JP2009041656A - Rolling bearing device and method of filling grease to rolling bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device and a method of filling grease to the rolling bearing device capable of preventing lubrication defect at start-up by increasing a filling rate of the grease to a bearing part. <P>SOLUTION: A greasing passage 16 for supplying the grease to the bearing part B consisting of an inner raceway 11, an outer raceway 12 and a plurality of rolling elements 5 arranged between the inner and outer raceways 11, 12 and a communication hole 19 for communicating the bearing part B and an external part O of an axle box 2 are formed in the axle box 2. The communication hole 19 is formed in the axle box 2 above a horizontal surface L including an axis Q of the bearing part B. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rolling bearing device and a method of filling grease in the rolling bearing device.

  Conventionally, in a continuous casting machine, for example, a two-part bearing device as shown in FIG. 5 is used in order to support an intermediate portion of a roll having a reduced diameter (see Patent Document 1). This two-part bearing device 101 includes a bearing portion B inside the axle box 102, and below this bearing portion B, a grease supply passage 116 for introducing grease to the bearing portion B and a grease outlet from the bearing portion B. A drainage path 117 is provided for discharging grease to 117a. The two-part bearing device 101 is usually temporarily placed in a state where the bearing B is filled with grease and then used. In the conventional grease filling method, the grease is supplied to the greasing passage 116 after opening the greasing port 117a, and it is considered that the filling is completed when the grease leaks from the greasing port 117a.

JP 58-32558 A

  However, in the two-split bearing device 101 of Patent Document 1, the grease supply passage 116 and the drainage passage 117 are formed below the bearing portion B. Therefore, even if grease is charged by the above method, the lower portion of the bearing portion B Only grease was collected and the filling rate was low. As a result, there is a problem in that water enters the bearing portion B and rust is generated, resulting in poor lubrication when the two-part bearing device 101 is started.

  The present invention has been made in view of such circumstances, and to a rolling bearing device and a rolling bearing device capable of preventing occurrence of poor lubrication at the time of starting by increasing the filling ratio of grease into the bearing portion. The purpose is to provide a method of filling grease.

  A rolling bearing device according to the present invention includes an inner ring raceway, an outer ring raceway, and a plurality of rolling elements arranged between the inner and outer ring raceways, and a bearing portion formed inside the axle box. A rolling bearing device including a sealing member that seals against an outside of the axle box, wherein the grease supply passage for supplying grease to the bearing portion to the axle box, the bearing portion, and the shaft A communication hole communicating with the outside of the box is formed, and the communication hole is formed above the horizontal plane including the shaft center of the bearing portion in the shaft box.

  According to this rolling bearing device, since the communication hole is provided above the horizontal plane including the shaft center of the bearing portion in the axle box, the grease is supplied through the greasing passage until the grease leaks from the communication hole. For example, the area below the horizontal plane including the shaft center of the bearing portion is filled with grease. Thereby, the filling rate of the grease to the bearing portion can be increased as compared with the conventional method in which the grease is filled through the greasing passage until the grease leaks from the grease outlet formed below the bearing portion. In addition, in this rolling bearing device, rolling elements located under a horizontal plane including the shaft center of the bearing portion, which are loaded during operation, can be lubricated with grease, so seizure, wear, etc. due to poor lubrication at the start-up Can be prevented.

  The method of filling grease in the rolling bearing device according to the present invention includes a bearing portion including an inner ring raceway, an outer ring raceway, and a plurality of rolling elements arranged between the inner and outer ring raceways. And a sealing member that seals the bearing portion with respect to the outside of the axle box. The rolling bearing device is filled with grease, and includes a horizontal plane including the axis of the bearing portion of the axle box. The communication hole provided above is opened, grease is supplied to the bearing portion through a grease supply path provided in the axle box, and the communication hole is closed after the grease leaks from the communication hole. It is said.

