JPS6182021A - Bearing housing - Google Patents

Abstract

PURPOSE:To prevent the leak of the discharged oil from the divided surface by sealing the gap part by the sealing air supplied from a groove formed onto the divided surfaces of a bearing housing. CONSTITUTION:Sealing-air feeding holes 7 and 8 are connected onto a divided surface 1, and a groove 10 is formed so as to pass between an oil discharging chamber 9 and a fastening-bolt hole 2. In other words, even if the abnormal reduction of the contact surface pressure or the generation of gap is generated in the metal touch part of the divided surface, the sealing air supplied from a groove 10 part seals the gap part, and the trouble of leak of the discharged oil outside can be eliminated, by forming the sealing-air groove part 10 onto the divided surface 1.

Description

[Detailed Description of the Invention] [Background of the Invention] In bearings that have conventionally been subjected to forced lubrication using lubricating oil, the issue of how to prevent the lubricating oil (drained oil) from leaking to the outside has been highly praised. It was an assignment.

In particular, if the bearing and its housing are placed in a narrow and high-temperature atmosphere, there is a high risk that even a small leak of lubricating oil could cause a major disaster such as a fire. It is necessary to have a housing structure that does not leak even in situations where there is damage.

FIG. 5 shows the structure of a bearing nozzle currently in use.

In the figure, 1 is a housing dividing surface, 2 is a bolt hole for tightening the housing, 3 is a bearing metal, 4 is a shaft, 5 and 6 are labyrinth seals provided on both sides of the bearing, 7 and 8 are seal air supply holes, 9 is an oil drainage chamber.

The first measure against oil leakage to the outside is to prevent the leakage of waste oil that leaks to the outside along the shaft, but as shown in Figure 5, it is necessary to prevent oil leakage from the outside oil drain chamber and the pressure higher than the outside pressure. By supplying pressurized seal air to the seal air supply holes 7 and 8 and releasing this seal air from the middle part of the labyrinths 5 and 6, it is possible to prevent waste oil from leaking outside through the labyrinths 5 and 6. To prevent.

The second measure against leakage is to prevent leakage from the housing dividing surface.

The bearing housing must have a split structure due to the necessity of bearing assembly and maintenance, and the nousing split surface 1
However, conventional measures to prevent oil leakage from this dividing surface have been
The method used has been to finish the split surfaces as flat and smooth as possible, and then tighten bolts to bring the split surfaces into contact with each other with a so-called metal touch to prevent leakage.

This method is effective when the bearing nozzle is installed in a place with relatively little temperature change and there is enough space to place the bolts to generate sufficient contact surface pressure. There is no problem, but if the bearing housing is exposed to high temperatures and rapid temperature changes, and is placed in a narrow space, contact surface pressure may occur due to thermal deformation of the housing due to high temperatures and loosening of tightening bolts due to temperature changes. There is a risk of a decrease in the bearing capacity and the formation of a gap, and furthermore, the bearing must be installed in a narrow space. The downsizing of the bearing does not allow for the optimum arrangement and number of tightening bolts, and there is a good possibility that the contact surface pressure will further decrease. (% 1986-152105, 1987-152105, 1987-
83609) [Object of the Invention] An object of the present invention is to provide a bearing housing structure that does not cause leakage from the dividing surface.

[Summary of the invention]

The key point of the present invention is to focus on the fact that seal air is used for shaft sealing, and to use seal air also for sealing on split surfaces.

[Embodiments of the invention]

An example is shown in FIG. The bearing housing structure is basically the same as that shown in FIG. In FIG. 1, 10 is a groove provided on the dividing surface 1 with a path that connects the seal air supply holes 7 and 8 and passes between the oil drain chamber 9 and the tightening bolt hole 2. .

Reference numeral 11 indicates an opponent nozzle that comes into contact with the dividing surface 1.

As shown in Fig. 1, by providing a seal air groove 10 on the split surface, in the unlikely event that the metal touch part of the split surface
Even if there is an abnormal drop in the contact surface pressure or a gap occurs, the sealing air from the groove 10 will seal the gap, eliminating the risk of waste oil leaking to the outside.

That is, the seal air supply holes 7 and 8 are generally designed to have a pressure of around IKg/Cr11"g, but the pressure in the exhaust chamber is generally at a level of 10 to 100 m water column outside the reed. is considered to be atmospheric pressure, so if a gap occurs inside the groove 10 of the dividing surface (on the oil drain chamber side), the sealing air will flow from the groove 10 into the oil drain chamber with a pressure of approximately IK?10n2. 9 to prevent waste oil from flowing outside.

FIG. 2 shows another embodiment.

In this figure, 12 is installed in a groove 10 that connects the seal air supply holes 7 and 8 and passes between the oil drain chamber 9 and the tightening bolt hole, as in Figure 1. This sealing gasket is designed to prevent the leakage of waste oil at the dividing surface 1.

By adding the gasket 12, leak prevention by the gasket is added in addition to leak prevention by sealing air, and reliability against drain oil leaks is further increased. Furthermore, even if a gap occurs at the dividing surface, effective sealing can be achieved with less sealing air flow.

The shape of the gasket 12 may be any shape as long as it is capable of sealing at the divided surface and has a space in which sealing air can flow through the groove 10 to seal the divided surface.

The shape shown in FIG. 2 will be effective in improving sealing performance and reducing seal air outflow when a gap occurs on the dividing surface outside the groove 10 (on the tightening bolt side).

As for other gasket shapes, for example, the shape shown in Fig. 3 is effective for the gap in the dividing plane inside the groove 10, and the shape shown in Fig. 4 is effective for both. However, it is thought that it is necessary to make the groove width large, and depending on the size of the bearing nozzle, it may be difficult due to dimensions.

The present invention is particularly effective for bearings that are installed in a high-temperature atmosphere, where the atmospheric temperature fluctuates rapidly, and in a narrow space.

〔Effect of the invention〕

According to Kaikinmei, leakage of waste oil from the split surface can be completely prevented, greatly improving the operational reliability of the bearing.

[Brief explanation of the drawing]

FIG. 1 is an embodiment of a bearing having a seal air groove according to the present invention, FIG. 2 is an embodiment of a bearing having a gasket installed in the seal air groove of the present invention, and FIG. FIG. 4 is a diagram showing an embodiment of the gasket shape of the present invention, and FIG. 5 is a diagram showing the structure of a conventional bearing having a dividing surface. 12...Gasket.

Claims (1)

[Claims] 1. Connect the seal air supply holes provided at both ends of the bearing housing on the dividing surface of the bearing housing, and connect the seal air supply holes provided at both ends of the bearing housing between the inner bearing, the oil drain chamber and the outer tightening bolt. A bearing housing characterized by having a seal air groove that passes through the bearing housing. 2. The bearing housing according to claim 1, characterized in that the seal air groove portion is provided with a gasket.