JPH085375Y2 - Bearing sealing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a bearing sealing device provided with a seal annulus forming a non-contact seal structure and a contact seal structure on the inner ring side of a bearing.

<Prior Art> A conventional sealing device for a bearing of this type will be described with reference to FIG.

FIG. 6 is a sectional view showing a main part of a bearing sealing device.

In the figure, reference numeral 1 is a deep groove ball bearing, and an outer ring 2 of the deep groove ball bearing 1 is formed with a circumferential groove 2a at an end portion of an inner circumferential surface, and a shoulder portion of the inner ring 3 is deep in a radial center side. A peripheral step portion 3a is formed.

Reference numeral 4 denotes a seal ring body, and the outer peripheral edge of the seal ring body 4 is fixed to the peripheral groove 2a of the outer ring 2, and the inner peripheral side is provided with a non-contact seal structure and a contact seal structure in the peripheral step portion 3a of the inner ring 3. I am configuring.

 The seal ring body 4 will be specifically described.

The seal ring body 4 is a state in which an annular portion 5 that closes the axial gap between the outer ring 2 and the inner ring 3 and a side surface 3b of the circumferential step portion 3a of the inner ring 3 is provided on the radially inner end side of the annular portion 5. The main lip 6 provided on the inner ring 3, the auxiliary lip 7 having a substantially triangular cross-section that protrudes inward from the bearing along the outer peripheral surface of the inner ring 3, and the main lip 6 axially protrudes toward the radially inner end. The formed annular convex portion 8 is provided.

The auxiliary lip 7 has a tapered surface 7a on the outer diameter side, and the tapered surface 7a guides the flow of the lubricant flowing by the rotation of the bearing 1 toward the inside of the bearing 1.

The main lip 6 has an inner side surface and a side surface 3b of the step portion 3a of the inner ring 3.
A small gap L ₁ is formed between the inner peripheral surface 7 b and the outer peripheral surface of the inner ring 3 of the auxiliary lip 7, and a small gap L ₂ is formed between the inner peripheral surface 7 b and the outer peripheral surface of the inner ring 3.

The small gap L ₁ and the small gap L ₂ are continuous to form an annular labyrinth seal having a substantially “L” -shaped cross section.

The annular convex portion 8 forms a small gap L ₃ which is inclined toward the outer side of the bearing between the inner end surface 8a and the outer peripheral surface 3c of the peripheral step portion 3a, and the annular convex portion 8 has the peripheral step portion 3a. Lightly abuts the side surface 3b of the. The contact pressure is set extremely small due to the flexibility of the main lip 6.

The labyrinth seal composed of the small gaps L ₁ and L ₂ and the contact portion between the annular convex portion 8 and the side surface 3b of the circumferential step portion 3a prevent the lubricant inside the bearing 1 from leaking to the outside of the bearing. , Small gap L ₃ and side surface 3b of annular projection 8 and peripheral step 3a
The abutting portion prevents contact of water droplets and dust from the outside of the bearing into the inside of the bearing.

Such a seal ring body 4 is reinforced by an annular core metal 9.

The inner diameter of the cored bar 9 is smaller than the outer diameter of the inner ring 3, and is embedded in the region of the seal ring body 4 from the outer ring fixed side to the main lip 6.

Tongue-shaped bent portions 9a, which are bent along the inner peripheral surface 7b of the auxiliary lip 7, are formed at a plurality of positions in the circumferential direction at positions corresponding to the auxiliary lip 7 in the core metal 9. Substantially rectangular hole portions 9b are formed at a plurality of positions in the circumferential direction.

The bent portions 9a are arranged at predetermined intervals in the circumferential direction, and each of the bent portions 9a is exposed on the inner peripheral surface 7b of the auxiliary lip 7 and faces the outer peripheral surface of the inner ring 3.

The hole portion 9b is for improving the flow of the lip raw material of the auxiliary lip 7 during the insert molding of the seal ring body 4.

<Problems to be Solved by the Invention> However, the conventional example having such a configuration has the following problems.

Since the bent portions 9a of the cored bar 9 are exposed on the inner peripheral surface 7b of the auxiliary lip 7 at predetermined intervals in the circumferential direction, the bent portion 9a on the inner peripheral surface 7b of the auxiliary lip 7 is not manufactured. Although there is no sink mark at all, there is a risk that sink marks will be concentrated between the bent portions 9a and recessed.

