JP4262365B2 - Sealing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sealing device divided into two parts, and relates to a joining technique of mating surfaces.
[0002]
[Prior art]
Conventional assembly of oil seals (sealing devices) that have a general annular shape without a cut part is performed by passing the shaft after the oil seal is assembled into the shaft hole of the housing, or after passing the shaft through the shaft hole of the housing. This is done by fitting an oil seal into the annular gap between the shaft and the shaft.
[0003]
However, for example, as shown in FIG. 5, when sealing water from the stern tube 102 of the ship through which the shaft 101 connecting the screw is inserted, a grease box 103 is provided inside the stern tube 102 and the shaft 101 is provided. Is inserted into the grease box 103 and led to the engine side (right side in the figure).
[0004]
In such a case, it is difficult to install the annular oil seal as it is (it is necessary to divide the shaft), so the stern tube and the gap between the grease box and the shaft are divided into two types of oil seals. 105 (105a, 105b: sealing device) is provided, and the oil seal 110 can be replaced without removing the shaft 101.
[0005]
In recent years, the split-type oil seal is not only a circular, rectangular, or elliptical cross-section, but also an integral structure with a rubber-like elastic body that has a seal lip with the outer peripheral surface of the shaft as a sliding surface. Therefore, the seal lip needs to be provided with an appropriate interference allowance, and is compressed and deformed in the shaft hole of the housing to which the seal lip is attached.
[0006]
[Problems to be solved by the invention]
However, in the case of the conventional split-type oil seal, when it is necessary to attach it to the shaft hole of the housing in an annular state by compressive deformation (if one is installed, the side to be installed later is greatly compressed and deformed. Therefore, it is difficult to carry out the mounting operation), so that it cannot be held in an annular shape, and improvement in workability has been desired.
[0007]
In addition, misalignment of the butting surfaces is likely to occur, it is difficult to match the lip lines of the respective seal lips, and there is a concern that the sealing performance will be lowered.
[0008]
The present invention solves the above-mentioned problems of the prior art, and the object of the present invention is to improve the mounting workability and to suppress the positional deviation of the butting surfaces and to match the lip line of the seal lip. An object of the present invention is to provide a sealing device that enables this.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, magnetic adsorption means for magnetically adsorbing each other in an annular sealing device that is divided into at least two parts in the circumferential direction and combined so that the respective divided surfaces are in contact with each other. The sealing device is formed of an elastic material capable of being magnetized, and is magnetized so that the divided surfaces facing each other are magnetically attracted to each other.
[0010]
Thereby, the mounting workability | operativity of a sealing device can be improved by mutually attracting | sucking the division | segmentation surface which the contact | abutting contact of the divided sealing device opposes mutually.
[0011]
That is, since the dividing surface is magnetically attracted, it can be handled in the same way as one annular sealing device, and the fall of the portion located on the lower side and the displacement of the dividing surface are suppressed.
[0012]
In many cases, the housing and the shaft to which the sealing device is attached are made of iron or the like, so that the sealing device can be temporarily fixed to the housing or the shaft or the like, and the efficiency of the assembly work can be improved.
[0013]
It is also preferable to provide a seal lip that comes into contact with the fitting portion mounted in the shaft hole of the housing and the sliding surface of the shaft.
[0014]
Thereby, it becomes possible to improve sealing performance. Further, since the divided surfaces are magnetically attracted and positioned, it is possible to prevent the lip line of the seal lip from shifting.
[0015]
The sealing device is formed of a resilient member of the magnetized, it is preferable that the dividing plane which said opposing abutment are magnetized so that magnetic attraction to each other.
[0016]
The sealing device can be formed by integral molding of so-called plastic magnets or rubber magnets, and can have a simple configuration.
[0017]
It is also preferable that a concave-convex fitting portion is formed on a divided surface where the fitting portions face each other.
[0018]
By the concave / convex fitting portion, the divided surfaces that face each other are more reliably positioned. The concave-convex fitting portion may be a combination of a spherical bulge and a dent, but a pyramid having a plurality of slopes or a truncated pyramid shape can also be applied to prevent twisting.
[0019]
In addition, it is possible to adopt a form in which the concave-convex fitting portion is cut non-linearly from the side end surface or outer peripheral surface of the sealing device, and in addition to the manufacturing method of manufacturing the divided surface by molding, it is formed in an annular shape. It is also possible to adopt a manufacturing method in which the sealing device is cut in the circumferential direction by cutting the sealing device, and can be manufactured easily.
