JP3794014B2 - Bearing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bearing device with a cooling jacket used for, for example, a driving roll for continuous casting.
[0002]
[Prior art]
In a bearing device used for a continuous casting drive roll, generally, a cooling water jacket for cooling the bearing and a cooling water jacket for supplying and discharging the cooling water to and from the bearing housing that houses the bearing. A cooling water inflow hole and a cooling water outflow hole are formed. The cooling water jacket is formed on the surface facing the slab side of the bearing box, and the cooling water supplied from the cooling water inflow hole flows through the cooling water jacket and is discharged from the cooling water outflow hole. It is comprised so that may be transmitted to a bearing.
[0003]
In such a bearing device with a cooling jacket, if bubbles remain in the cooling water jacket, the cooling water jacket may be damaged due to expansion of the bubbles due to heat. Therefore, it is necessary to increase the flow rate (flow rate) of the cooling water so that the bubbles do not stagnate in the cooling water jacket, or to make the shape of the cooling water jacket difficult for the bubbles to stagnate.
[0004]
The present applicant has already proposed a cooling water jacket having a shape in which bubbles are not easily stagnated without increasing the flow rate of cooling water (Japanese Patent Laid-Open No. 1-30925). In this proposed technique, both ends in the circumferential direction of the cooling water jacket 42 of the bearing box 41 are illustrated in FIG. 4 as a partial axial cross-sectional view and as shown in FIG. 5 as a plan view with the jacket lid 45 removed. The axial width W of the central portion 42c between the cooling water inlet 42a and the cooling water outlet 42b formed in the portion is made substantially constant, and the axial width w of the cooling water inlet 42a and the outlet 42b is made narrower than that. Thus, a bearing device having a boat-shaped cooling water jacket 42 in plan view as a whole, which is gradually widened and connected to the central portion 42c is proposed.
[0005]
According to this proposed technique, there is no sudden change in the cross-sectional area in the cooling water flow path in the cooling water jacket 42 from the cooling water inlet 42a through the central portion 42b to the cooling water outlet 42c, and the cooling water inlet 43a to the cooling water inlet 42a. The cooling water that has flowed into the cooling water jacket 42 after passing through the cooling water jacket 42 smoothly flows into the cooling water outlet 42b, is discharged to the outside through the cooling water outlet hole 44, and the cooling water flow rate is reduced. It is possible to prevent bubbles from staying in the cooling water jacket 42 without increasing the size.
[0006]
By the way, in the above proposed technology, since the shape of the cooling water jacket 4 is a boat shape in which the widths of both ends thereof are narrowed, the cooling water inlet and the cooling water outlet are limited to one each. In recent years, continuous casting roll bearing devices tend to increase the outer diameter of the bearing in order to increase the rated load of the bearing. However, if the outer diameter of the bearing device is increased without changing the size of the entire bearing device, 4, the area of the dividing surface P that divides the upper half member 41a and the lower half member 41b of the bearing box 41 shown in FIG. 5 is reduced, and the cross-sectional areas of the cooling water inflow hole and the cooling water outflow hole cannot be increased. .
[0007]
Therefore, conventionally, in order to ensure the necessary cooling water flow rate, the bearing box 61 is formed as shown in FIG. 6 as a partial axis orthogonal sectional view and as shown in FIG. 7 as a plan view with the jacket lid 65 removed. The cooling water inflow hole 63 and the cooling water outflow hole 64 to be formed are each two, and the shape of the cooling water jacket 62 is made substantially uniform in its axial width W, and two cooling waters are provided at both ends thereof. A structure in which two cooling water inlets 62 a and cooling water outlets 62 b communicating with the water inflow hole 63 are formed is employed.
[0008]
[Problems to be solved by the invention]
However, in the conventional bearing device shown in FIGS. 6 and 7, in which two cooling water inflow holes and two cooling water outflow holes are provided in order to ensure the cooling water flow rate even when the area of the dividing surface P is reduced, The cooling water that has flowed into the cooling water jacket 62 from the two cooling water inflow holes 63 through the two cooling water inlets 62a undergoes a sudden cross-sectional increase of the cooling water jacket 62 that is the flow path, and then suddenly increases. Since the cooling water outlet 62b is passed through the cross-sectional reduction and reaches the cooling water outflow hole 64, bubbles are likely to stay in the cooling water jacket 62, and in order to prevent bubbles from staying in the cooling water jacket 62, the cooling water flow rate is set to be low. There is a problem that it must be considerably increased.
