JPH0252140B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seal disposed between two members that rotate relative to each other, particularly two members where one is rotatable and the other is fixed, such as the inner and outer rings of a rolling bearing. The present invention relates to a device assembly, particularly a sealing device assembly having at least three seals.

Conventionally, in mechanical equipment, in order to prevent lubricant from leaking from the equipment or dust or external contaminants from entering the equipment, a method is used in which the equipment is successively separated into sealed chambers. Various sealing structures are known of the type that provide a positive seal between mutually rotating members, such as between a rotating shaft and a housing containing its associated bearing, or between rings of individual rolling bearings.

In an example of the prior art (Japanese Unexamined Patent Publication No. 57-103930) based on this perspective, as shown in FIG. It is interposed between this and a seat 3 coaxially formed on the housing 4. The sealing assembly 1 (FIG. 1) consists of a sealing ring 5 and a rigid shielding member 6 fixed to the shaft 2.
The sealing ring 5 has an annular support member 7 made of metal or other rigid high resistance material.
A sealing member 8 made of a flexible and elastically deformable material is fixed to this support member 7.

The cross section of the support member 7 is L-shaped, and the first portion 9
are parallel to the axis of the shaft, and the second portion 10 is perpendicular to the other and extends radially to the axis of the shaft. On the other hand, the sealing member 8 is part 1 of the member 7.
It includes a substantially flat portion 11 parallel to 0. Extending from this portion 11 are two annular lips, the first of which is substantially parallel to the axis of the shaft 2 and inclined at a predetermined small angle away from the axis of the sealing member itself. It is extended in a state of The second annular lip 13, on the other hand, emanates from the root of the first lip 12 of the portion 11 and extends in a direction substantially perpendicular to the axis of the sealing member itself, with a predetermined slight inclination. The ends 14 and 15 of the two lips 12 and 13 are adapted to slide over surfaces 20 and 21 of the shielding member 6, respectively. The shielding member 6 is composed of a sleeve portion 22 of a suitable thickness and a flange portion 23 perpendicular to the sleeve portion. The support member 7 can be fixedly fitted into a seat 3 formed in the housing 4 and its portion 9
It is coupled to the housing 4 at.

The seal assembly 1 operates as follows.

The sealing ring 5 is fixed by a portion 9 to a seat 3 formed on the housing 4. The rigid shielding member 6 is then mounted by being pushed along the axis 2 until the flange portion 23 is flush with the edge 16 of the portion 9. In this way, lips 12 and 13 are elastically deformed such that ends 14 and 15 respectively
surface 20 of the sleeve portion 22 and surface 21 of the sleeve portion 22.

The end 14 faces the external environment, while the end 15 faces the internal chamber 17 bounded by the seat 3 and the axis 2. Any lubricant that may leak from the annular chamber 17 encounters the annular lip 13, which slides against the surface 21 of the sleeve part 22 with a predetermined pressure. The end 15 of the lip 13 is connected to the inner chamber 1.
7, the stronger the extrusion force of the lubricant that is about to leak, the greater the sealing effect.

In contrast, external contaminants attempting to enter the chamber 17 encounter the annular lip 12 sliding in contact with the surface 20 of the flange portion 23 with a predetermined pressure. Since the end 14 of the lip 12 faces the external environment, in this case, the greater the increase in pressure exerted by the contaminant on the seal, the greater the contact pressure between the surface 20 and the lip 12 to create a seal. The effect increases.

The above-mentioned prior art is effective in preventing lubricant from leaking from inside a mechanical device to the outside and preventing external contaminants from entering the inside of the mechanical device. However, if contaminants such as muddy water adhere to the vicinity of the first annular lip 12 from the outside, the contaminants will be sandwiched between the lip 12 and the surface 20, causing wear of the lip 12 and promoting the intrusion of muddy water. The Rukoto. Also, Lip 12,
Since the lip is oriented in the above-mentioned direction, the annular chamber surrounded by the lip 13 and the shielding member 6 will have a negative pressure than the surroundings due to temperature changes, and the lip will be strongly pressed against the sliding surface, promoting wear of the lip. Become.

