JPH0228007B2 - RAININGUSHAFUTO - Google Patents

Description

[Detailed description of the invention]

[Field of Application of the Invention] The present invention relates to a seawater pump and a lining shaft used in ships and the like. [Background of the Invention] Conventionally, shafts of pumps used in corrosive environments, such as seawater pumps, need to not only have a certain level of strength, but also be inexpensive and have excellent corrosion resistance. Further, in the shaft, the joint parts of the bearing, impeller, coupling, etc. require excellent sliding properties and contact strength, so it is necessary to expose the metal members of the shaft. Furthermore, when inspecting or straightening a shaft for bending, corrosion-resistant metal members may be exposed at several locations in the axial direction of the shaft, and even if the shaft is accidentally hit, the surface of the shaft and the interface between the rubber lining and the metal member may be damaged. It is necessary that no cracks occur. Therefore, conventionally, as shown in FIG. 1, a shaft was constructed by using a carbon steel material for the shaft core 12, attaching a corrosion-resistant metal member such as a stainless steel ring 13 to the surface thereof, and further applying a rubber lining 14 to the ring 13. 11 are used. In such a shaft 11, corrosion occurs from the outer surface along the joint interface 15 between the stainless steel ring 13 and the rubber lining 14, and as this corrosion progresses, there is a risk that the rubber lining layer at the joint interface 15 will peel off. There is. [Object of the Invention] It is an object of the present invention to provide a lining shaft that eliminates the above-mentioned drawbacks, prevents corrosion from occurring at the joint interface between the metal member and the rubber lining material, and prevents the lining layer from peeling off. . [Summary of the Invention] A lining shaft according to the present invention is a lining shaft that is integrally configured by mounting a metal member and a rubber lining that are bonded to each other on a shaft core member, in which the rubber lining is bonded to the metal member through an interface. The wall thickness of the soft rubber between the hard rubber and the metal member is 0.5 to 2.0.
It is configured to form in mm. [Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings. In Fig. 3, 1 is a lining shaft, and this lining shaft 1 is connected to a carbon steel shaft core 2.
It is integrally constructed with a stainless steel ring (metal member) 3 and a rubber lining 4 attached thereto. The rubber lining 4 is interfacial with the ring 3
A soft rubber 4a made of soft rubber, such as JIS A type natural rubber with a hardness of 52 to 53, is bonded to the soft rubber 4a, and a hard rubber, such as natural rubber, stored inside the soft rubber 4a is box-vulcanized. JIS with
It is made of D-type hard rubber 4b with a hardness of 68 to 70. The thickness t of the soft rubber _4a1 interposed between the hard rubber 4b, the ring 3, and the shaft core 2 is thin, that is, 0.5 to 2.0 mm. The thickness t is thicker, for example, 2~2 as shown in FIG. 4D.
When formed to a thickness of 5 mm, the soft rubber 4 of the thick part t
D is not preferable because it may be deformed and peeled off by the centrifugal force accompanying the rotation of the shaft. Next, an example will be described. The present example (shaft) shown in FIG. 3 described above and each separate sample (shaft) constructed as shown in FIGS. The rubber lining layer was examined for peeling by rotating at 1500 rpm. After that, the rubber lining layer is removed and the ring 3
and the bonding interface 5 between the rubber lining 4, 4A to 4E
The corrosion depth was measured. Furthermore, the interface 5
The same test as above was conducted after hitting four circumferential parts of the outer surface of the rubber with a diameter of 10 mm using a large hammer. In sample A, the rubber lining 4A consists only of soft rubber, and in sample B, the rubber lining 4B consists of a hard rubber 4B _a inserted into a hard rubber 4B _b , and this soft rubber 4B _a and ring 3
The wall thickness t of the hard rubber 4B _b between the two is configured to be 0.5 to 2.0 mm. In addition, in sample C, rubber lining 4
C is constructed by laminating soft rubber 4C _a on hard rubber 4C _b , in sample D the rubber lining 4D is constructed as described above, and in sample E the rubber lining 4E is constructed only of hard rubber. . The other structures in each of these samples A to E are the same as the shaft of the present example shown in FIG. 3, so the explanation will be omitted. The samples shown in FIGS. 3 and 4 were tested as described above, and the results are shown in Table 1. This table shows the rubber lining after the spin test.

【table】

〔Effect of the invention〕

As described above, according to the present invention, reliability can be improved by preventing corrosion from occurring at the joint interface between the metal member and the rubber lining material and preventing peeling of the lining layer.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional rubber lining shaft, FIG. 2 is an enlarged view of the X section in FIG. 1, FIG. 3 is a sectional view showing an embodiment of the rubber lining shaft of the present invention, and FIGS. E is a cross-sectional view of each experimental sample (rubber lining shaft). 1... Lining shaft, 2... Shaft core, 3...
...Ring, 4...Rubber lining, 4a...Soft rubber, 4b...Hard rubber.

Claims (1)

[Claims] 1. A lining shaft that is integrally configured by mounting a metal member and a rubber lining that are bonded to each other on a shaft core member, and a soft rubber that is bonded to the rubber lining and the metal member via an interface;
A lining shaft characterized in that it is formed of this soft rubber and a hard rubber stored inside, and the thickness of the soft rubber between the hard rubber and the metal member is formed to be 0.5 to 2.0 mm.