JPH0236799Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a stern tube bearing device, and particularly to a forced cooling type stern tube bearing device having a structure for forcibly cooling a bearing material.

As shown in FIGS. 1 and 2, a conventional stern tube bearing device for a ship is attached to the end of the hull 1 via a hull attachment liner 8, and the propeller shaft 4 has a sleeve fixed to its surface. , are supported by a bearing liner 3 via bearing members 5 arranged at predetermined intervals. A bearing water sealing device 7 is also provided to prevent seawater 2 from entering.

As the bearing material is submerged in water, the bearing material can be cooled naturally by heat radiation, or a cooling water pipe (not shown) may be provided between the bearing liner 3 and the hull-mounted liner 8, and cooling water may be supplied to the propeller. This was a method of cooling by flowing in the axial direction of the gap between the shaft 4 and the bearing material 5 or the bearing material gap 6.

In addition, lignum vitae material is mainly used as a self-lubricating material for the bearing material 5, but as shown in Fig. 3, when the bearing temperature rises due to startup, stoppage, sudden maneuvering, shaft misalignment, etc. Resin and gum precipitate from the lignum vitae material, causing a rapid increase in tangential force, ie, friction coefficient, and this precipitate closes the bearing material gap 6, making cooling difficult.

In addition, in shallow water, if solid foreign matter such as sand gets in, it cannot be removed, so the bearing material 5 sometimes suffers abnormal wear, especially in the bearing material on the lower surface of the propeller shaft, which has disadvantages such as the need to replace it in a short period of time. There is.

The object of the present invention is to provide a forced cooling type stern tube bearing device that eliminates the above-mentioned drawbacks and makes it possible to extend the replacement period for bearing materials.

Embodiments of the present invention will be described below with reference to FIGS. 4 and 5.

FIG. 4 is a sectional view of an embodiment of the present invention, and FIG. 5 is a sectional view taken along line BB in FIG.

As shown in the figure, the present invention
In a stern tube bearing device in which the bearing liner is supported through a bearing material 5 and a bearing liner 3, the bearing liner is sealed with a bearing inner liner 9 whose outer circumferential surface shape is formed into a concave section and the concave portion of the bearing inner liner 9. The inner bearing liner 9 includes bearings located on the lower half circumference of the bearing material 5 arranged at predetermined intervals on the inner circumference. a cooling water spout 12 communicating with the cooling water chamber 11 in the gap 6 between the materials;
An air vent hole 13 and a cooling water outlet 14 communicating with seawater are provided at the rear end of the recess, and a cooling water inlet 16 passing through the bearing liner 10 and the liner 8 attached to the hull of the liner and communicating with the cooling water chamber 11.
is provided, and the cooling water inlet 16 is connected to the cooling water pipe 15.
The bearing material 5 is cooled by jetting the cooling water introduced into the cooling water chamber 11 through the cooling water outlet 12 between the bearing materials.

As explained above, in the present invention, cooling water is forcibly ejected from the bottom of the propeller shaft, so even if frictional heat is generated due to rotation, cooling can be done efficiently, and even if solid foreign matter gets mixed in, the bearing Since it flows in the axial direction along the material gap and can be easily discharged overboard, it is possible to suppress wear on the bearing material as much as possible.

In addition, in the above embodiment, an example was explained in which the cooling water outlet was provided in the gap between the bearing materials, but if rubber or synthetic resin is used for the bearing material, the outlet may be provided through the bearing material. The same effect can be obtained even if

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventionally used stern tube bearing device, Fig. 2 is a sectional view taken along line A-A in Fig. 1,
Fig. 3 is a diagram showing the relationship between the temperature of the bearing material lignum vitae and the tangential force, that is, the coefficient of friction, Fig. 4 is a sectional view of an embodiment of the present invention, and Fig. 5 is a sectional view taken along line B-B in Fig. 4. . 1... Hull, 2... Seawater, 3... Bearing liner, 4... Propeller shaft, 5... Bearing material, 6... Bearing material gap, 7... Bearing water sealing device, 8... Hull mounting liner, 9...Bearing inner liner, 10...Bearing outer liner, 11...Cooling water chamber, 12...Cooling water outlet, 13...Air vent hole, 14...Cooling water outlet, 15...Cooling water pipe, 16... ...Cooling water inlet.

Claims (1)

[Scope of utility model registration request] In a stern tube bearing device that supports a ship propeller shaft via a bearing material and a bearing liner, the bearing liner is combined with a bearing inner liner whose outer peripheral surface is formed into a concave section and a bearing that seals the concave portion of the bearing inner liner. and an outer liner, and the recess is used as a cooling water chamber, and the bearing inner liner includes gaps between the bearing materials located on the lower half circumference of the bearing materials arranged at predetermined intervals on the inner circumferential surface. A cooling water spout communicating with the cooling water chamber is provided in the bearing material, and an air vent hole and a cooling water outlet communicating with seawater are provided at the rear end of the recess, and the bearing material is further provided with a cooling water outlet communicating with the cooling water chamber, and further passing through the bearing outer liner and the hull attachment liner of the liner. A cooling water inlet leading to the cooling water chamber is provided, and the cooling water introduced into the cooling water chamber from the cooling water pipe through the cooling water inlet is jetted out from the cooling water outlet between the bearing materials to cool the bearing material. A forced cooling type stern tube bearing device.