[0020]
It is also preferable that the magnetic attraction means is an uneven fitting member that is disposed in the fitting portion and magnetically attracts each other.
[0021]
By providing the concavo-convex fitting members that magnetically attract each other, it is possible to position and attract the divided surfaces that face each other without changing the material of the main body of the sealing device.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
FIG. 1 is a diagram for explaining a sealing device 1 according to a first embodiment. FIG. 1 (a) is a state of being divided into two parts before mounting, and FIG. 1 (b) is an end view of a divided surface (FIG. 1). 1 (a) is a V1-V1 arrow view), and FIG. 1 (c) is a diagram illustrating a state in which the divided surfaces are combined into an annular shape.
[0023]
The sealing device 1 has a configuration in which the first portion 2 and the second portion 3 are divided into two in the circumferential direction, and the divided surfaces 2a and 2b and the divided surfaces 3a and 3b are combined so as to face each other. As shown in FIG. 1B, the annular gap 12 between the shaft hole 10 a of the housing 10 and the outer peripheral sliding surface 11 a of the shaft 11 inserted through the housing 10 is formed. It is attached to and used.
[0024]
As shown in FIG. 1 (b), the cross-sectional configuration of the sealing device 1 is a fitting portion 4 having a substantially rectangular cross section that fits into the shaft hole 10 a of the housing 10. The seal lips 6a and 6b are formed so as to be inclined on both sides in the axial direction through a radial portion 5 extending in the direction of the axis.
[0025]
The sealing device 1 is formed of a rubber magnet in which magnetic particles are mixed in a so-called rubber-like elastic body so that the divided surfaces 2b and 3a become S poles so that the divided surfaces 2a and 3b become N poles. Are magnetically attracted to each other.
[0026]
In the sealing device 1 configured as described above, the divided surfaces 2a and 2b and the divided surfaces 3a and 3b, which are opposed to each other, of the divided portions (first portion 2 and second portion 3) of the two-divided sealing device 1 are connected to each other. The attachment workability | operativity of the sealing device 1 can be improved by making it magnetically attract.
[0027]
That is, since each divided surface is magnetically attracted, the sealing device 1 can be handled in the same manner as one annular sealing device, and the fall of the portion located below and the positional deviation between the divided surfaces are suppressed. .
[0028]
Further, the housing 10 and the shaft 11 to which the sealing device 1 is attached are often made of a magnetic material such as iron, and it is possible to temporarily fix the sealing device 1 to the housing 10 and the shaft 11 or the like by a magnetic attraction force. As a result, the efficiency of the assembly work can be improved.
[0029]
Further, since each divided surface is magnetically attracted and positioned, it is possible to prevent the lip line from being shifted between the seal lips 6a and 6b on each divided surface.
[0030]
The split surface is composed of a surface orthogonal to the circumferential direction (straight cut), but it can also be an inclined surface (bias cut) or a wavy or stepwise split surface (step cut). Is possible.
[0031]
Although the sealing device 1 is divided into two in this embodiment, it can be divided into two or more divisions (for example, three divisions). Moreover, it is also possible to provide a magnetic attracting means for the divided surface with respect to the seal ring having no seal lip and having a circular or rectangular cross section.
[0032]
(Embodiment 2)
FIG. 2 is a diagram for explaining a sealing device 21 according to the second embodiment. As a feature of this embodiment, a concave / convex fitting portion 27 is formed on the split surface 22a and the split surface 23a that face each other of the split portions 22 and 23 of the split device 21 divided into two. Other parts are the same as those in the first embodiment.
[0033]
The concave-convex fitting portion 27 includes a quadrangular frustum-shaped projection 22c protruding from the dividing surface 22a and a concave portion 23c formed in the dividing surface 23a into which the projection 22c is fitted, and the opposite dividing surface (not shown). ) Has the same configuration.
[0034]
In addition to the operation and effect of the first embodiment, the concave / convex fitting portion 27 more reliably positions the divided surfaces that face each other. In particular, it is possible to further improve the sealing performance by further preventing the lip lines of the seal lips 6a and 6b from being shifted on each divided surface.
[0035]
The concave-convex fitting portion 27 can be applied with a pyramid having a plurality of slopes or a truncated pyramid shape (in this embodiment, a quadrangular pyramid) in order to prevent twisting, but is simply a combination of a spherical rise and a depression. Alternatively, a combination of a cylindrical shape and a circular recess may be used, and the shape is not limited.
