device includes a bearing box 1 in which lubricating oil necessary for maintaining rotation can be retained, and a radial bearing 6 installed in the bearing box 1. The plummer block bearing 10 can rotatably support the cylindrical or columnar rotating shaft 20 by the action of the radial bearing 6. In the present specification, as shown in FIG. 1, a structure portion in which the rotating shaft 20 is rotatably supported by the plummer block bearing 10 is hereinafter referred to as a plummer block bearing structure 100. A bearing mechanism mainly composed of the bearing housing 1 and the radial bearing 6 except for the rotating shaft 20 is referred to as a plummer block bearing 10.

  The bearing box 1 is a hollow block made of metal, and as a material thereof, a material made of ordinary steel, various special steels, copper, or the like can be used as appropriate. Among these, ordinary steel that is excellent in heat conductivity and cost can be preferably used. The shape of the bearing housing 1 is as long as the radial bearing 6 can be installed inside and has a size, shape, and strength capable of rotatably supporting the rotary shaft 20 via the radial bearing. It is not limited to a specific shape. Further, the bearing box 1 may have a structure in which two hollow metal blocks that can be divided into upper and lower parts are integrated by a joining bolt 4. Since the bearing box 1 has a structure that can be vertically separated as necessary in this way, repair and replacement of members inside the bearing box 1 are facilitated. Further, when operating as the plummer block bearing structure 100 on which the rotary shaft 20 is mounted, the lower end portion of the bearing box is firmly fixed to a factory floor structure or the like with the fixing bolt 5 or the like.

  A plurality of oil supply ports 2 through which lubricating oil can be injected into the space inside the bearing housing 1 are formed on the upper surface portion of the bearing housing 1. The plurality of fuel filler ports 2 are configured to include a central fuel filler port 2A and an end portion fuel filler port 2B. As shown in FIGS. 2 and 3, the central oil filler port 2 </ b> A is formed in the upper surface portion of the bearing housing 1 at a position within a range immediately above the space occupied by the radial bearing 6 inside the bearing housing 1. Further, it is more preferable that the formation position of the central fuel filler port 2A is within the above range and at the central portion of the upper surface portion. On the other hand, the end oil filler 2 </ b> B is formed at a position outside the above range, that is, at a position other than the range directly above the space occupied by the radial bearing 6 inside the bearing housing 1. In addition, it is more preferable that the end oil filler 2B is formed in the vicinity of the side end portion of the upper surface portion.

  As described above, the central oil supply port 2A is installed at a position within the range directly above the space occupied by the radial bearing 6, so that the lubricating oil communicating with the space where the radial bearing 6 is installed in the bearing box 1 is provided. The supply path can be easily formed. Therefore, lubrication is efficiently and preferentially applied to the parts that most require the action of the lubricating oil, such as dripping the lubricating oil directly into the oil supply path formed in the outer ring of the radial bearing 6 by the oil supply from the central oil supply port 2A. Oil can be supplied. When an oil supply path such as a through hole or a through groove is formed in the central portion of the outer ring of the radial bearing 6, the central oil supply port 2A, the oil supply path, and the rolling elements inside the radial bearing 6 are communicated linearly. A supply path for the lubricating oil can be configured.

  As described above, the end oil supply port 2B is formed so as to avoid the area directly above the space occupied by the radial bearing 6, so that the bearing box 1 can be lubricated to communicate with the space where the radial bearing 6 is not installed. An oil supply path can be easily formed. Therefore, for example, even when the radial bearing 6 or its peripheral part has reached an abnormally high temperature exceeding the deterioration start temperature of the lubricating oil, it is not possible to perform additional oil supply from the central oil supply port 2A in a preferable state. Further, it is possible to quickly start additional refueling by refueling from the end refueling port 2B.