  According to this grease filling method for the rolling bearing device, the grease can be filled up to the position of the communication hole provided above the horizontal plane including the shaft center of the bearing portion in the axle box. Thereby, grease is filled through the greasing passage until the grease leaks from the grease outlet formed below the bearing portion, and compared with the conventional method in which only the lower portion of the bearing portion can be filled with grease, It is possible to reliably increase the grease filling rate in the bearing portion.

  According to the rolling bearing device and the method of filling grease in the rolling bearing device of the present invention, it is possible to prevent the occurrence of poor lubrication at the start-up by increasing the filling rate of grease into the bearing portion.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a partially cutaway front view showing a rolling bearing device according to a first embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II of the rolling bearing device of FIG. As shown in FIGS. 1 and 2, the rolling bearing device 1 includes a shaft box 2, an inner ring 3, an outer ring 4, and a cylindrical roller 5 as a rolling element.

The axle box 2 is composed of an upper axle box 6 and a lower axle box 7 that are divided into two by a horizontal plane L including an axis Q so as to face the shaft body S to be supported. Both axle boxes 6 and 7 are made of cast steel and are fastened together by bolts 8.
The upper shaft box 6 is provided with a semicircular raceway groove 6a on the inner periphery thereof. The upper shaft box 6 is provided with a cooling water chamber 6c sealed with a jacket plate 6b. The cooling water chamber 6c has both ends in the circumferential direction communicating with the water supply channel 9 and the drainage channel 10. By supplying cooling water from the water supply channel 9 into the cooling water chamber 6c, the upper portion of the upper shaft box 6 is provided. Can be cooled.
On the other hand, a concave spherical arc groove 7a that matches an outer peripheral surface 4a of the outer ring 4 described later is provided on the side of the lower axle box 7 that faces the upper axle box 6. A groove 7b having a V-shaped cross section perpendicular to the circumferential direction is formed in the entire region in the circumferential direction centering on the axial center of the concave spherical arc groove 7a and the axis Q of the arc groove 7a. In addition, a concave portion having an axial length longer than the circumferential length is formed at the axial center of the concave spherical arc groove 7a and at the circumferential center centered on the axis Q.

  As shown in FIG. 2, the inner ring 3 is composed of one annular body in which two semicircular members are fastened, and a fastening bolt (not shown) is screwed into a bolt hole 3 a formed in each semicircular member. The shaft body S is clamped by the inner periphery. And the axial center part of the outer peripheral surface 3b of the inner ring | wheel 3 comprises the inner ring | wheel track 11 which rolls each cylindrical roller 5. As shown in FIG.

  The outer ring 4 is a semicircular outer ring having a convex spherical outer peripheral surface 4 a, and the outer peripheral surface 4 a is in surface contact with the circular arc groove 7 a of the lower axle box 7. On the other hand, the inner peripheral surface 4b of the outer ring 4 is formed in an arc shape continuous with the raceway groove 6a of the upper axle box 6, and constitutes an outer ring raceway 12 for rolling the cylindrical roller 5 together with the raceway groove 6a. . Further, as shown in FIG. 1, a through hole 4c penetrating the inner peripheral surface 4b is formed at the center in the axial direction of the outer peripheral surface 4a. A recess is formed in the outer peripheral surface 4a at the center in the axial direction of the outer ring 4 and at the center in the circumferential direction centered on the axis Q, and a knock pin 21 is fitted. The knock pin 21 has a circular cross section perpendicular to the radial direction of the portion protruding from the outer peripheral surface 4a. Then, by loosely fitting with the recess of the lower axle box 7, the inclination (alignment) of the outer ring 4 with respect to the axis Q is allowed and the movement of the outer ring 4 in the circumferential direction is restricted.

