JP2598208Y2 - Sealing device - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a slinger and a seal member.
And a sealing device that is a combination of the above. This sealing device
Is incorporated into, for example, wheel bearings for automobiles.
Used .

[0002]

Conventionally, as a tightly sealing apparatus of this type, FIG. 3
And the configuration shown in FIG. FIG. 3 is a cross-sectional view of the sealing device, and FIG. 4 is a cross-sectional view of a sealing member constituting the sealing device of FIG. 3 before a bearing is mounted.

[0003] This sealing device comprises an outer member A such as an outer ring,
Both members A, which are fitted between inner members B such as shafts and inner rings,
B, a sealer 1 attached to the outer member A and a slinger 2 attached to the inner member B
Is provided.

[0004] The seal member 1 is composed of a core 4 and an elastic body 6, and the core 4 is a cylindrical portion 4 a fitted inside the outer member A.
And an annular shape projecting radially inward from the cylindrical portion 4a
A plate portion 4b is formed. Further, the slinger 2 is formed with a tubular portion 2a fitted to the inside member B and an annular plate portion 2b projecting radially outward from the tubular portion 2a.

The elastic body 6 is fixed to the core 4 by baking synthetic rubber, synthetic resin, or the like.
Two radial lips 6b and 6c extend radially inward from a base 6a closely attached along the annular plate portion 4b from the inner peripheral surface side of the cylindrical portion 4a of the cored bar 4, and obliquely extend in the axial direction. Axial lips 6d are formed toward the respective sides. When the slinger 2 is fitted to the inner member B, the distal ends of the radial lips 6b and 6c abut on the cylindrical portion 2a, and the distal ends of the axial lip 6d abut on the annular plate portion 2b.

As described above, the sealing device combining the sealing member 1 and the slinger 2 has the radial lips 6b and 6c.
And the axial lip 6d are triple-sealed by contacting the slinger 2, so that there is an advantage that the sealing effect is high.

[0007]

By the way, in order to assemble the above-mentioned sealing device, the sealing member 1 and the slinger 2 are previously set integrally, and the set sealing device is inserted between the outer member A and the inner member B in advance. 2 and the cylindrical portion 4a of the metal core 4 of the seal member 1 are simultaneously inserted. At this time, the axial direction of the slinger 2 with respect to the seal member 1 is affected by various mechanical errors in the assembly process. May be slightly shifted back and forth. For example, in FIG. 3, the slinger 2 may be mounted at a position shown by a solid line or mounted at a position shown by a broken line.

When the slinger 2 is at the position shown by the solid line, the radial lips 6b, 6c
And the axial lip 6d is in contact with the slinger 2 at an appropriate pressure. On the other hand, when the slinger 2 is mounted at the position shown by the broken line in FIG. 3, the axial lip 6d is curved as shown by the broken line, and as a result, the axial lip 6d The pressure in contact with the annular plate 2b changes greatly. This is because, conventionally, the axial lip 6d is formed so that the thickness thereof gradually increases from the distal end portion to the proximal end portion.
This is because the elastic force increases proportionally as the degree of curvature of d increases. Moreover, axial lip 6
Along with the deformation of d, the radial lip 6c on the side adjacent thereto is also deformed as shown by a broken line, and as a result, the radial lip 6c does not come into contact with the cylindrical portion 2a of the slinger 2, or the contact pressure is insufficient. Becomes

As described above, in the conventional structure, the rotational torque of the inner member B changes due to the difference in the axial mounting position of the slinger 2 with respect to the seal member 1, and the sealing performance of the seal member 1 also changes. Problems such as instability have occurred.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is an object of the present invention to reduce the fluctuation of the contact pressure of an axial lip with a slinger even when the position of the slinger with respect to the seal member in the axial direction is different. In addition, the problem is to prevent the deformation of the axial lip from affecting the deformation of the radial lip, stabilize the rotational torque of the inner member, and always ensure sufficient sealing performance. I do.

[0011]

Means for Solving the Problems The present invention is directed to radially inward and outward.
Opposing annular space between the outer member and the inner member arranged concentrically
Sealing that is installed between and separates the opposed annular space in the axial direction
An apparatus, wherein the seal member is mounted on the outer member.
And a slinger mounted on the inner member.
A tube in which a finger is fixedly fitted to the outer peripheral surface of the inner member.
And the cylindrical part are integrally connected to the cylindrical part and radially outward.
An annular plate portion extending to the outside, wherein the sealing member is
A tubular portion fixedly fitted to the inner peripheral surface of the side member;
Annular plate integrally connected to the ridge and extending radially inward
And an annular plate of the slinger attached to the annular plate portion.
Axies made of elastic material that can be brought into axial contact with the
And the axial lip.
The root and tip are formed in a cylindrical shape with different diameters and almost concentric.
Respectively, and the distal end portion is
It is thinner than the tip and base so that it can be displaced in the
It is connected via a neck .

[0012]

In the above configuration, when the mounting position of the slinger with respect to the seal member in the axial direction deviates from a required specified position , the axial lip contacting the slinger is displaced.
The position in the axial direction of the distal end portion of the cylindrical shape is moved forward and backward by the elastic deformation of the neck portion . And then,
Since the neck of the axial lip is formed thinner than the tip and the base, the pressure at which the tip contacts the slinger is almost constant regardless of the magnitude of the elastic deformation of the neck, and the slinger is attached. This does not lead to fluctuations in the rotational torque of the inner member.