Further, since only two lips (lips 12 and 13) are provided, the sealing effect is insufficient both in terms of preventing lubricant leakage and preventing contaminants from entering.

The present invention has been made against this background, and aims to eliminate the drawbacks of the above-mentioned conventional example, that is, by slightly leaking lubricant,
The object of this invention is to provide a sealing device assembly whose sealing effect is not impaired by contaminants such as muddy water entering from outside the mechanical device.

To achieve the above object, the present invention seals a space 70 formed between a radially outer member 50 and an inner member 55 that are concentrically and radially spaced apart and are rotatable relative to each other. a first radial member 30 extending from the outer member toward the outer periphery of the inner member;
and located axially outwardly of the first radial member;
a second radial member 40 extending radially outward from the inner member toward the outer member and facing the first radial member; and a second radial member 40 disposed between the distal end of the first radial member and the inner member. Ritsubu 36,
40; an end seal 64 having a lip 46 extending axially inwardly from the second radial member to a side of the first radial member; A second radial seal portion 62 having a lip 48 extending radially outward from the direction member to the outer member is arranged in this order from the space side on a path from the space to the outside world, and The tips of the lips of the first and second radial seal parts and the end face seal part are both formed in the same direction as the path from the space to the outside world so as to allow the lubricant in the first space to leak to the outside world. That's what I did.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in more detail based on the drawings.

As shown in FIGS. 2a and 2b, the sealing device assembly includes a first annular element 30 having a first sealing member 34 secured to a first support member 32, and a second sealing member 44 secured to a second support member 42. and a second annular element 40 to which is fixedly attached. The first support member 32 is made of a suitable metal and has an axially extending first portion 32a.
and a second portion 32b extending in a direction perpendicular to this. A first sealing member 34 made of rubber or the like and provided with a lip 36 is disposed on the inner peripheral side of the second portion 32b.
is installed. On the other hand, the second support member 42
Similarly, it has a first portion 42a extending in the axial direction and a second portion 42b extending perpendicularly thereto. A second lip 46, 48 made of rubber or the like is provided on the outer circumferential side of the second portion 42b.
A sealing member 44 is mounted outwardly.

When installing the seal assembly to the bearing,
As shown in FIG. 3, the first annular element 30 is inserted into the seat 54 until it abuts the step 52 of the outer ring 50 of the bearing, and then the second annular element 40 abuts the step 56 of the inner ring 55 of the bearing. Insert it all the way into the seat 58. Outer ring 5
0 and the inner ring 55 are concentrically spaced apart in the radial direction of the bearing and rotate relative to each other. When inserting the second annular element 40, the lip 36 comes into contact with the inner peripheral surface of the first portion 42a and due to its shape, is elastically deformed in the direction opposite to the insertion direction (to the right in FIG. 3). The first radial seal portion 60 extends radially inward and axially outward of the bearing. The lip 48 also contacts the inner circumferential surface of the first portion 32a and is elastically deformed in the same direction, forming a second radial seal portion 62 that faces outward in the radial direction of the bearing and faces outward in the axial direction. Note that the lip 46 is inserted into the second portion 32 at the final stage of insertion.
b, and is elastically deformed radially outward (upward in FIG. 3) to form an end face seal portion 64 that faces radially outward and axially inward of the bearing. The second portion 32b of the first annular element 30 is the second annular element 40
and extends radially inwardly toward a first portion 42 a of the second annular element 40 .
b is located outside the second portion 32b of the first annular element 30 in the axial direction and parallel to the second portion 32b of the first annular element 30;
0 and extends radially outward toward the first portion 32a.

The operation of the sealing device assembly attached to a mechanical device (for example, between the inner and outer rings of a rolling bearing) as described above will be described next. Inner ring 55 and outer ring 5
The lubricant in the internal chamber 70 formed between Each seal portion allows lubricant to leak to the outside. That is, each lip 3 is
This is because 6, 46 and 48 are elastically deformed in the forward direction.

