JP2003042303A - Sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device capable of smoothly and relatively sliding an outer ring element to an axle, and finely scratching and removing foreign matter adhered to an axle surface. SOLUTION: This sealing device divides an annular space 6 formed between a axle 2 and an outer ring element 3 concentrically disposed so as to be relatively displaced in an axial direction, into an exterior space side and a sealed space side. The sealing device is composed of an oil seal 7 attached to the outer ring element 3 and having a flexible lip contacting with an outer peripheral surface of the axle, and a dust seal 8 disposed in the exterior space side rather than the oil seal 7 and having non-flexible lip contacting with the outer peripheral surface of the axle. The dust seal 8 is held in a state accepting movement in a radial direction and an axial direction to the oil seal 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device for a railway vehicle, in particular, an annular space formed between an axle and an outer annulus concentrically arranged so as to be relatively displaceable in the axial direction. The present invention relates to a sealing device that partitions a space side and a sealed space side.

[0002]

2. Description of the Related Art A railroad vehicle is known in which wheels are fixed to the axle of the railroad vehicle and the distance between the left and right wheels can be changed so as to accommodate different track intervals.

Therefore, the axle is rotatably supported by the vehicle body, and the wheel, which is an example of an outer ring body externally fitted to the axle, can be relatively moved in the axial direction, that is, the vehicle width direction. Therefore, the wheel is configured to be slidably fitted on the axle in the vehicle width direction.

It has been proposed that the axle integrated with the wheel is movable in the axial direction with respect to the vehicle body side support structure (in this case, this support structure corresponds to the outer ring body).

[0005]

By the way, in the case of the conventional structure, the wheel fitted to the axle so as to be slidable in the axial direction, and the fitting member fitted in the annular space between the wheel and the axle. A flexible lip is integrally provided to form a sealing device between the axle and the wheels.

In this sealing device, the flexible lip slides the inner diameter side edge of the lip with respect to the outer peripheral surface of the axle to prevent dust and the like from entering the annular space side from the outside. It was

However, in the conventional case, since the flexible lip is integral with the fitting member, when the outer ring member is slid relative to the axle, the lip is frictionally generated with the axle. There was a risk of turning over, and there was a risk of dust, water, etc. entering the sealed space from the turned-up location.

Further, with the elastic lip, when changing the wheel position in the axial direction, it is not possible to sufficiently scrape and remove mud or snow adhering to the axle, which may result in poor sealing.

The present invention has been made in view of the above circumstances, and enables the outer ring member to be smoothly slid relative to the axle and the foreign matter on the axle surface can be scraped off. It is an issue to be solved to provide a sealing device that can perform well.

[0010]

According to a first aspect of the present invention, there is provided a sealing device, which has an annular shape formed between an axle and an outer ring body which are concentrically arranged so as to be relatively displaceable in the axial direction. A sealing device for partitioning a space into an external space side and a sealed space side, the oil seal having a flexible lip attached to the outer ring body and in contact with an outer peripheral surface of an axle, and the oil seal A structure in which a dust seal that is arranged on the external space side and that has a non-flexible lip that contacts the outer peripheral surface of the axle is combined, and the dust seal moves in a radial direction and an axial direction with respect to the oil seal. It is characterized in that it is held in a floating state that allows

According to the structure of claim 1 of the present invention, since the dust seal is held in a floating state that allows the oil seal to move in the radial direction and the axial direction, the axial direction, the radial direction, and the circumferential direction. When the axle and the outer member are slid relative to each other in the axial direction, the mud and snow on the outer peripheral surface of the axle are scraped off by the non-flexible lip. Even if some friction or resistance acts on the non-flexible lip during scraping, the dust seal changes to a posture in which the scraping force works more strongly or is positioned on the oil seal side even if some friction or resistance acts on it. Since it is supported so as to be regulated, this dust seal itself does not deform like turning up,
It will be scraped well.

Further, the sealing device according to the present invention is defined in claim 2.
The oil seal according to claim 1, wherein the oil seal has a cylindrical portion fitted to the inner peripheral surface of the outer ring body and an end portion on the outer space side of the cylindrical portion in the radial direction. A metal ring having a brim portion connected so as to extend inward, a cylindrical portion fitted to the inner circumference of the cylindrical portion of the metal ring, and a end portion of the cylindrical portion on the sealed space side that extends inward in the radial direction. A configuration in which an annular core metal having an annular plate portion on which the flexible lip is attached is provided is provided in combination with the annular core metal and the annular space surrounded by the metal core. It is characterized in that the dust seal is fitted in the radial direction and the axial direction through a predetermined play.

According to the structure of claim 2 of the present invention, the dust seal is used in the radial direction and the axial direction by utilizing the oil seal having the structure in which the metal ring and the annular core metal to which the flexible lip is attached are combined. Since the dust seal is inserted through a predetermined play, the structure is simple, and the dust seal can firmly hold the mud or the like adhering to the axle, so that the scrap can be satisfactorily scraped.