[0009]
The present invention has been made in view of such circumstances, and even if the cooling water inflow hole and the cooling water outflow hole are each two and the cooling water inlet and outlet of the cooling water jacket are each two, the cooling water flow rate is increased. Therefore, an object of the present invention is to provide a bearing device in which bubbles are not easily trapped in the cooling water jacket.
[Means for Solving the Problems]
[0010]
In order to achieve the above object, a bearing device according to the present invention is a bearing device in which a cooling water inflow hole and a cooling water outflow hole are formed in a bearing box that houses a rolling bearing, and a cooling water jacket is formed therebetween. The cooling water jacket has a substantially uniform dimension in the axial direction of the bearing housing, and two cooling water inlets communicating with the cooling water inflow holes at one end of both circumferential ends. Two cooling water outlets communicating with the cooling water outflow holes are formed at the other end, respectively, and the bearing box or the lid of the cooling water jacket projects toward the cooling water jacket. The rib is characterized in that the width dimension of the rib in the axial direction of the bearing housing gradually decreases from both ends of the cooling water jacket toward the center.
[0011]
The present invention seeks to achieve the intended purpose by adopting a shape that can eliminate a sudden change in the cross-sectional area even if the cooling water jacket has two cooling water inlets and two outlets. Is.
[0012]
That is, when there are two cooling water inlets and two outlets, the shape of the cooling water jacket cannot be a boat shape, and the axial dimension W as shown in FIG. If this is the case, it should be rectangular in plan view as described above, but with respect to the cooling water jacket having such a shape, the rib protrudes from the bearing box body side or the lid side, and the axial dimension of the rib If the (width) is wider toward both ends of the jacket and gradually narrows toward the center, the cross-sectional area of the cooling water jacket is not limited to boat-shaped cooling water, although two cooling water inlets and two outlets are provided. Similar to the jacket, there is no sudden change in the cross-sectional area from the cooling water inlet to the cooling water outlet. As a result, the flow of cooling water in the cooling water jacket is smooth, and it is possible to prevent air bubbles from staying without increasing the cooling water flow rate. The cooling water flow rate is almost the same as that of a conventional boat-shaped cooling water jacket. This makes it possible to prevent the bubbles from staying.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a partial axis orthogonal cross-sectional view of an embodiment of the present invention, and FIG. 2 is a plan view showing a state in which the jacket lid 5 is removed. FIG. 3 is a perspective view of the main part in the vicinity of the cooling water jacket 2 shown with the jacket lid 5 removed.
[0014]
The bearing box 1 that houses the bearing 10 is composed of an upper half 1a and a lower half 1b, which are fastened and integrated with each other by bolts B in a state where they are abutted on the dividing surface P. A cooling water jacket 2 is formed in the upper half 1 a of the bearing box 1. The cooling water jacket 2 is formed by covering the surface of the recess D provided in the upper half 1a of the bearing box 1 with a jacket lid 5 made of a flat plate member and sealing it to the outside.
[0015]
The cooling water jacket 2 has a substantially uniform width dimension W, that is, a dimension W in the axial direction of the bearing housing 1 and has a rectangular shape in plan view. The cooling water inlet 2a is formed on the other side, and two cooling water outlets 2b are formed on the other side. Each cooling water inlet 2a communicates with two cooling water inflow holes 3 formed through the upper half 1a and the lower half 1b of the bearing box 1, and the cooling water outlet 2b is similarly connected to the bearing box. 1 communicates with two cooling water outflow holes 4 formed through the upper half 1a and the lower half 1b.