  It is preferable that the plurality of oil supply ports 2 including the central oil supply port 2A and the end oil supply port 2B are all plugged with grease nipples. In particular, in the plummer block bearing 10 of the present invention, it is particularly preferable to plug the end oil supply port 2B where a larger hydraulic pressure from the inside is easily applied with this grease nipple. Conventionally known grease nipples can be appropriately employed. The grease nipple is a member for supplying lubricating oil such as grease to a movable part of the machine, and has a check valve configured to press a ball with a spring from the inside. With this check valve, it is possible to prevent the lubricating oil from flowing backward even when a large oil pressure from the inside is applied to the oil supply port.

  In the vicinity of the lower end portion of the bearing housing 1, there is provided an oil discharge port 3 through which used lubricating oil that has become unnecessary, such as deteriorated lubricating oil, can be discharged. The oil discharge port 3 is preferably formed in such a manner that it opens to both side walls at the bottom of the bearing housing 1.

  In addition, the space inside the bearing housing 1 can have various volumes according to the shaft diameter of the rotating shaft 20 to be used. In general, the larger the diameter of the rotating shaft 20 is, the larger the volume is. In any case, the amount of retained lubricating oil is about 1/3 to 1/2 of the volume of the space inside the bearing housing 1. Is considered appropriate.

  The radial bearing 6 is a support member that can rotatably support a cylindrical or columnar metallic rotating shaft 20. More specifically, the radial bearing 6 is preferably a so-called bearing having a triple structure in which rolling elements are fitted between an inner ring and an outer ring. As such a bearing, a ball bearing using a spherical ball as a rolling element, a roller bearing using a cylindrical “roller” as a rolling element, and the like are known. As the radial bearing 6 of the present invention, these bearings can be appropriately selected depending on the purpose of use and the like. The surface of the rolling element is referred to as a rolling surface, and the raceway on which the rolling elements provided on the outer surface of the inner ring and the inner surface of the outer ring roll is referred to as a raceway groove.

  As the radial bearing of the plummer block bearing of the present invention, as shown in FIG. 5, a radial bearing 6 composed of a bearing having two rows of rolling elements can be preferably used. In a plummer block bearing 10A provided with a radial bearing 6 composed of a bearing having rolling elements of such a two-row configuration, a through groove or a through hole through which lubricating oil can be passed to the rolling element on the center surface of the outer ring of the bearing. It is preferable that the central oil supply port 2A is provided immediately above the gap 63 formed between the two rows of rolling elements 61 and 62 and the oil supply path. According to such an arrangement, it is possible to form a lubricating oil supply path in which the central oil supply port 2A, the oil supply path, and the gap 63 communicate with each other in a straight line. Lubricating oil can be supplied very efficiently to the bearing having the moving body.

  In the bearing box of the plummer block bearing, a sealing ring is usually installed along the inner edge of the insertion hole into which the rotary shaft is inserted in order to prevent water and dust from entering. As the ring for sealing, a conventionally known ring made of resin or the like can be appropriately used. However, in the plummer block bearing 10, the sealing ring is preferably a trumpet-shaped sealing ring 7A, 7B having a widening end as shown in FIG. The material of the sealing rings 7A and 7B is preferably a rubber material having moderate elasticity.

  In a general plummer block bearing, the sealing ring is a ring having a widening end in order to prevent foreign matters such as dust from entering the inside of the bearing box. It is common that the said collar part is installed in the aspect which spreads toward the inner side of a bearing box. As shown in FIG. 4, in the plummer block bearing 10 of the present invention, the above-described general sealing ring installation mode is used for the sealing ring 7 </ b> B on the side where the end filler opening 2 </ b> B is installed in the bearing housing 1. Unlike the above, it is preferable that the end-spreading flange portion is installed in such a manner that it extends toward the outside of the bearing housing. Thus, as will be described later, even when lubricating oil is injected by applying high pressure from the end oil filler 2B, leakage of lubricating oil from the periphery of the inner edge of the insertion hole of the rotary shaft 20 on the end oil filler 2B side is prevented. Can be prevented. On the other hand, the sealing ring 7A on the side where the end oil filler 2B in the bearing box 1 is not installed is in a mode in which the widening end of the ring expands toward the inside of the bearing box 1 as in the conventional general installation example. It is preferable that it is installed.