On the other hand, the fact that the lips 36, 46, and 48 are oriented in the above direction means that the direction is opposite to the intrusion direction of muddy water, etc. that tries to enter the chamber 70 from the outside 72 (the direction opposite to the above-mentioned dashed line). This effectively prevents muddy water from entering. The muddy water is considerably purified by passing through the second radial seal section 62, and most of the mud, sand, etc. are removed when it passes through the end face seal section 64. Moreover, since the lubricant leaks from both the radial seals 60 and 62 as well as the end face seal 64, the surface of the first support member 32 may be damaged by sand or the like that has accumulated in these parts. Less is.

Next, a second embodiment of the present invention will be described with reference to FIG. 4, but for the sake of simplicity, parts corresponding to those in the above embodiment are indicated by the same reference numerals, and detailed explanation will be omitted. This embodiment differs from the above embodiments in that the axial widths of both annular elements 30 and 40 are narrowed to make the entire structure more compact. To this end, the lip 48 of the second sealing member 44 of the second annular element 40 is relatively long and extends axially outward of the bearing (to the right in FIG. 4). and,
The lip 48 is connected to the support member 3 of the second annular element 30.
2, but is directly in contact with a seat 54 formed on the inner circumferential surface of the outer ring 50.

Further, third portions 32c, 42c that are slightly inclined inward are provided continuously to the second portions 32b, 42b of the first and second support members 32, 42, and the sealing members 34, 42 are provided in the third portions. is firmly attached.

In the above two embodiments, the three lips 36, 46 and 48 were formed separately, such as one or two, on the first or second annular element 30, 40. That is not essential. The fifth example is another third embodiment.
As shown in the figure, the support member 4 of the second annular element 40
2, in addition to the sealing member 44, another lip 49 is provided.
The support member 3 of the first annular element 30 is fixed and brought into contact with the inner peripheral side of the right-angled bent portion 32d of the support member 32.
2 may not be provided with a sealing member. Note that the first portion 42 of the second support member 42
It goes without saying that the lip 49 fixed to a is formed so as to be in the forward direction with respect to the direction in which the lubricant leaks.

It should be noted that various types of mechanical devices to be sealed can be considered in addition to bearings, and the present invention can be widely applied to these devices.

As described in detail above, according to the present invention, the sealing device assembly has at least two radial seal parts and at least one end face seal part, and each of these three seal parts can be connected from the inside of the mechanical device to the outside. It is formed to move towards. In other words, since a small amount of internal lubricant can leak to the outside, each of the above seals will be lubricated by the leaked lubricant, and the seals will be damaged by external contaminants. This has the effect of eliminating the possibility of being exposed.

[Brief explanation of the drawing]

FIG. 1 is an assembled sectional view showing one of the conventional examples. FIGS. 2a and 2b are exploded sectional views showing the first embodiment of the present invention, and FIG. 3 is an assembled sectional view. FIGS. 4 and 5 are assembled sectional views showing second and third embodiments of the present invention, respectively. [Explanation of symbols of main parts], 30, 40... annular element, 32, 42... support member, 34, 44...
...Sealing member, 36, 46, 48... Lip, 6
0, 62... Radial seal portion, 64... End face seal portion.

Claims (1)

[Scope of Claims] 1. A sealing device assembly for sealing a space formed between a radially outer member and an inner member that are concentrically and radially spaced apart and are rotatable relative to each other; a first radial member extending from the outer member toward an outer peripheral edge of the inner member; and a first radial member located axially outwardly of the first radial member and extending radially outwardly from the inner member toward the outer member. a second radial member extending and opposing the first radial member; a first radial seal portion having a rib disposed between a distal end of the first radial member and an inner member; an end face seal having a lip extending axially inwardly from the second radial member to a side surface of the first radial member; and an end seal portion having a lip extending axially inwardly from the second radial member to the outer member. a second radial seal portion having a lip; the first radial seal portion, the end face seal portion, and the second radial seal portion are arranged in this order from the space side on a path from the space to the outside world; Further, the tips of the lips of the first and second radial seal portions and the end seal portion are each formed of:
In order to allow the lubricant in the space to leak to the outside world, the lip is curved in the same direction as the path from the space to the outside world, and the leaking lubricant causes the tip of the lip to contact the other contact surface of the tip. A sealing device assembly characterized in that the sealing device assembly is adapted to lubricate between.