JP2003056579A - Sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combined sealing device for permitting sealing between the rotating portion and the mounting portion of a bearing. SOLUTION: The sealing device comprises an outer-ring side sealing element 4 and an inner-ring side sealing element 5. The outer periphery edge of the outer-ring side sealing element 4 is provided with a protruded lip 4a protruded to the outer periphery side, and the protruded lip 4a is held in a gap b between an outer ring 1 and an outer ring mounting member 3. Thus, the bearing can be sealed and the gap b between the outer ring 1 and the outer-ring mounting portion 3 can also be sealed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing for a vehicle wheel and a sealing device for sealing the bearing.
The present invention relates to a sealing device having a plurality of sealing elements arranged by combining a plurality of sealing elements.

[0002]

2. Description of the Related Art An automobile wheel is rotatably supported by a suspension device by a rolling bearing or the like. When mounting this bearing, an outer ring mounting member for fitting and fixing the bearing from the outer peripheral side is mounted. It has a structure in which a slight gap is left circumferentially to improve the accuracy. As a sealing device for sealing the bearing of such an axle mounting portion, a combination seal composed of two sealing elements, which are respectively attached to the inner ring and the outer ring of the bearing to form a pair, is often used. With respect to the seal, a high sealing performance is obtained by bringing a seal lip formed on one of the seal elements into contact with and slidingly contacting the opposing seal element. In recent years, there are many combination seals in which one seal element is provided with a plurality of seal lips made of an elastic body, and the other seal element is a slinger having a shape wrapping the seal lip. Further, some of the combination seals are also provided with a magnetic encoder for generating a pulse for detecting the rotation speed of the wheel.

[0003]

However, as described above with reference to the drawings, such a bearing has an outer ring for fixing the outer ring (1) to the outside of the outer ring (1) as shown in FIG. A mounting member (3) is arranged, and a structure in which a slight gap (b) usually remains between the outer ring (1) of the bearing and the outer ring mounting member (3) is left in order to improve the mounting accuracy. It can be said that this gap (b) is in an environment in which moisture that intrudes from the outside can be accumulated and is extremely susceptible to rusting. If rusting occurs here, the outer ring mounting member (3), the outer ring (1), or worse This will affect the mounting flange and make disassembly during maintenance difficult.

Further, when the above-mentioned magnetic encoder (5a) and the like are arranged in the vicinity of this gap (b), if rust occurs in the above-mentioned gap (b), it is scattered on the magnetic encoder (5a) and immediately. There is a risk of degrading the rotation detection function. SUMMARY OF THE INVENTION The present invention has been made in view of such a serious drawback, and an object of the present invention is to provide a seal device for sealing a rotating portion and a mounting portion of a bearing.

[0005]

The present invention will be described with reference to the drawings. As shown in FIG. 1, outer ring side seal elements (4) mounted on the outer ring (1) and the inner ring (2) of a bearing, respectively. A sealing device comprising a combination of two members, an inner ring side sealing element (5) and an outer ring side sealing element (5), which is made of an elastic body and has an intermediate curved portion to the outer peripheral edge of the outer ring side sealing element (4). When the outer ring (1) of the bearing is fitted with the outer ring mounting member (3) after the lip (4a) is formed and the seal device is mounted on the bearing, the protruding lip (4a) is a side end surface of the outer ring (1). The outer ring mounting member (3) and the end surface of the outer ring mounting member (3) are sandwiched in a gap (b).

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION According to the sealing device of the present invention configured as described above, the sealing device is provided by providing the protruding lip (4a) on the outer peripheral edge of the outer ring side sealing element (4) on one side. When mounted on the bearing, the protruding lip (4a) is inserted into the gap (b) between the side end surface of the outer ring (1) and the end surface of the outer ring attachment member (3), and is thus inserted into the gap (b). The projecting lip (4a) comes into close contact with the convex part or the tip part of the curved part on the both end faces at a proper pressure without being affected by the size of the gap, so that a good sealing action is obtained from the initial contact state. It will be something to show.

As described above, the projecting lip (4a) has a large allowable size for compressive deformation due to its bent shape. Here, even if the above-mentioned variation in the size of the gap (b) occurs due to the processing accuracy of the bearing, it is possible to obtain this. Absorbing and stable sealing performance can be expected.

[0008]

EXAMPLES To carry out the present invention, when mounting the sealing device, the outer ring side and inner ring side sealing elements (4) and (5) are press-fitted into the inner ring and the outer ring (1) and (2), respectively, and then the outer ring. When the outer ring mounting member (3) is press-fitted from the side toward the bearing, the protruding lip (4a) projecting to the outer peripheral side of the outer ring side sealing element (4) and the end surface of the outer ring side sealing element (4),
It will be sandwiched between the outer ring mounting member (3) and the end surface,
Initially, the outermost portion of the projecting lip (4a), for example, the top of the bent portion or the tip of the lip comes into contact with the respective end faces, and when further compressed, the bent portion is deformed while extending the bend. Allow it to be compressed until it is fully extended.

The bent shape of the protruding lip (4a) here is required to be bent at a flat portion on both end faces, and is limited to a dogleg shape as shown in FIG. For example, a zigzag bent shape or a meandering shape with a curved line (both not shown) can be implemented, and it may be dealt with according to the required performance.

In the formation of the protruding lip (4a), the plurality of lips formed inside the outer ring-side sealing element (4) are made of an elastic material such as a synthetic rubber material, and the bent shape thereof. In addition, the protrusion size, the thickness, and the like are adjusted and determined according to the variation and depth of the gap (b) between the outer ring (1) and the end face of the outer ring mounting member (3).

[0011]

According to the present invention, the bearing is hermetically sealed by the combination of the outer ring side sealing element (4) and the inner ring side sealing element (5), and the gap (b) between the outer ring (1) and the outer ring mounting member (3). In (), it is closed by the protruding lip (4a) formed on the outer ring side sealing element (4), and here, the action of absorbing the variation in the size of the gap (b) is also shown. Further, the magnetic encoder (5a) provided on the outer radial direction portion of the inner ring side sealing element (5) and a sensor (not shown) for detecting the magnetic encoder (5) have a sensing space in the outer ring (1) and the outer ring mounting member (3). When it is arranged near the gap (b), the existence of the protruding lip (4a) that closes the gap (b) and completely protects the sensing space becomes significant.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a conventional structure not using the present invention.

[Explanation of symbols]

1 outer ring 2 inner ring 3 Outer ring mounting member 4 Outer ring side sealing element 4a protruding lip 5 Inner ring side sealing element 6 sensors b gap

Claims (2)

[Claims] 1. A sealing device comprising a combination of an outer ring-side sealing element and an inner ring-side sealing element, which are mounted on an outer ring and an inner ring of a bearing, respectively, and has an intermediate curved portion at an outer peripheral edge of the outer ring side sealing element and an outer peripheral side. A protruding lip protruding from the outer ring is formed in the gap between the side end surface of the outer ring and the end surface of the outer ring mounting member for mounting the outer ring when the seal device is mounted on the bearing. And seal device. 2. The sealing device according to claim 1, wherein the protruding lip has a shape bent into a dogleg shape.