<Oil supply method to plummer block bearing>
The oil supply method to the plummer block bearing of the present invention is an oil supply method applicable to a plummer block bearing having a central oil supply port 2A and an end oil supply port 2B as in the plummer block bearing 10, for example. In this method, during normal operation of a production facility including the plummer block bearing structure 100, additional oil is supplied from the central oil supply port 2A out of the two oil supply ports, while the temperature of the radial bearing 6 is supplied. In the case where the temperature is higher than the temperature at which the deterioration of the lubricating oil starts, the lubricating oil is supplied from the end oil supply port 2B without supplying the oil from the central oil supply port 2A.

  In a production facility equipped with the plummer block bearing structure 100, during normal operation in which no abnormal temperature rise is observed, it is preferable to replenish the plummer block bearing 10 with lubricating oil from the central oil supply port 2A. During such normal operation, it is sufficient to replenish the lubricating oil that has been gradually reduced due to a small amount of leakage or volatilization from a slight gap in the sealing ring according to the amount of decrease, and an additional small amount of lubrication. Is performed from the central oil supply port 2A, the lubricating oil such as grease is made to reach the rolling surface and the raceway groove of the radial bearing 6 more quickly and efficiently, and the replenishment operation of the lubricating oil can be performed in a short time. Can be completed.

  On the other hand, in a production facility equipped with the plummer block bearing structure 100, when the lubricating oil staying in the bearing housing 1 of the plummer block bearing 10 is deteriorated due to an abnormal temperature rise exceeding an allowable range for some reason. It is necessary to replace the lubricating oil by discharging the deteriorated lubricating oil from the oil discharge port 3 and injecting new lubricating oil. In this case, the part that is the heat source for the abnormal temperature rise is often the rolling surface of the radial bearing 6 or the raceway groove. Therefore, the oil supply operation for injecting new lubricating oil cannot be started until these portions are sufficiently cooled.

  As in the plummer block bearing 10 of the present invention, if the end oil supply port 2B is separately provided in addition to the central oil supply port 2A, the oil supply from the end oil supply port 2B is performed when the abnormal temperature rises as described above. Supply of new lubricating oil while avoiding alteration due to contact with the high temperature part by avoiding direct contact of the lubricating oil with the above-mentioned rolling contact surface and raceway groove, which is a heat source of abnormal heat generation Can start.

  Further, in the method of supplying oil to the plummer block bearing of the present invention, it is preferable to inject the lubricating oil from the oil supply port with a grease gun capable of supplying a constant amount of lubricating oil. For example, if a grease gun capable of supplying 400 g of lubricating oil is used, it is possible to easily grasp the new supply amount of grease without using a new measuring instrument. In addition, since oil supply from the end oil supply port 2B can be performed at a high pressure by using a grease gun, the oil pressure is increased and the entire storage space inside the bearing housing 1 is increased from the end oil supply port 2B. Lubricating oil can be distributed quickly. In addition, the grease gun can accurately grasp the amount of lubricating oil that is newly injected into the radial bearing 6, so it can be used as an index for the next maintenance if the supply frequency and supply amount are recorded. Thus, maintenance work can be carried out systematically.

  As a synergistic effect, the plumber is effective in avoiding high temperature deterioration of the lubricating oil by using the end filler port 2B as the filler port, and accurately grasping the new amount of lubricating oil injected by injecting with the grease gun. The quality reliability of the state of the lubricating oil injected into the block can be further increased.

  As an example of the embodiment of the plummer block bearing 10 of the present invention, a trial operation was performed using the following apparatus.

<Example>
In the standard type plummer block bearing provided with a plummer block SD556G having a shaft diameter of φ260 mm, which is a bearing of a pinion gear for driving a rotary kiln, a self-aligning roller bearing 22256BK and an adapter H3156, each of the above-described inventions in the upper cover of the bearing box A fuel filler port A corresponding to the central fuel filler port 2A and a fuel filler port B corresponding to the end portion fuel filler port B were provided at positions within a specified range. The outer ring of the self-aligning roller bearing inside the bearing box incorporates an oil groove machined as an oil supply path. When the pinion gear bearing was installed, 6000 to 9000 g of grease was filled so that the capacity of the bearing box including the bearing rolling surface was about 1/3 to 1/2 of the internal space of the bearing box.