[0036]
Moreover, the uneven | corrugated fitting part 27 can be applied also to an inclined surface, a wavy, and step-shaped division surface.
[0037]
( Reference Example 1 ) FIG. 3 is a cross-sectional configuration explanatory view illustrating a sealing device 31 in Reference Example 1 . As a feature of this embodiment, a metal made of a magnetized material, which is a convex and concave fitting member that magnetically attracts to the divided surface 32a and the divided surface 33a of the divided parts 32 and 33 of the divided device 32 divided into two in contact with each other. A cup 38 and a magnetized stud 39 are embedded.
[0038]
By fitting the metal cup 38 and the stud 39, they are magnetically attracted and are positioned relative to each other.
[0039]
A hole 39a is provided on the embedding side of the stud 39, and the fabric flows into the hole 39a when being integrally formed with the divided portion 33, so that stronger bonding is achieved.
[0040]
By providing the concave and convex fitting members that magnetically adsorb to each other in this way, positioning and adsorption of the opposed surfaces that face each other without changing the material of the main body of the sealing device 31 (a normal rubber-like elastic body can be used). Can be performed.
[0041]
( Embodiment 3 ) FIG. 4 is a view for explaining the form of the concave-convex fitting portion of the dividing surface of the sealing device in the third embodiment .
[0042]
4 (a), 4 (b), and 4 (c) show the divided surfaces 41, 42, and 43 by cutting each side surface of the sealing device in the axial direction with a wavy, mountain-shaped, and trapezoidal non-linear cutter. Forming.
[0043]
Thus, it is also possible to employ a manufacturing method in which the sealing device formed in an annular shape is cut in the circumferential direction by cutting, and can be manufactured more easily than a manufacturing method in which the divided surface is manufactured by molding.
[0044]
In addition, in order to further reduce the prevention of axial lip line displacement, as shown in FIGS. 4D, 4E, and 4F, a wave shape, a mountain shape, It is also possible to form the split surfaces 44, 45, 46 by cutting in the axial direction with a trapezoidal non-linear cutter.
[0045]
【The invention's effect】
As described above, according to the sealing device to which the present invention is applied, the mounting workability of the sealing device can be enhanced by magnetically adsorbing the divided surfaces of the divided sealing devices that abut against each other.
[0046]
That is, since the dividing surface is magnetically attracted, it can be handled in the same way as one annular sealing device, and the fall of the portion located on the lower side and the displacement of the dividing surface are suppressed.
[0047]
In many cases, the housing and the shaft to which the sealing device is attached are made of iron or the like, so that the sealing device can be temporarily fixed to the housing or the shaft, and the efficiency of the assembly work can be improved.
[0048]
By providing the seal lip, the sealing performance can be improved. Further, since the divided surfaces are magnetically attracted and positioned, it is possible to prevent the lip line of the seal lip from shifting.
[0049]
The sealing device can be formed by integral molding of an elastic body using a so-called plastic magnet or rubber magnet, and has a simple configuration.
[0050]
Positioning of the divided surfaces that face each other is more reliably performed by the concave and convex fitting portions of the divided surfaces that face each other.
[0051]
By providing the divided surfaces with the concave and convex fitting members that magnetically adsorb each other, it is possible to perform positioning and adsorption of the divided surfaces that face each other without changing the material of the main body of the sealing device.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a sealing device according to a first embodiment.
FIG. 2 is an explanatory view of a waist configuration of a sealing device according to a second embodiment.
FIG. 3 is an explanatory diagram of a waist configuration of a sealing device according to a form of Reference Example 1 ;
FIG. 4 is an explanatory view of a waist configuration of a sealing device according to a third embodiment .
FIG. 5 is a schematic diagram for explaining a situation in which a conventional sealing device is used.

Claims (3)

In the sealing device which is divided into at least two in the circumferential direction and is combined so that the respective divided surfaces come into abutment with each other in an annular shape
The split surfaces that face each other are provided with magnetic attracting means for magnetically attracting each other ,
The sealing device is formed of an elastic body capable of being magnetized, and is magnetized so as to magnetically attract the divided surfaces that face each other.   The sealing device according to claim 1, further comprising a fitting lip attached to the shaft hole of the housing and a seal lip that contacts the sliding surface of the shaft. 3. The sealing device according to claim 1, wherein an uneven fitting portion is formed on a divided surface of the fitting portion that abuts against each other.

Images