Further, the sealing device according to the present invention is defined in claim 3.
As described in claim 1, in the oil seal according to claim 1 or 2, the flexible lip of the oil seal includes an outer lip and an inner lip that are arranged side by side in the axial direction, and the outer lip is on the outer space side. The inner lip is inclined toward the sealed space, and the contact portion of the inner lip is rounded.

According to the third aspect of the present invention, the outer lip and the inner lip of the oil seal can store a lubricant such as grease between the outer lip and the inner lip, and the outer lip has the above-mentioned structure. As with the dust seal, the surface of the axle is scraped off, and foreign matter adhering to the surface of the axle can be removed more satisfactorily. In addition, the inner lip has a rounded contact portion with the axle, which allows the lubricant to be well applied to the surface of the axle. Smooth sliding in the direction.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

1 and 2 relate to an example of an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view showing one half of a sealing device, FIG.
FIG. 3 is a cross-sectional view showing a wheel mounting portion for an axle of a railway vehicle, in which the upper half of the axle center position of the axle of FIG. 2 corresponds to a wide track, and the wheel is below the axle center position of the axle. Half shows the wheels adapted to a narrow track.

FIG. 2 shows a wheel mounting portion of a railway vehicle.

That is, the wheel 1 has a hub 3 as an outer ring body.
In addition to being integrally formed with the hub 3, the hub 3 is formed into a tubular shape and extends to the outside of the vehicle body from a portion integrally connected to the wheel 1 and has a predetermined length on the left and right sides.

The wheel 1 and the axle 2 are supported with respect to the vehicle body at a portion of the hub 3 that extends laterally outward from the wheel 1.

Near the outer end of the axle 2, the hub 3 and the axle 2 are spline-fitted so as to be slidable in the axial direction and integrally rotatable.

The connecting portion of the hub 3 on the vehicle inner side of the spline fitting portion with the wheel 1 has a columnar outer periphery which forms the circumferential surface of the cross section of the axle 2 even when the wheel 1 is moved to the outermost side of the vehicle. It is in a state of being fitted on the surface portion.

On the other hand, the gap between the vehicle inner side end of the hub 3 and the axle 2 is sealed by the sealing device 5 according to the present invention.

As shown in FIG. 1, the sealing device 5 is installed in an end face 3A of the hub 3 and an annular space 6 formed near the end face 3A at an inner peripheral surface facing the axle 2 side. The annular space 6 is partitioned into an external space side (in this case, the vehicle inner side of the annular space 6) and a sealed space side (in this case, the vehicle outer side of the annular space 6).

The sealing device 5 has an oil seal 7 press-fitted into the inner peripheral surface of the hub 3 in the annular space 6, and a floating state allowing the oil seal 7 to move in the radial direction and the axial direction. And the dust seal 8 provided in.

The oil seal 7 is fitted to the inner peripheral surface of the hub 3 by means of a metal ring 9 forming a fitting portion, an annular core metal 10 fitted to the metal ring 9, and an axle 2. The sealing member 12 is formed by vulcanizing and molding the flexible lip 11 that is in circumferential contact with the sealing member 12.

The metal ring 9 is formed by sheet metal working, and has a cylindrical portion 9a which is press-fitted into the inner peripheral surface of the hub 3 and a radial direction from one end portion of the cylindrical portion 9a in the axial direction. It is composed of a flange 9b as a flange portion extending inward.

The annular core metal 10 of the oil seal 7 is also a sheet metal processed, and the cylindrical portion 10a is press-fitted into the inner peripheral surface of the cylindrical portion 9a of the metal ring 9, and the axial direction of the cylindrical portion 10a. And a flange 10b as an annular plate portion extending inward in the radial direction from one end portion of the.

The flexible lip 11 is made of an elastic rubber such as nitrile rubber, is attached to the outer peripheral surface of the cylindrical portion 10a of the annular core metal 10 and the outer side surface of the flange 10b so as to form a thin film, and , A lip portion extending further inward in the radial direction from the inner peripheral end of the flange 10b.

As shown in FIG. 1, the tip of the lip portion is bifurcated in the axial direction, and the outer lip 13 in an oblique posture toward the external space side is set to have a large interference. In addition, the leading edge forms a sharp edge.

Of the two halves of the lip portion, the inner lip 1 is in an oblique posture toward the sealed space side.
In the case of No. 4, the shape of its tip edge is rounded to form a curved surface having a convex cross section.

Grease G, which is a lubricant, is stored in an annular space surrounded by both lips 13, 14 and the outer peripheral surface of the axle 2.

Further, the cylindrical portion 10a of the annular core metal 10 is
The metal ring 9 is integrated with the metal ring 9 by caulking one end of the cylinder part 9a in the axial direction while being press-fitted to the inner peripheral surface of the cylinder part 9a.

As shown in FIG. 1, the flange 9b and
The flange 10b constitutes a storage space 15 for storing the dust seal 8.