[0016]
A pair of left and right ribs projecting into the cooling water jacket 2 on the surface of the recess D provided in the upper half 1a of the bearing box 1 to form the cooling water jacket 2, that is, the bottom surface of the cooling water jacket 2 L is formed. Each rib L has a width (dimension in the axial direction of the bearing housing 1) that is wider toward the end of the water-cooled water jacket 2 and narrower toward the center, and has a V shape in plan view. The two cooling water inlets 2a and the cooling water outlet 2b are opened on both sides in the axial direction with a V-shaped rib L interposed therebetween.
[0017]
According to the above embodiment of the present invention, due to the presence of the V-shaped rib L, there is no sudden change in the cross-sectional area of the cooling water jacket 2 from the cooling water inlet 2a to the cooling water outlet 2b. Therefore, the cooling water that has flowed into the cooling water jacket 2 from the cooling water inflow hole 3 via the two cooling water inlets 2a flows smoothly toward the two cooling water outlets 2b. Thereby, according to this embodiment, it is possible to prevent air bubbles generated in the cooling water jacket 2 from staying without increasing the cooling water flow rate.
[0018]
In the embodiment described above, the pair of ribs L having a V shape in plan view are provided on the main body side of the bearing box 1, but a similar pair of ribs L is provided on the jacket lid 5 side to provide a cooling water jacket. Even if it protrudes toward 2, it is possible to achieve the same effect as described above, and the present invention includes such a configuration.
[0019]
【The invention's effect】
As described above, according to the present invention, two cooling water inlets and two outlets are provided, and the bearing box has an axial dimension in the circumferential direction toward the inside of the cooling water jacket that is substantially rectangular in plan view. Since the ribs that are wider at both ends are projected, there is no sudden change in the cross-sectional shape of the cooling water jacket between each of the two cooling water inlets and the cooling water outlet. Thus, the cooling water smoothly flows in the cooling water jacket and flows out from each cooling water outlet, and bubbles can be prevented from staying in the cooling water jacket without increasing the cooling water flow rate.
[0020]
As a result, the diameter of the cooling water inflow hole and the outflow hole formed in the bearing box is reduced by increasing the outer diameter of the bearing so as to increase the rated load of the bearing without changing the dimensions of the bearing box. Even when there is no choice but to use two each, it is possible to prevent explosions due to heating by suppressing the retention of bubbles under the same cooling water flow rate as when using a conventional boat-shaped cooling water jacket. It has become possible to save energy by saving the cooling water flow rate.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional front view of an embodiment of the present invention.
2 is a plan view showing a state in which a jacket lid 5 in FIG. 1 is removed. FIG.
FIG. 3 is a perspective view of a main part in the vicinity of the cooling water jacket 2 with the jacket lid 5 of the embodiment of the present invention removed.
FIG. 4 is a partial cross-sectional front view of a bearing device employing a conventional boat-shaped cooling water jacket with one cooling water inlet and one outlet.
5 is a plan view showing a state where a jacket lid 45 of FIG. 4 is removed. FIG.
FIG. 6 is a partial sectional front view of a bearing device employing a conventional cooling water jacket having two cooling water inlets and two outlets.
7 is a plan view showing a state in which the jacket lid 65 of FIG. 6 is removed. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bearing box 1a Upper half 1b Lower half 2 Cooling water jacket 2a Cooling water inlet 2b Cooling water outlet 3 Cooling water inflow hole 4 Cooling water outflow hole 5 Jacket lid 10 Bearing D Recess L Rib P Dividing surface

Claims (1)

In a bearing device in which a cooling water inflow hole and a cooling water outflow hole are formed in a bearing box that accommodates the rolling bearing, and a cooling water jacket is formed therebetween.
The cooling water jacket has substantially uniform dimensions in the axial direction of the bearing box, and two cooling water inlets communicating with the cooling water inflow hole at one end of both circumferential ends, Two cooling water outlets communicating with the cooling water outflow hole are formed at the other end, respectively, and the bearing box or the lid of the cooling water jacket protrudes toward the cooling water jacket. A bearing device in which ribs are formed, and the dimension of the ribs in the axial direction of the bearing box gradually decreases from both circumferential ends of the cooling water jacket toward the center.

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