(During normal operation)
After that, the rotary kiln is operated, and during regular lubrication (1 month / time) during operation, it passes through the oil groove on the outer ring of the self-aligning roller bearing through the lubrication port A through the lubrication nipple, the roller part of the bearing, the rolling surface Directly filled with grease. The regular grease supply amount (200 g / month) is set to (200 g / month), and the grease and the rolling surface of the radial bearing are efficiently leaked outside the plummer block bearing. went.

(When abnormal temperature rises)
When the temperature of the plummer block bearing upper cover rose to 80 ° C., the grease deteriorated due to the high temperature was discharged from the oil discharge port, and immediately thereafter, the grease could be safely injected from the oil supply port B. In general, the deterioration start temperature, which is the temperature at which deterioration of grease, which is a lubricating oil used for plummer bearings, starts from about 80 ° C. to about 100 ° C. or more. In the above, when the cover temperature reaches 80 ° C., it is estimated that the temperature of the radial bearing portion serving as a high-temperature heat source is about 80 ° C. As for the deterioration start temperature, it is sufficient in practice to estimate it indirectly from the surface temperature of the bearing housing as described above. However, a temperature measuring device that measures the temperature of the radial bearing is installed to strictly control the temperature. It is more preferable to carry out.

  As described above, according to the present invention, it was confirmed that the lubricating oil can be exchanged efficiently both during normal operation and when the abnormal temperature rises.

DESCRIPTION OF SYMBOLS 1 Bearing box 2 Oil supply port 2A Center oil supply port 2B End part oil supply port 3 Oil discharge port 4 Joint bolt 5 Fixing bolt 6 Radial bearing 61, 62 Rolling body 63 Gap part 7A, 7B Sealing ring 10 Plummer block bearing 20 Rotating shaft 100 Plummer block bearing structure

Claims (4)

A plummer block bearing comprising a bearing box and a radial bearing that rotatably supports a rotating shaft,
A plurality of oil filler openings are installed on the upper surface of the bearing box,
The plurality of oil supply ports are installed at a position outside the range directly above the space occupied by the radial bearing, and a central oil supply port installed at a position within the range directly above the space occupied by the radial bearing inside the bearing housing. Ri Na includes a end filler opening to be a,
The sealing ring on the side where the end oil filler opening is installed in the bearing box, wherein a sealing ring having a widening end is installed along the inner edge of the insertion hole of the rotating shaft in the bearing box Is installed in such a manner that the widening collar extends toward the outside of the bearing box,
A plummer block bearing in which the sealing ring on the side of the bearing box where the end oil filler is not installed is installed in such a manner that the flange extends toward the inside of the bearing box .   The rolling elements fitted between the outer ring and the inner ring of the radial bearing have a two-row configuration, and an oil supply path that penetrates the outer ring is formed at the center of the outer ring. 2. The plummer block bearing according to claim 1, wherein the plummer block bearing is disposed immediately above a gap portion between rows of the rolling elements in a row configuration and is capable of dripping lubricating oil into the gap portion via the oil supply path. . A lubrication method for a plummer block bearing having a plurality of lubrication ports on an upper surface of a bearing box,
The plurality of oil supply ports are installed at a position outside the range directly above the space occupied by the radial bearing, and a central oil supply port installed at a position within the range directly above the space occupied by the radial bearing inside the bearing box. An end refueling port, and
A lubrication method to a plummer block bearing that feeds lubricating oil from the end oiling port when the temperature of the radial bearing is equal to or higher than a predetermined lubricating oil deterioration start temperature. The lubrication method to the plummer block bearing according to claim 3 , wherein lubrication from the end portion lubrication port is performed by a grease gun.

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