That is, since the inner peripheral surface 7b of the auxiliary lip 7 is likely to be uneven due to the presence of the bent portion 9a, a sufficient labyrinth effect can be obtained in the small gap L ₂ formed between the inner peripheral surface 7b and the outer peripheral surface of the inner ring 3. I can not expect it.

The present invention was created in view of such circumstances,
The purpose of the invention is to prevent local sink marks from being generated on the inner peripheral surface of the auxiliary lip and to ensure sufficient sealing performance.

<Means for Solving Problems> In order to achieve such an object, the present invention has the following configuration.

That is, the bearing sealing device according to the present invention is a seal ring body that is fixed to the outer ring of the bearing and forms a non-contact seal structure and a contact seal structure with the peripheral step portion provided on the shoulder portion of the inner ring of the bearing. And an annular portion provided in a state where the seal ring body closes an axial gap between the outer ring and the inner ring, and an inner end side of the annular portion directed toward the radial center. A main lip having a predetermined flexibility and forming a small gap between the side surface of the peripheral step portion and the side surface of the peripheral step portion, and provided in a state of protruding along the outer peripheral surface of the inner ring inward of the bearing, An auxiliary lip that forms a small gap that is continuous with the small gap with the outer peripheral surface near the peripheral step portion of the inner ring, and is provided on the inner end side of the main lip and faces the outer peripheral surface of the peripheral step portion. In this state, it consists of an annular projection that comes into light contact with the side surface of this peripheral step. Annular portion, the main lip and the core metal portion in the auxiliary lip are respectively provided, the core metal portion provided on the auxiliary lip is disposed in a state along the tapered surface of the formed on the outer diameter side of the auxiliary lip.

<Operation> The operation of the configuration of the present invention is as follows.

Although reinforcing the auxiliary lip by providing the core metal part on the auxiliary lip is the same as before, the core metal part is placed along the tapered surface of the auxiliary lip and the core metal part is radiated from the inner peripheral surface of the auxiliary lip. The presence of the cored bar portion is independent of the sink mark on the inner peripheral surface of the auxiliary lip because it is separated outward in the direction.

<Embodiment> An embodiment of the present invention will be described below in detail with reference to the drawings.

1 to 3 show an embodiment of the present invention. In this embodiment, a case where one annular core metal is used will be described.

FIG. 1 is a vertical sectional front view of a half portion of a bearing sealing device, FIG. 2 is a front view of a core metal, and FIG. 3 is an enlarged perspective view of a portion A shown in FIG.

In the figure, reference numeral 10 is a deep groove ball bearing, and an outer ring 11 of the deep groove ball bearing 10 is formed with a circumferential groove 12 at an end portion of an inner peripheral surface, and a shoulder portion of the inner ring 13 is deep in a radial center side. A peripheral step portion 14 is formed.

Reference numeral 20 is a seal ring body, and the outer peripheral edge of the seal ring body 20 is an outer ring.
It is fixed to the peripheral groove 12 of 11, and the inner peripheral side is the peripheral step portion of the inner ring 13.
In 14, a non-contact seal structure and a contact seal structure are formed.

 The seal ring body 20 will be specifically described.

The seal ring body 20 is a state in which an annular portion 21 that closes the axial gap between the outer ring 11 and the inner ring 13 and a side surface 15 of the circumferential step portion 14 of the inner ring 13 on the radially inner end side of the annular portion 21. A main lip 22 provided on the inner ring 13, an auxiliary lip 23 having a substantially triangular cross-section protruding inward of the bearing along the outer peripheral surface of the inner ring 13, and the main lip 22.
And an annular convex portion 24 formed so as to project in the axial direction at the inner end in the radial direction.

The main lip 22 is formed so that its radial dimension 1 is as long as possible so that it has a predetermined flexibility.

The auxiliary lip 23 has a tapered surface 23a on the outer diameter side, and the tapered surface 23a guides the flow of the lubricant flowing by the rotation of the bearing 10 toward the inside of the bearing 10.

The annular convex portion 24 is in light contact with the side surface 15 of the circumferential step portion 14,
The contact pressure is set extremely small due to the flexibility of the main lip 22.

