JPH0443623Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to underwater rubber bearings, and is specifically designed to prevent the rubber inner cylinder at the end of the bearing from peeling off from the outer periphery and its progress. .

[Conventional technology]

Conventionally, a rubber bearing used underwater as a vertical pump or a stern bearing of a ship, etc., has a rubber inner cylinder 2 coated with adhesive on the inner peripheral surface of a metal outer cylinder 1, as shown in FIG. The shaft 6 inserted into the inner cylinder 2 is attached in the axial direction provided on the inner peripheral surface (bearing surface) of the inner cylinder 2. The water supplied to the plurality of grooves 3 parallel to the inner cylinder 2 and the gap 3' between the inner circumferential surface of the inner cylinder 2 and the shaft 6 acts as a lubricant and rotates.

When this underwater rubber bearing is used for a long period of time, the axis of the inner cylinder 2 may be caused by minute defects existing on the inner peripheral edge of the axial end surface of the outer cylinder 1, corrosion of the outer cylinder metal, shrinkage of the inner cylinder rubber, etc. A phenomenon may occur in which the rubber at the directional end portions peels off from the outer cylinder 1 as shown in FIG. Once this peeling phenomenon of the inner cylinder rubber occurs, it progresses and gradually increases as the bearing usage period progresses due to electrochemical effects such as crevice corrosion and shrinkage residual stress of the inner cylinder rubber. As the inner diameter gradually decreases, it is no longer possible to maintain the necessary bearing clearance between the shaft 6 and the shaft 6, and the shaft 6 will eventually come into contact with the shaft 6, or the shaft 6 will be tightened, impairing the bearing performance.

In order to prevent the occurrence and progression of such a peeling phenomenon of the inner cylinder 2, various measures have been taken in the past, such as the measures shown in FIGS. 9 to 12.

The bearing shown in FIG. 9 has a tapered step surface 1a formed by molding the inner circumferential surface of the outer cylinder 1 on the axial end side to be larger than the inner diameter on the axial center side, and improves the adhesiveness of the inner cylinder rubber. At the same time, the progress of peeling and shrinkage of the inner diameter of the inner cylinder rubber during peeling are prevented.

The bearing shown in FIG. 10 is provided with a threaded portion 1b on the inner circumferential surface of the outer cylinder 1 on the axial end side to increase the adhesive area with the inner cylinder rubber and prevent the occurrence and progression of peeling. There is.

The bearing shown in FIG. 11 has a flange portion 2a provided on the radially outer side of the outer peripheral surface on the axial end side of the inner cylinder 2.
is adhered to the axial end face of the outer cylinder 1 to prevent the progress of peeling of the end of the inner cylinder rubber.

In the bearing shown in FIG. 12, the flange portion 2a of the inner cylinder 2 is bonded to the axial end surface of the outer circumference 1 in the same way as in FIG. A metal ring 4 is brought into contact with the outer cylinder 1, and a fixing bolt 5 is screwed into the outer cylinder 1 to tighten the flange portion 2a of the inner cylinder 2, thereby preventing the end part of the inner cylinder rubber from peeling off and its progress.

[Problem that the invention attempts to solve]

Among the various conventional bearings mentioned above, in the bearing shown in FIG. 9, the step surface 1a prevents the inner cylinder rubber from falling off the outer cylinder 1 after the end peels off, but the inner cylinder rubber The bearing shown in FIG. 10 is not effective in preventing end peeling itself, and the end of the inner cylinder rubber bites into the threaded part 1b of the outer cylinder 1, making it difficult to peel and preventing the progress of peeling. However, in either case, a sufficiently stable effect cannot be obtained, and the bearing shown in FIG. However, it is somewhat advantageous because once the flange portion 2a of the inner cylinder 2 has peeled off, there will be a lapse of time until the entire adhesive surface of the flange portion 2a peels off. It is impossible to prevent the progression of edge peeling over a long period of time, and the
The bearing shown in FIG. 2 is more effective than the bearing shown in FIG. 11 in that it can prevent the flange portion 2a of the inner cylinder 2 from peeling off and its progress, but it requires a metal ring 4 and a fixing bolt 5. Therefore, in addition to increasing the number of attached parts, it is necessary to fill the bolt holes of the metal ring 4 with filler to prevent corrosion of the screw holes for the fixing bolts 5, which makes the installation process complicated and time-consuming. Furthermore, since the metal ring 4 must be attached to the outside of the bearing, the product not only lacks a sleek appearance, but also becomes an obstacle when assembled into the bearing case. There's a problem.

