JPH04101824U - Bearing box structure - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the risk of bearing seizure and lubricating oil deterioration by keeping the oil level constant even when the bearing box is tilted when the belt is stretched. [Structure] A rolling bearing 19 rotatably supports a rotating shaft 4 that transmits power via a belt. Further, the rolling bearing 19 is lubricated by lubricating oil in an oil tank 18 formed in the bearing box 20. Therefore, the rotating shaft 4 rotates stably due to the lubricating oil. Even when the bearing box 20 is tilted and supported by the support base, the oil level height is maintained constant by the oil tank bottom 18a having an arcuate shape coaxial with the rolling bearing 19.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention has a bearing box structure that maintains a uniform oil level and extends the life of the bearing. Regarding.

0002

[Conventional technology]

Conventionally, power is transmitted to the driven side via a belt wrapped around a pulley. High-speed medium-capacity electric motors are used in a variety of applications. Also, such electricity Oil-bath type rolling bearings are mainly used for the bearing structure of motors. Oil baths are used to extend the life of motor bearings.

0003 An example of the electric motor described above is adopted in the power transmission structure shown in Figure 3. Are known.

0004 As shown in FIG. 3, the electric motor 1 is mounted on a support stand 3 that is tilted around a hinge installed on. The rotation of the driven-side pulley 6 and the motor 1 located at the top and bottom of Fig. 3 Take up the slack in the belt 7 wrapped around the pulley 5 attached to the rotating shaft 4 In some cases, the distance between the pulleys 5 and 6 can be adjusted by changing the inclination of the support base 3 using the hinge 2. It was being varied. Incidentally, the inclination of the support stand 3 is determined by a support stand rotation mechanism and a stopper (not shown). It can be easily changed by using a computer or the like.

[0005] Further, the rotating shaft 4 of such an electric motor 1 is generally an oil bath lubricated type as shown in FIG. is supported by a bearing box 10 via a rolling bearing 9. This bearing box 10 is an oil tank Since the part numbered 8 is rectangular, the inclination of the support base 3 prevents oil from moving against the bearing 9. This will cause surface changes.

[0006] That is, the support base 3 is tilted from a horizontal state as shown by the two-dot chain line in FIG. Then, the oil level will tilt from the normal oil level to the tilted oil level, which is indicated by the arrows in Figure 4. . Therefore, the oil level height varies depending on the inclination of the oil tank 8, and in this case, the immersion depth increases. The Rukoto.

[0007]

[Problem that the idea aims to solve]

As mentioned above, if the oil level changes, the following problems will occur.

[0008] For example, when the oil level rises, the portion of the rolling bearing 9 immersed in lubricating oil increases, The lubricating oil is stirred by the bearing 9 and the stirring heat increases. Therefore, this heat causes the bearing temperature to increase. increases, accelerating the deterioration of the lubricating oil. This also causes oil leaks. .

[0009] On the other hand, when the oil level falls, the portion of the rolling bearing 9 that is immersed in lubricating oil decreases, and the oil level decreases. The breakage may cause the bearing 9 to seize.

0010 Additionally, in order to resolve these issues, special equipment will be installed to control the oil level. A structure that minimizes oil level fluctuations by making the structure and oil tank larger than necessary for lubrication is considered. However, it had drawbacks such as high cost and a large bearing box.

[0011]

[Means to solve the problem]

The bearing box structure according to the present invention transmits power using a belt wrapped around it. A bearing that supports a rotating shaft to which a transmission structure is attached and is lubricated by an oil bath is In the built-in bearing box structure, the bottom of the oil tank inside the bearing box is coaxial with the axis of the bearing. It is characterized by having a circular arc shape.

0012

[Effect]

The rotation of the rotating shaft is transmitted by a power transmission structure that transmits power via a belt. . Further, the bearing is lubricated by the oil bath and rotatably supports the rotating shaft. this axis Even if the bearing box containing the bearing is tilted, the oil tank remains in an arc shape that is coaxial with the axis of the bearing. Therefore, the lubricating oil level does not fluctuate.

[0013]

【Example】

An embodiment of the bearing box structure of the present invention is shown in FIGS. 1 to 3, and based on these figures, This embodiment will now be explained. In addition, the same members as those explained in the conventional technology have the same meaning. Reference numerals are given and duplicate explanations are omitted.

[0014] Power transmission structure including the belt 7, pulleys 5, 6, support base 3, etc. shown in FIG. , a bearing box 20 as shown in FIG. 1 is employed.

[0015] As shown in FIG. 1, the bottom 18a of the oil tank 18 forming the lower inner surface of the bearing box 20 is It has an arc shape coaxial with the axis of the rolling bearing 19. Therefore, it is more arcuate than before. A cylindrical oil tank 18 is formed with the inner upper part 18b of the bearing box 20. Ru.

[0016] As a result, even if the electric motor 1 is tilted to tension the belt 7, the rolling bearing 19 The height of the oil level must always be maintained at a constant and appropriate level, as shown by the arrow. It becomes.

[0017] In addition, the oil level gauge 21 disposed below the shaft center of the rolling bearing 19 is also equipped with the oil level gauge 21 shown in FIG. Similarly, a coaxial arc-shaped appropriate oil level indication line 22 is drawn as shown in FIG. This makes it easy to check the oil level.

[0018] In addition, in this embodiment, a structure using hinges 2 is adopted to tilt the support stand 3. However, other known structures may be used.

[0019]

[Effect of the idea]

According to the bearing box structure of the present invention, the bottom of the oil tank has a circular arc shape coaxial with the shaft center. As a result, while keeping the amount of lubricating oil constant, the oil level is always maintained at a constant and appropriate level relative to the bearing. can maintain good lubrication.

[0020] In other words, it is not possible to use special equipment to control the oil level or use a larger oil tank than necessary. This means that the oil level can be easily maintained at a constant level.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the inside of a bearing box of an embodiment of the bearing box structure of the present invention.

FIG. 2 is an explanatory diagram of an oil level gauge used in the bearing box of FIG. 1;

FIG. 3 is a schematic diagram illustrating a power transmission structure using an embodiment of the present invention and a conventional bearing box;

FIG. 4 is a sectional view showing a conventional bearing box structure.

[Explanation of symbols]

1 Electric motor 2 Hinge 3 Support stand 4 Rotation axis 5,6 Pulley 7 Belt 8,18 Oil tank 18a bottom 9,19 Rolling bearing 10,20 Bearing box

Claims (1)

[Scope of utility model registration request] Claim 1: In a bearing box structure in which a bearing that supports a rotating shaft to which a power transmission structure is attached that transmits power by a belt wrapped around the shaft and is lubricated by an oil bath is built in, the oil tank in the bearing box A bearing box structure characterized in that a bottom part has an arc shape coaxial with the axis of the bearing.