A small gap L ₁ is formed between the inner side surface of the main lip 22 and the side surface 15 of the circumferential step portion 14 of the inner ring 13, and the inner peripheral surface 23b of the auxiliary lip 23 and the outer peripheral surface of the inner ring 13 are separated from each other. Small gap between h ₂
Is formed. The small gap h ₁ and the small gap h ₂ are continuous and form an annular labyrinth seal having a substantially “L” -shaped cross section.

The annular convex portion 24 forms a small gap h ₃ inclined between the inner end surface 25 and the outer peripheral surface 16 of the peripheral step portion 14 toward the outside of the bearing.

With the labyrinth seal formed by the small gaps h ₁ and h ₂ and the contact portion between the annular convex portion 24 and the side surface 15 of the circumferential step portion 14,
The lubricant inside the bearing 10 is prevented from leaking to the outside of the bearing, and the small gap h ₃ and the contact portion between the annular convex portion 24 and the side surface 15 of the circumferential step portion 14 prevent the lubricant from entering the bearing from the outside. Prevents ingress of water droplets and dust.

In such a seal ring body 20, an annular core metal 30 is embedded from the outer ring fixed side to a predetermined position of the main lip 22.

The inner diameter of the core metal 30 is smaller than the outer diameter of the inner ring 13. The flat portion 31 of the cored bar 30 is provided with holes 32 at a plurality of positions in the circumferential direction at positions corresponding to the auxiliary lips 23, and a tongue-shaped bent portion 33 bent inward of the bearing is provided. It is provided at multiple locations in the circumferential direction.

The hole 32 and the bent portion 33 are simultaneously formed by, for example, press molding.

Since the hole portion 32 serves as a flow path for the lip raw material when the seal ring body 20 is formed by insert molding, the presence of the cored bar 30 does not hinder the formation of the auxiliary lip 23 in a predetermined shape. .

The bent portion 33 is arranged inside the auxiliary lip 23 so as to be exposed along the tapered surface 23a thereof, and is arranged at a position radially outward from the inner peripheral surface 23b of the auxiliary lip 23.

As described above, in the present embodiment, the reinforcement of the auxiliary lip 23 by the bent portion 33 of the cored bar 30 is the same as that described in the prior art, but this bent portion 33 is formed from the inner peripheral surface 23b of the auxiliary lip 23. Since they are arranged radially outwardly, the presence of the bent portion 33 is independent of the sink mark on the inner peripheral surface 23b.

For this reason, even if sink marks are generated on the inner peripheral surface 23b of the auxiliary lip 23, the degree of the sink mark is substantially constant, so that the inner peripheral surface 23b of the auxiliary lip 23 is uneven as in the conventional case. There is no.

Since no unevenness is formed on the inner peripheral surface 23b of the auxiliary lip 23, a small gap h ₂ formed between the inner peripheral surface 23b and the outer peripheral surface of the inner ring 13
Is almost uniform, and the sealing effect is sufficiently exerted in this part.

Further, if the cored bar 30 is positioned on the main lip 22 so that the main lip 22 retains the required predetermined flexibility based on the radial dimension l of the main lip 22, the radial dimension l of the main lip 22 can be set.
Even if the length is increased, it is possible to prevent the main lip 22 from wobbling abnormally during rotation. Therefore, the contact state of the annular convex portion 24 with the side surface 15 of the circumferential step portion 14 can be maintained in a preferable state, and if the radial dimension l of the main lip 22 is lengthened, the sealing performance can be improved accordingly. it can.

It should be noted that although the example in which one core metal 30 is used has been described in the above embodiment, the present invention is not limited to this, and for example, the fourth
As shown in the drawings and FIG. 5, it is possible to use two cored bars.

4 and 5 show another embodiment of the present invention. FIG. 4 is a cross-sectional view showing a main part of the bearing sealing device, and FIG. 5 is a partial perspective view of the core metal shown in FIG.

In these figures, the same reference numerals as those given in FIGS. 1 to 3 indicate the same parts or corresponding parts.

In this embodiment, only the structure different from the above embodiments will be described.

The seal ring body 20 is provided with a first core metal 30a and a second core metal 30b.