The object of this invention is to solve the above-mentioned problems and provide an underwater rubber bearing that can permanently prevent end peeling of the inner cylinder rubber and its progression at a low cost.

[Means for solving problems]

The underwater rubber bearing of this invention has a circumferential surface that connects the tops of the lubrication grooves inward in the axial direction from the axial end of the inner circumferential surface of the inner circumferential surface of the rubber inner cylinder, which is bonded to the inner circumferential surface of the metal outer cylinder. A notch is provided whose inner diameter surface is a circumferential surface radially outward from A composite ring, to which a metal or synthetic resin ring having the same outer diameter as the rubber ring is bonded, is press-fitted axially inside the rubber ring.

The outer diameter of the single ring is larger than the diameter of the inner diameter surface of the notch portion of the inner cylinder, and the inner diameter is approximately equal to the diameter of the circumferential surface connecting the tops of the lubricating grooves of the inner cylinder.

The composite ring has an outer diameter larger than the diameter of the inner diameter surface of the notch in the inner cylinder, an inner diameter that is the same as the inner peripheral surface of the inner cylinder, and a ring on the inner peripheral surface for lubrication of the inner cylinder. Lubricating grooves having the same cross-sectional area or larger cross-sectional area as the grooves are formed at the same pitch.

〔Example〕

Examples of this invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional side view showing a first embodiment of this invention, and FIG. 2 is an end view of FIG. 1.

The outer cylinder 10 is made of a metal with excellent corrosion resistance, such as brass or stainless steel, and the inner peripheral surface of the outer cylinder 10 is provided with an inner cylinder 12 made of synthetic rubber with excellent wear resistance and oil resistance. are vulcanized and bonded using adhesive. A plurality of lubrication grooves 14 (eight in the figure) parallel to the axial direction are provided on the inner circumferential surface of the inner cylinder 12 at the same pitch.

The inner circumferential surface of the left and right axial ends of the inner cylinder 12 of the underwater rubber bearing described above has notches 16a, 1 with appropriate lengths extending from the respective end surfaces toward the axially inner side.
6b is provided. These notches 16a, 16b
The inner diameter surface of the inner cylinder 12 has a diameter larger than the diameter D of the circumferential surface connecting the tops of the lubrication grooves 14 of the inner cylinder 12.

In the notches 16a and 16b of the inner cylinder 12, a single ring 18 made of metal or synthetic resin is provided.
a and 18b are fitted together by press fitting. The single rings 18a and 18b have an outer diameter slightly larger than the diameter of the inner diameter surface of the cutout portions 16a and 16b of the inner cylinder 12, and an inner diameter that is equal to the diameter of the circumferential surface connecting the tops of the lubrication grooves 14 of the inner cylinder 12. The outer diameter dimension is approximately equal to D, and the width is equal to the width (axial length) of the notches 16a, 16b of the inner cylinder 12.

It is preferable to use the same material as the outer cylinder 10 as the metal material for the single rings 18a and 18b, and as the synthetic resin material, it is preferable to use the same material as the outer cylinder 10.
It is preferable to use one with excellent corrosion resistance.

When attaching the single rings 18a, 18b to the notches 16a, 16b of the inner cylinder 12, it is sufficient to press fit them in parallel to the axial direction using a press machine, etc. Both ends in the axial direction are firmly pressed against the inner peripheral surface of the outer cylinder 10.