That is, the flange 9b and the flange 10b
Means that they are opposed to each other at an interval of the width of the cylindrical portion 10a in the axial direction, and that the flange 9
The housing space 15 surrounded by the b, the flange 10b, and the cylindrical portion 10a is formed.

In the storage space 15, as described above,
The dust seal 8 is stored in a floating state.

The dust seal 8 is made of a synthetic resin material such as polyamide resin or PTFE having a small friction coefficient with respect to the outer peripheral surface of the axle 2, and is inflexible.

The shape of the dust seal 8 is such that the main body 8a occupies most of the storage space 15 and the main body 8a.
The scraping portion 8b extends from the inside a in the radial direction and axially outside along the lip portion 13 and has a sharp edge 8c at its tip.

The axial width of the main body 8a is such that the flange 9b,
It is about 10% smaller than the distance between the flanges 10b, and the radial width of the dust seal 8, that is, the width from the sharp edge 8c position to the outer peripheral position of the main body portion 8a is the same as the outer peripheral surface of the axle 2 and the cylindrical portion 10b. It is set to be about 10% smaller than the interval.

Therefore, the dust seal 8 is attached to the flange 9
b, between the flanges 10b, and between the outer peripheral surface of the axle 2 and the cylindrical portion 10b, they are accommodated in a floating state that allows axial displacement and radial displacement, that is, they are inserted through play. ing.

Further, the scraping portion 8 is removed from the surface of the axle 2.
It is in a state having a interference part which partially overlaps b in the radial direction.

Therefore, as shown in the upper half of FIG.
As shown in the lower half of FIG. 2, from the state in which the wheel 1 is positioned on the outer side in conformity with the wide track, when the wheel 1 is positioned on the inner side in conformity with the narrow track, the wheel 1 and the hub 3 are
Is slid inward with respect to the axle 2. At that time, the dust seal 8 scrapes off the surface of the axle 2 with the sharp edge 8c in the sliding range.

When the scrape resistance against the adhered matter on the surface of the axle 2 is high, the dust seal 8 is attached to the flange 1.
The position will be regulated to 0b, and the scraping resistance will be countered by the scraping resistance. In addition,
Since the frictional resistance of the dust seal 8 to the axle 2 is small where there is no deposit on the surface of the axle 2, the wheels 1 and the like can be moved smoothly.

[0044]

As described above, according to the present invention, since the dust seal is held in a floating state which allows the oil seal to move in the radial direction and the axial direction, it is possible to prevent the dust seal from moving in the axial direction and the radial direction. It is not fixed in the circumferential direction, and in that state, sliding the axle and the outer member relatively in the axial direction scratches mud and snow on the outer peripheral surface of the axle with a non-flexible lip. Even if some friction or resistance acts on the non-flexible lip during scraping, the dust seal will change to a posture in which the scraping force works even more strongly or the oil seal side Since it is supported so as to be positionally controlled, this dust seal itself does not deform like turning up,
It will be scraped well.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing one half of a sealing device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an axle structure of a railway vehicle, in which an upper half portion of the axle center position is positioned on the outer side of the wheel, and a lower half portion of the axle center position indicates the wheel. Shows those located inward

[Explanation of symbols]

2 axles 3 hub (outer ring) 5 Sealing member 6 annular space 7 Oil seal 8 dust seal 9a cylindrical part 9b Flange (collar part) 10a cylindrical part 10b Flange (annular plate part) 13 outer lip 14 Inner lip

Claims (3)

[Claims] 1. A sealing device for partitioning an annular space formed between an axle and an outer annular body, which are concentrically arranged so as to be relatively displaceable in the axial direction, into an external space side and a sealed space side. An oil seal attached to the annulus and having a flexible lip that contacts the outer peripheral surface of the axle, and a non-flexible oil seal that is disposed on the outer space side of the oil seal and that contacts the outer peripheral surface of the axle. A sealing device having a structure in which a dust seal having a lip is combined, and the dust seal is held in a floating state that allows the oil seal to move in the radial direction and the axial direction. 2. The sealing device according to claim 1, wherein the oil seal has a diameter at a cylindrical portion fitted to an inner peripheral surface of the outer ring body and at an end portion of the cylindrical portion on an external space side. A metal ring having a collar portion connected so as to extend inward in the direction, a cylindrical portion fitted to the inner periphery of the cylindrical portion of the metal ring, and a radially inwardly extending end portion of the cylindrical portion on the sealed space side. It is a configuration in which an annular core metal having an annular plate portion to which the flexible lip is continuously attached is attached in an inner periphery is combined, and with respect to an annular space surrounded by the annular core metal and the metal ring. A sealing device, wherein the dust seal is fitted in a radial direction and an axial direction with a predetermined play. 3. The sealing device according to claim 1, wherein the flexible lip of the oil seal includes an outer lip and an inner lip that are arranged side by side in the axial direction, and the outer lip has an outer space. The sealing device is characterized in that the inner lip is in an oblique posture toward the side, the inner lip is in an oblique posture toward the sealed space side, and the contact portion of the inner lip is in a rounded shape.