The inner ring raceway 11, the outer ring raceway 12, and the plurality of cylindrical rollers 5 disposed between the inner and outer ring raceways 11, 12 constitute a bearing portion B.
The rolling bearing device 1 includes a sealing member M that seals the bearing portion B against the outside O of the axle box 2. As the sealing member M, as shown in FIG. 2, a labyrinth ring 13, a packing 14, and a seal member 15 are provided at an axial end of the rolling bearing device 1. The labyrinth ring 13 is fixed to the axial ends of the upper axle box 6 and the lower axle box 7, and a gap is formed in the circumferential groove S1 provided on the side end surface between the large diameter portion and the small diameter portion of the shaft body S. Thus, a labyrinth-type seal structure is formed. Further, the packing 14 and the seal member 15 are respectively fitted in grooves 3 c and 3 d provided on the outer peripheral surface 3 b of the inner ring 3, and the outer peripheral portion of the packing 14 and the lip 15 a of the seal member 15 are on the inner peripheral surface 13 a of the labyrinth ring 13. A contact-type seal structure is formed by sliding contact.

  Further, the lower axle box 7 is provided with a grease supply passage 16 for supplying grease to the bearing portion B. The greasing path 16 has a greasing port 16a opened at both axial end surfaces of the lower axle box 7 and the axial center of the concave spherical arc groove 7a and the center Q of the arc groove 7a. The groove 7b formed over the entire circumferential direction is communicated. The grease supplied from the greasing port 16 a is led to the greasing passage 16, led to the through hole 4 c along the groove 7 b on the inner peripheral surface of the lower axle box 7, and filled in the bearing portion B.

Further, the lower axle box 7 is provided with a fat drainage passage 17 for discharging grease to the outside O of the axle box 2. As shown in FIG. 2, the fat drainage path 17 includes a gap between the end face of the outer ring 4 and the labyrinth ring 13 and a fat drain opening (not shown) opened in the axial end face of the lower axle box 7. Communicate.
The greasing port 16a and the drainage port are provided with a sinking plug 18 that is a closing means that can be opened and closed, but are usually closed by the sinking plug 18.
As shown in FIG. 1, the shaft box 2 is above the horizontal plane L including the shaft center Q of the bearing portion B, that is, the upper shaft box 6 communicates with the bearing portion B and the outside O of the shaft box 2. A hole 19 is provided. Although the opening 19a on the outside of the communication hole 19 is also provided with a sinking plug 20 that is a closing means that can be opened and closed, the opening 19a is normally closed by the sinking plug 20.

Here, a method of filling the rolling bearing device 1 with grease will be described.
First, the sinking plug 20 in the opening 19 a of the communication hole 19 is removed to open the communication hole 19. Next, the sinking plug 18 of one greasing port 16a is pulled out, and grease is supplied therefrom. The grease is guided along the groove 7b on the inner peripheral surface of the lower axle box 7 through the greasing passage 16 in the lower axle box 6 and enters the gap between the cylindrical rollers 5 from the through hole 4c, and the bearing portion. It is filled from the lower part of B. When the grease is filled up to the height of the communication hole 19, the grease leaks from the opening 19 a, and therefore, the supply of grease is stopped after confirming that the grease has leaked from the opening 19 a, and the opening of the communication hole 19 19 a and the greasing port 16 a are sunk and closed with plugs 20 and 18.

According to this filling method, the grease can be filled up to the height of the communication hole 19, that is, above the horizontal plane L including the axis Q of the bearing portion B. As a result, the grease is filled through the greasing passage until the grease leaks from the grease outlet formed below the bearing portion B, and compared with the conventional method in which the grease can be filled only in the lower portion of the bearing portion B. Thus, the filling rate of the grease into the bearing portion B can be reliably increased.
In addition, by operating in a state where the fat removal opening is opened, the old grease is discharged from the fat removal passage 17 to the outside O of the axle box 2.

  FIG. 3 is a partially cutaway front view showing a rolling bearing device according to a second embodiment of the present invention. In the rolling bearing device 1 shown in FIG. 3, the lower shaft box 7 is not provided with the oil removal path 17, and grease is pushed out from between the lip 15 a of the seal member 15 and the inner peripheral surface 13 a of the labyrinth ring 13 to the outside O. It is of the type that discharges (see FIG. 2). Other than that, the second embodiment is the same as the first embodiment, and the description thereof is omitted by giving the same reference numerals.