FIG. 3 shows a second embodiment of this invention, in which the inner cylinder 1
The axial end of the inner diameter surface of the notch 16a of the inner cylinder 12 is formed to have a smaller diameter than the axially inner part to provide a stepped surface 16c.
A stepped ring having a small diameter portion 18c and a large diameter portion 18d with an outer diameter slightly larger than the inner diameter of the axial end portion and the axial inner portion of 6a is press-fitted.

According to this embodiment, the press-fitted single ring 1
8a is a step surface 16c of the notch 16a of the inner cylinder 12
Even if an external force is applied to the single ring 18a, it will not fall off from the inner cylinder 12 and can be firmly held.

FIG. 4 shows a third embodiment of this invention, in which the inner cylinder 1
An annular recess 16d with a semicircular cross section is provided at the axially inner end of the inner diameter surface of the notch 16a of No. 2, and a tapered portion 16d whose diameter expands axially outward is provided at the axially outer end.
6e, and a single ring 18a having the same shape as the first embodiment is press-fitted therein.

According to this embodiment, when the single ring 18a is press-fitted, the annular recess 16d of the notch 16a of the inner cylinder 12 and the tapered part 16e serve as relief parts, and the force received by the axial end of the inner cylinder 12 during press-fitting is reduced. This makes the press-fitting operation easier.

FIG. 5 shows a fourth embodiment of this invention, in which the outer cylinder 1
A large diameter portion 10a is formed on the axial end side of the inner circumferential surface of 0, and a tapered step surface 10b is provided whose diameter increases inward in the axial direction from the edge of the inner circumferential surface on the axially inner side. The thickness of the rubber at the notch 16a of the inner cylinder 12 is increased. The cross-sectional shape of the notch 16a of the inner cylinder 12 and the shape of the single ring 18a are the same as in the first embodiment.

According to this embodiment, since the press-fitting allowance at the axial end of the inner cylinder 12 when press-fitting the single ring 18a becomes large, it is possible to prevent long-term stress reduction due to permanent deformation of the rubber against the single ring 18a. Moreover, the dimensional tolerance of the fitting portion can also be largely tolerated.

FIG. 6 shows a fifth embodiment of this invention, in which the cross-sectional shape of the notch 16a of the inner cylinder 12 is the same as that of the first embodiment, but the ring to be press-fitted into the notch 16a is a rubber body ring. 19a and metal ring 18a
It is constituted by a composite ring 20a with.

The rubber ring 19a constituting the composite ring 20a has an outer shape similar to the notch 16 of the inner cylinder 12.
a is slightly larger than the diameter of the inner diameter surface of the inner cylinder 12, the inner diameter is the same diameter as the inner peripheral surface of the inner cylinder 12, and the inner peripheral surface has the same cross-sectional area as the lubrication groove 14 of the inner cylinder 12 or a larger cross-sectional area. Lubrication grooves 21 having the same pitch are provided parallel to the axial direction, and are formed to have the same width as the width of the notch 16a of the inner cylinder 12. It is preferable to use the same rubber material as that for the inner tube 12 as the molding material for the rubber body ring 19a. Further, the outer diameter of the metal body ring 18a is the same as that of the rubber body ring 1.
The outer diameter of the rubber body ring 19a is the same as that of the rubber body ring 19a.
It is molded narrower than the rubber body ring 19.
It is vulcanized and bonded to a part of the outer circumferential side of a.

The above composite ring 20a is a metal ring 1
With the exposed end surface side of 8a facing the press-fitting direction, the lubrication groove 21 of the rubber body ring 19a is aligned with the lubrication groove 1 of the inner cylinder 12.
4 and the notch 16a of the inner cylinder 12.
It is press-fitted into the

When configured as in this embodiment, the composite ring 2
Since the inner peripheral surface of the rubber ring 19a of 0a has the same cross-sectional shape as the bearing surface of the inner cylinder 12, the bearing load can also be received by the composite ring 20a.
The bearing has a large load capacity. Further, since the metal ring 18a is not exposed on the end face of the bearing, the first
or metal ring 1 compared to the bearing of the fourth embodiment.
8 corrosion can be prevented, and the appearance becomes even smarter.

