JPH072637U - Bearing box - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a bearing box capable of preventing leakage of lubricant from a shaft sealing device when replenishing the bearing with lubricant from the outside. [Structure] A bearing that allows a shaft of a rotating object to rotate, a sealing device that seals the bearing in a sealed state, a greasing pipe that supplies a lubricant to the bearing, and a shaft provided on the opposite side of the bearing. A bearing box comprising a grease discharge pipe, wherein another grease discharge pipe having a different inner diameter is provided between the bearing and the seal of the sealing device.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bearing box that stores and holds a bearing that replenishes a lubricant from the outside and holds a rotating object such as a roll shaft.

[0002]

[Prior art]

 Generally, as shown in FIG. 5, a bearing 1 that holds a rotating object such as a shaft of a roll 7 is housed in a bearing box 2, and a lubricant necessary for lubricating the bearing 1 is provided on the top or other side. From the direction of the above, the oil is supplied to the bearing 1 in the sealing device 3 inside the bearing housing 2 or the vicinity of other bearings through the greasing pipe (or supply pipe) 4.

In order to prevent the lubricant supplied to the bearing box 2 from flowing out and scattering from the end face on the shaft side, the seal 3a of the sealing device 3 for the shaft of the roll 7 separates the outside from the inside of the bearing. The lubricated lubricant contributes to the lubrication of the bearing, and then is discharged to the outside of the bearing box 2 through a grease discharge pipe (or discharge pipe) 5 and is collected in a recovery tray 6. Further, as shown in FIG. 6, the bearing box 2 may be assembled to a partition wall 8 for distinguishing the environment between the main body such as the roll 7 and the outside where the bearing 1 is present, but the basic configuration is As described above.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned bearing box, when the lubricant is externally supplied to the sealing device 3 filled with the lubricant inside the bearing box 2 through the supply pipe 4, the inside of the sealing device 3 immediately after that is supplied. The pressure distribution has irregular peaks as shown in Fig. 2. If the resistance of the drainage pipe 5 is too high, the pressure distribution changes as shown by the dotted line, and the seal 3a of the sealing device 3 is not the drainage pipe 5. The lubricant may flow out to one side.

Further, when the shaft starts to operate after the lubricant is supplied, the bearing 1 tries to push the lubricant away, so that the flow of the lubricant is not limited to the grease discharge pipe 5 side but the sealing device 3 The seal 3a side exerts a force to push it away, but since the lubricant is sealed by the sealing device 3, a larger pressure is generated on the seal 3a side than on the greasing pipe 5 side. When exceeds the sealing limit of the sealing device 3, there is a problem that the lubricant flows out and leaks out of the system.

Similarly, when the shaft starts operating, heat is generated. Therefore, the thermal expansion of the lubricant due to the heat causes a pressure increase in the sealing device 3, but the sealing device 3 seals the pressure. As a result, there is a problem that a high pressure is generated on the seal 3a side from the drainage pipe 5 side and flows out and leaks to the seal 3a side. An object of the present invention is to provide a bearing box that solves the above problems.

[0007]

[Means for Solving the Problems]

 The present invention relates to a bearing that rotatably holds a shaft of a rotating object, a sealing device that seals the bearing in a sealed state, a greasing pipe that supplies a lubricant to the bearing, and an abaxial side of the bearing. In the bearing box including the oil discharge pipe provided in the above, another oil discharge pipe having a different inner diameter is provided between the bearing and the seal of the sealing device.

[0008]

[Work]

 According to the present invention, a bearing that rotatably holds a shaft of a rotating object, a sealing device that seals the bearing in a hermetically sealed state, a greasing pipe that supplies a lubricant to the bearing, and an opposite shaft of the bearing. In a bearing box consisting of a drain pipe provided on the side of the bearing, another drain pipe is provided between the bearing and the seal of the sealing device, and the cross-sectional area of the drain pipe is provided on the opposite shaft side of the bearing. Since it is made larger than the fat pipe, the lubricant discharged from the drain pipe can be discharged at the same pressure through each drain pipe, so that the pressure of the lubricant in the sealing device is balanced and the lubricant leaks. Disappears.