  Also in the rolling bearing device 1 according to the second embodiment, the sinking plug 20 in the opening 19a of the communication hole 19 is pulled out to open the communication hole 19, and the sinking plug 18 in one of the greasing ports 16a is pulled out. And grease is filled from the lower part of the bearing part B by supplying grease from the greasing port 16a. When the grease is filled up to the height of the communication hole 19, the grease leaks from the opening 19 a on the outer side. Therefore, it is confirmed that the grease has leaked from the opening 19 a of the communication hole 19 and the supply of grease is stopped. The opening 19 a of the hole 19 and the greasing port 16 a are sunk and closed with plugs 20 and 18.

  Even with this filling method, the grease can be filled up to the height of the communication hole 19, that is, above the horizontal plane L including the shaft center Q of the bearing portion B. It is possible to raise it reliably.

  As described above, according to the rolling bearing device 1 and the method of filling the rolling bearing device 1 with grease according to the present invention, the grease filling rate can be increased as compared with the prior art, so that a load is applied during operation (bearing portion B). The cylindrical roller 5 (located below the horizontal plane L including the axis Q) can be lubricated with grease. For this reason, it is possible to prevent seizure, wear, and the like due to poor lubrication during startup.

The present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope of the present invention. In the said 1st and 2nd embodiment, although the communicating hole 19 is provided in the side part of the upper side axle box 6, when not providing the cooling water chamber 6c in the upper side axle box 6, it shows in FIG. Thus, it is also possible to provide at the top of the upper axle box 6. In this case, the filling rate of grease can be further increased.
Moreover, in the said 1st and 2nd embodiment, although the two-divided type axle box 2 is used, it is also possible to use an integral type axle box.

1 is a partially cutaway front view showing a rolling bearing device according to a first embodiment of the present invention. It is the II-II sectional view taken on the line of the rolling bearing apparatus of FIG. It is a partial notch front view which shows the rolling bearing apparatus which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the rolling bearing apparatus which concerns on other embodiment of this invention. It is sectional drawing which shows the conventional rolling bearing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rolling bearing apparatus 2 Shaft box 3 Inner ring 4 Outer ring 5 Cylindrical roller (rolling element)
6 Upper axle box 7 Lower axle box 11 Inner ring raceway 12 Outer ring raceway 13 Labyrinth ring 14 Packing 15 Sealing member 16 Greasing path 18 Sink plug (closure means that can be opened and closed)
19 Communication hole 20 Sink plug (closure means that can be opened and closed)
B Bearing part M Sealing member L Horizontal plane including shaft center of bearing part

Claims (2)

Inside the axle box,
A bearing portion composed of an inner ring raceway, an outer ring raceway, and a plurality of rolling elements disposed between the inner and outer ring raceways,
A rolling bearing device provided with a sealing member that seals the bearing portion with respect to the outside of the axle box,
A grease supply passage for supplying grease to the bearing portion and a communication hole that communicates the bearing portion and the outside of the shaft box are formed in the shaft box, and the communication hole is formed in the shaft box. A rolling bearing device, wherein the rolling bearing device is formed above a horizontal plane including an axis of the bearing portion. Inside the axle box,
A bearing portion composed of an inner ring raceway, an outer ring raceway, and a plurality of rolling elements disposed between the inner and outer ring raceways,
A sealing member that seals the bearing portion with respect to the outside of the axle box, and a method of filling the rolling bearing device with grease,
A communication hole provided above a horizontal plane including the shaft center of the bearing portion of the shaft box is opened, grease is supplied to the bearing portion through a greasing passage provided in the shaft box, and the grease is supplied to the communication hole. A method of filling grease in a rolling bearing device, wherein the communication hole is closed after leakage from the bearing.

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