The inner diameter of the first cored bar 30a is larger than the outer diameter of the inner ring 13, and this is embedded in the annular portion 21 of the seal annulus 20.

The outer diameter of the second core metal 30b is configured to be larger than the outer diameter of the inner ring 13, and the plane portion 31b of the second core metal 30b is embedded in the main lip 22.

Holes 3 are formed at a plurality of positions in the circumferential direction near the outer peripheral edge of the flat surface portion 31b.
2b is formed.

The outer peripheral end of the second core metal 30b is provided with a tapered annular flange 33b whose diameter is reduced inward of the bearing.

The annular flange 33b is positioned inside the auxiliary lip 23 so as to be exposed along the tapered surface 23a of the auxiliary lip 23, and is separated from the inner peripheral surface 23b of the auxiliary lip 23 in the radial direction.

In the case of this embodiment, the annular flange is formed on the auxiliary lip 23.
Since 33b are continuously provided in the circumferential direction and the thickness of the lip portion of the auxiliary lip 23 can be made uniform, the presence of the annular flange 33b does not affect the sink mark of the inner peripheral surface 23b of the auxiliary lip 23 at all. . Therefore, the cylindricity of the inner peripheral surface 23b of the auxiliary lip 23 can be further improved as compared with the above embodiment.

<Effects of the Invention> According to the present invention, the following effects are exhibited.

Since the core metal part is arranged along the taper surface of the auxiliary lip and the core metal part is separated from the inner peripheral surface of the auxiliary lip, the existence of this core metal part is a sink mark of the inner peripheral surface of the auxiliary lip. Get irrelevant.

Therefore, while reinforcing the auxiliary lip with the core bar, it is possible to eliminate local depressions on the inner peripheral surface of the auxiliary lip as in the conventional case. It is possible to make the small gap formed in the circumferential direction substantially uniform, and as a result, it is possible to exert sufficient sealing performance.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention.
FIG. 2 is a sectional view showing a main part of a bearing sealing device, FIG. 2 is a front view of the core metal shown in FIG. 1, and FIG. 3 is an enlarged perspective view of a portion A of FIG. 4 and 5 relate to another embodiment of the present invention. FIG. 4 is a sectional view showing a main part of a bearing sealing device, and FIG. 5 is a partial perspective view of a core bar shown in FIG. is there. FIG. 6 is a sectional view showing a main part of a bearing sealing device according to a conventional example. 10 …… Bearing 11 …… Outer ring 13 …… Inner ring 14 …… Surrounding step 15 …… Side surface 20 …… Seal ring 21 …… Annular part 22 …… Main lip 23 …… Auxiliary lip 23a …… Tapered surface 23b… … Inner surface 24 …… Annular protrusion 30,30a, 30b… Core metal.

Claims (3)

[Scope of utility model registration request] 1. A bearing sealing device comprising a seal ring body fixed to an outer ring of a bearing and forming a non-contact seal structure and a contact seal structure with a peripheral step portion provided on a shoulder portion of the inner ring of the bearing. In the above, the seal ring body is provided with an annular portion provided in a state of closing the axial gap between the outer ring and the inner ring, and provided on the inner end side of the annular portion toward the radial center,
While forming a small gap with the side surface of the peripheral step portion,
A small lip which is provided in a state of protruding along the outer peripheral surface of the inner ring inside the bearing and having a predetermined flexibility and an outer peripheral surface in the vicinity of the peripheral step portion of the inner ring and which is continuous with the small gap. The auxiliary lip that forms a gap, and an annular convex portion that is provided on the inner end side of the main lip and that abuts the side surface of the peripheral step portion in a state of facing the outer peripheral surface of the peripheral step portion. The core, the main lip and the auxiliary lip are respectively provided, and the metal core provided on the auxiliary lip is arranged along the tapered surface formed on the outer diameter side of the auxiliary lip. Characteristic bearing sealing device. 2. The bearing sealing device according to claim 1, wherein the core portion provided on the annular portion, the main lip and the auxiliary lip are integrally formed. 3. A cored bar portion provided on the main lip and the auxiliary lip is integrally configured, and the cored bar portion and the cored bar portion provided on the annular portion are separately configured. The bearing sealing device according to claim (1) of the utility model registration claim.