The metal ring 18a of the composite ring 20a is
Similar to each of the above embodiments, a material made of synthetic resin can also be used.

Note that this fifth embodiment can also have the same configuration as the second to fourth embodiments.

[Effect of idea]

As explained above, the underwater rubber bearing of this invention has a single ring made of metal or synthetic resin, or a rubber ring in the notch provided on the inner peripheral surface of the axial end of the rubber inner cylinder. Because it has a structure in which a composite ring in which a single link made of metal or synthetic resin is glued is press-fitted into a part of the outer circumferential surface, the rubber at the axial end of the inner cylinder does not touch the inner circumferential surface of the outer cylinder. There is no forcible crimping and peeling, and even if there is a minute defect on the inner circumferential surface of the axial end of the outer cylinder, it remains sealed by the crimped inner cylinder rubber. Electrochemical effects such as crevice corrosion and shrinkage residual stress of the inner cylinder rubber do not occur, making it possible to prevent the progression of peeling at the axial ends of the inner cylinder rubber for a long period of time.

In addition, according to this invention, a single ring or a composite ring can be press-fitted with a simple operation using a press machine, etc., and accessory parts such as fixing bolts for installation are not required. Coupled with the fact that it does not require plugging work to prevent corrosion,
An underwater rubber bearing that can be manufactured at low cost can be obtained.

Furthermore, according to this invention, since the single ring or composite ring is housed inside the bearing,
It does not lack in appearance and does not become an obstacle when installed in a bearing case.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a first embodiment of this invention, FIG. 2 is an end view thereof, and FIG. 3 is a sectional view showing a part of the axial end side according to a second embodiment of this invention. FIG. 4 is a sectional view showing a part of the axial end side according to the third embodiment of the invention, FIG. 5 is a sectional view showing a part of the axial end side according to the fourth embodiment of the invention, Fig. 6 is a sectional view showing a part of the axial end side according to the fifth embodiment of this invention, Fig. 7 is a vertical sectional side view showing how the underwater rubber bearing is used, and Fig. 8 is the end of the inner cylinder. 9 to 12 are cross-sectional views showing a part of a conventional underwater rubber bearing on the axial end side, respectively. In the figure, 10 is an outer cylinder, 12 is an inner cylinder, 14 is a lubricating groove in the inner cylinder, 16a and 16b are notches in the inner cylinder, 1
8a and 18b are metal or synthetic resin rings, 19a is a rubber ring, 20a is a composite ring, and 21 is a lubrication groove of the composite ring.

Claims (1)

[Scope of utility model registration request] In a full-molded underwater rubber bearing in which a rubber inner cylinder having a plurality of axially parallel lubrication grooves formed on the inner peripheral surface is adhered to the inner peripheral surface of a metal outer cylinder, the inner cylinder A notch is provided axially inward from the axial end of the inner circumferential surface of the inner cylinder, and the inner diameter surface is a circumferential surface that is radially outer than the circumferential surface that connects the tops of the lubricating grooves of the inner cylinder. A single ring made of a metal or synthetic resin body is press-fitted into the notch, and has an outer diameter that is larger than the diameter of the inner diameter surface of the notch, and an inner diameter that is approximately equal to the diameter of the circumferential surface that connects the tops of the lubrication grooves. or have an outer diameter larger than the diameter of the inner diameter surface of the notch and an inner diameter equal to the diameter of the inner circumferential surface of the inner cylinder, and have the same cross-sectional area or the same cross-sectional area as the lubricating groove of the inner cylinder on the inner peripheral surface. On the outer circumferential side of the rubber ring, in which lubricating grooves with a larger cross-sectional area are formed at the same pitch, a metal or synthetic resin ring with the same outer diameter as the rubber ring is attached from at least one axial end. An underwater rubber bearing characterized in that a composite ring is press-fitted with a bonded composite ring located on the inside in the axial direction.