That is, although grease is generally used as the lubricant of the bearing, when the flow resistance is experimentally determined, the length of the pipe through which the grease flows becomes longer as shown in FIG. The grease discharge pressure increases almost linearly, and if the type and viscosity of the grease used differ, the grease discharge pressure also changes. In addition, Fig. 4 shows the relationship between the same grease and the inner diameter and length of the pipe used. Even with the same grease, the thinner the inner diameter of the pipe, the higher the drainage pressure, and the larger the inner diameter of the pipe, the grease drainage. The result is that the pressure becomes smaller.

[0010]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of a bearing box 2 according to the present invention, in which 5a is a shaft side greasing pipe and 5b is an opposite shaft side greasing pipe. The lubricant is supplied from the upper part of the bearing box 2 to the bearing 1 in the sealing device 3 through the greasing pipe 4, and the lubricant used for lubricating the shaft of the roll 7 is discharged through the greasing pipes 5a and 5b. It is discharged to the recovery tray 6 outside the bearing box 2.

For example, in order to set the sealing limit of the sealing device 3 to a pressure of 0.2 kgf / cm ² and keep the anti-greasing pipe 5b below the sealing limit pressure, the anti-greasing pipe 5b should have an inner diameter of 4 mm and a long length. Assuming that a pipe with a length of 100 mm is selected, in this case, the grease discharge on the shaft side of the bearing 1 must also be set to the sealing limit pressure of the sealing device 3 or less, but the length of the grease discharge pipe 5a on the equipment is limited. Therefore, in the greasing pipe having the same inner diameter as the greasing pipe 5b on the non-shaft side, the resistance of the lubricant increases and the pressure rises. Therefore, the cross-sectional area of the greasing pipe 5a on the shaft side is increased. It must be done. In the embodiment, a pipe having an inner diameter of 6 mm and a length of 170 mm was used as the drainage pipe 5a.

The difference 70 mm in length between the greasing pipes 5a and 5b is comparable to the width of the bearing 1, and the lubricant discharged from the greasing pipes 5a and 5b can be collected at the same position. . In the present embodiment, the shape cross section of the grease discharge pipe 5a and the grease discharge pipe 5b is circular, but it may have a square cross section, and the same effect can be obtained by using a plurality of grease discharge pipes 5 having the same cross section.

Further, when the distance to the recovery tray 6 is longer in the drainage pipe 5b than in the drainage pipe 5a due to the arrangement of the equipment, conversely, the inner diameter of the drainage pipe 5b is smaller than that of the drainage pipe 5a. It is necessary to make it larger than the inner diameter.

[0014]

[Effect of device]

 As described above, according to the bearing box of the present invention, the lubricant does not leak or flow out from the shaft sealing device portion such as the roll when the lubricant is supplied from the outside, and the bearing heat generation or the bearing The lubricant leakage and outflow from the shaft sealing device part caused by the pressure imbalance between the bearing side and the bearing side due to the lubricant repelling action is eliminated, and the labor cost for dealing with the lubricant leakage and outflow accident is saved. In addition, the operating rate of the bearing device is improved, and its reliability can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of the present invention.

FIG. 2 is a relationship diagram showing a pressure distribution of a lubricant in a conventional bearing box.

FIG. 3 is a characteristic diagram showing the relationship between the length of a grease discharge pipe having a constant inner diameter and the grease discharge pressure for each grease type.

FIG. 4 is a characteristic diagram showing the relationship between the length of three types of drainage pipes having different inner diameters and the drainage pressure.

FIG. 5 is an explanatory view showing an example of a conventional bearing box.

FIG. 6 is an explanatory view showing another example of a conventional bearing box.

[Explanation of symbols]

 1 Bearing 2 Bearing box 3 Sealing device 3a Sealing device seal 4 Greasing pipe 5 Greasing pipe 5a Greasing pipe 5b Greasing pipe 6 Collection tray 7 Roll 8 Partition

Claims (1)

[Scope of utility model registration request] 1. A bearing that rotatably holds a shaft of a rotating object, a sealing device that seals the bearing in a sealed state, a greasing pipe that supplies a lubricant to the bearing, and a shaft opposite to the bearing. A bearing box comprising a provided drainage pipe, wherein another drainage pipe having a different inner diameter is provided between the bearing and the seal of the sealing device.