[0013]

DETAILED DESCRIPTION FIG. 1 is a sectional view of tight sealing device engaged Ru to an embodiment of the present invention, FIG. 2 is a sectional view showing a bearing state before attachment of the sealing member constituting the sealing device of FIG. 1, FIG. 3 Parts corresponding to the conventional example shown in FIG. 4 are denoted by the same reference numerals.

In FIGS. 1 and 2, reference symbol A denotes an outer member such as an outer ring of a bearing, and B denotes an inner member such as an inner ring of a bearing. 1 is a seal member attached to the outer member A, 2
Is a slinger, 2a and 2b are cylindrical portions and an annular plate portion forming a slinger, 4 is a core metal forming a sealing member 1, 4a, 4
“b” denotes a cylindrical portion and an annular plate portion that constitute the cored bar 4, and these configurations are the same as those of the conventional example.

The feature of the present invention is that the elastic body 6 is fixed to the metal core 4 by baking synthetic rubber or synthetic resin.
Configuration.

That is, the elastic body 6 is provided with two radial lips 6b extending radially inward from a base 6a closely attached along the annular plate portion 4b from the inner peripheral surface side of the cylindrical portion 4a of the metal core 4. , 6c and an axial lip 6d extending integrally in the axial direction. Then, the base portion above the axial lip 6d, the tip portion 6d ₁ that contacts the annular plate portion 2b of the slinger 2, the neck portion 6d ₂ of thinner than the distal end portion 6d _1, and wall thickness than the neck portion 6d ₂ is base portion 6d ₃ becomes are sequentially integrally formed leading to 6a, the distal end portion 6d ₁ and base portion 6 that sandwich the neck portion 6d ₂
The d _3, respectively formed in tubular shape is substantially concentric with different diameters
Have been.

[0017] In a state where the slinger 2 to the inner member B is fitted, radial lip 6b, the tip of 6c within the cylindrical portion 2a of the slinger 2, also previously axial lip 6d
The ends 6d ₁ abut against the annular plate 2b of the slinger 2, respectively.

In order to assemble the sealing device having the above-described structure, the sealing member 1 and the slinger 2 are set integrally in advance, and the set sealing device is mounted between the outer member A and the inner member B with the cylindrical portion 2a of the slinger 2. The cylindrical portion 4a of the core of the sealing member 1
At this time, as shown in FIG. 1, the mounting position of the slinger 2 with respect to the seal member 1 in the axial direction may be slightly shifted as shown by a solid line or a broken line.

[0019] Depending on the mounting position of the slinger 2, but displaced along the also axial position of the distal end portion 6d ₁ of the axial lip 2d in contact therewith, the displacement neck 6d
_Since it is absorbed by the elastic deformation of No. ₂ , it does not affect the radial lips 6b and 6c at all. Therefore,
The radial lips 6b, 6c always contact the cylindrical portion 2a of the slinger 2 with an appropriate pressure. Moreover, the neck portion 6d ₂ of the axial lip 6d, since being formed to be thinner than the tip portion 6d ₁ and base portion 6d _3, the distal end portion 6d ₁
Is in contact with the annular plate portion 2b of the slinger 2.
Becomes substantially constant regardless of the magnitude of the deformation of the neck portion 6d _2. Therefore, even if the mounting position of the slinger 2 is slightly different, the hermetically sealed state is always kept good, and the problem that the rotational torque of the inner member B is affected by the change in the contact pressure of the axial lip 6d is also avoided. become.

[0020]

According to the present invention , when the mounting position of the slinger with respect to the seal member in the axial direction is different , the axial
The position of the tip of the rrip in the axial direction can be moved forward and backward.
In addition, the variation of the contact pressure of the axial lip with the slinger can be kept small, and the deformation of the axial lip does not affect the deformation of the radial lip. For this reason, the rotational torque of the inner member is stabilized, and sufficient sealing performance can always be ensured.

[Brief description of the drawings]

1 is a cross-sectional view of the engagement Ru tight sealing apparatus to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state before mounting a bearing of a seal member constituting the sealing device of FIG. 1;

FIG. 3 is a cross-sectional view of a bearing sealing device according to a conventional example.

4 is a cross-sectional view showing a state before mounting a bearing of a sealing member constituting the sealing device of FIG. 3;

[Explanation of symbols]

A: outer member, B: inner member, 1: seal member, 2: slinger, 2a: cylindrical portion, 2b: annular plate portion, 4: cored bar, 6
... elastic body, 6a ... base, 6b, 6c ... radial lip,
6d ... axial lip, 6d ₁ ... tip, 6d ₂ ... neck portion, 6d ₃ ... base portion.

Claims (1)

(57) [Scope of request for utility model registration] 1. An outer member concentrically disposed radially in and out.
Is attached to the opposed annular space between the
A sealing device for partitioning a space in an axial direction, wherein the sealing device is mounted on the outer member and the inner member.
A slinger to be attached, wherein the slinger is fixedly fitted to the outer peripheral surface of the inner member.
And a cylindrical portion which is integrally connected to the
An annular plate portion extending outward and outward, wherein the seal member is fixedly fitted to an inner peripheral surface of the outer member.
A cylindrical portion to be joined, and a diameter
An annular plate portion extending inward in the direction, and attached to the annular plate portion.
To make contact with the annular plate of the slinger from the axial direction.
Having an axial lip made of an elastic material to be applied, and a root portion and a tip portion of the axial lip,
Each is formed in a cylindrical shape that is substantially concentric with different diameters,
The tip is axially displaceable with respect to the root.
Articulated through a neck that is thinner than the end and base
Are, dense sealing device you wherein a.