JP2015175412A - Sealing device and rolling bearing including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device capable of maintaining sealability over a long period while capable of being easily fitted or removed, and a rolling bearing including the sealing device.SOLUTION: A sealing device includes a metal ring 6 and an elastic member 7. The outer diameter side of the elastic member 7 is fitted to an annular groove 25 formed on an inner peripheral surface 21 of an outer ring 2, and its inner diameter side slidably contacts with an outer peripheral surface 31 of a rotational shaft 3. The metal ring 6 includes: a first substantially annular part 61 that has a separation part 63 arranged on the outer diameter side in a radial direction and separating an annular shape at one place in a circumferential direction; a second annular part 62 arranged on the inner diameter side in the radial direction; and a connection part 64 that connects the first substantially annular part 61 and the second annular part 62.

Description

  The present invention relates to a sealing device and a rolling bearing including the same.

  For example, a sealing device attached to a rolling bearing prevents grease filled in the annular bearing inner space from leaking to the outside, and prevents foreign matter such as water and dust from entering the bearing inner space. It is preventing. In this sealing device, an annular elastic member is integrally fixed to a metal ring, and is press-fitted into an inner peripheral surface of an outer ring that is a fixed ring, and is in sliding contact with an outer peripheral surface of an inner ring that is a rotating ring.

  By the way, when the inner ring continues to rotate, the above-mentioned rolling bearing generates heat due to friction and rises in temperature. Since the atmospheric pressure in the bearing internal space rises due to this temperature rise, the sealing device fitted to the outer ring needs to have a large mounting holding force so as not to come off due to the rise in internal pressure. Even when the rolling bearing is used in a bad environment that is affected by foreign matter, the sealing device is fitted to prevent foreign matter from entering the bearing internal space from the fitting portion with the outer ring. It is necessary to improve the sealing performance of the joint.

  As a sealing device for solving such a problem, there is one described in Patent Document 1. This sealing device is configured by integrally fixing an annular elastic member to a metal ring separated at one place in the circumferential direction, that is, a so-called C ring shape. The sealing device is attached to the rolling bearing by fitting a sealing device having a reduced diameter by elastic deformation in an annular groove formed on the inner peripheral surface of the outer ring. The sealing device attached to the rolling bearing increases its diameter so that it returns from its deformed state to its original state, so that the outer peripheral edge fits tightly into the annular groove and improves the sealing performance of the fitting part. At the same time, the mounting holding force is increased. In addition, this sealing device has a C-ring shape to facilitate attachment and removal.

Japanese Utility Model Publication 4-107520

  However, in the sealing device disclosed in Patent Document 1, in the portion where the metal ring is cut, the tightening force is reduced on the outer diameter side, and the elastic member is locally deformed on the inner diameter side, causing uneven wear, and there is a concern that the sealing performance may be reduced. There is. Therefore, the sealing device is easy to attach and detach, but has a large attachment holding force, and it has been a problem to maintain the sealing performance for a long time.

  The present invention has been made in order to solve such problems, and a sealing device capable of maintaining a sealing performance for a long period of time while having a large mounting holding force while being easy to mount and remove. It aims at providing a rolling bearing provided with this.

  In order to solve the above-described problem, the structural feature of the sealing device according to claim 1 includes a metal ring and an annular elastic member fixed integrally to the metal ring, and the inner diameter side of the elastic member. And one of the outer diameter sides is fitted into a radially recessed annular groove formed on the first peripheral surface of the first member, and the other side is connected to the second peripheral surface of the second member. A sealing device for defining an axial one side space and an axial other side space between the first peripheral surface and the second peripheral surface by facing the contact or non-contact, wherein the metal ring is A substantially annular first substantially annular portion that is disposed on the first circumferential surface side in the radial direction and has a separation portion that separates the annular shape at one or more locations in the circumferential direction; and the second circumferential surface side in the radial direction The annular second annular portion disposed in the first annular portion and at least one of the divided pieces divided into one or a plurality of the first substantially annular portions. A connecting portion for connecting the serial and second annular portions, respectively, by providing the.

  According to the sealing device of the first aspect, since the first substantially annular portion of the metal ring is disposed on the first peripheral surface side where the annular groove is formed and has the separation portion, the outer diameter side is reduced by elastic deformation. A sealing device having an enlarged diameter or inner diameter is fitted into the annular groove. Thereby, attachment and removal with respect to the 1st member which has the 1st peripheral surface become easy. In addition, since this sealing device is fitted to the annular groove with a pressing force on one side of the elastic member, the attachment holding force can be increased. Further, in this sealing device, since the second annular portion formed in an annular shape through the connecting portion reinforces the portion where the strength of the first substantially annular portion is reduced by the separating portion, the reduction of the tightening force with respect to the annular groove is reduced. And the local deformation of the elastic member is suppressed, so that the sealing performance can be maintained over a long period of time.

  A structural feature of the rolling bearing according to claim 2 is that the sealing device according to claim 1, the first member, the second member, and the annular first formed on the first member. One track, an annular second track formed on the second member, and a plurality of rolling elements arranged to be rollable between the first track and the second track. It is to prepare.

  The rolling bearing of claim 2 can maintain the sealing performance by the sealing device over a long period of time.

  ADVANTAGE OF THE INVENTION According to this invention, attachment and removal are easy, but attachment holding force is large and can provide a sealing device which can maintain sealing performance over a long term, and a rolling bearing provided with the same.

It is a fragmentary sectional view of the axial direction of the rolling bearing which is one Embodiment of this invention. It is AA sectional drawing of the sealing device shown in FIG. It is sectional drawing of the sealing device explaining a modification.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a sealing device according to the present invention and a rolling bearing including the same will be described with reference to the drawings.

  FIG. 1 is a partial sectional view in the axial direction of a rolling bearing 1 according to an embodiment of the present invention. A rolling bearing 1 shown in FIG. 1 rotatably supports a rotating shaft (second member) 3 for, for example, a water pump for circulating engine cooling water. Specifically, the rolling bearing 1 includes a rotating shaft 3, an outer ring (first member) 2, balls 4 (rolling elements), and a sealing device 5.

  On the outer peripheral surface (second peripheral surface) 31 of the rotating shaft 3, a track (second track) 32 on which the balls 4 roll is formed.

  The outer ring 2 is arranged coaxially with the rotating shaft 3 and radially outward, and is fixed to a housing (not shown). On the inner peripheral surface (first peripheral surface) 21 of the outer ring 2, a track (first track) 22 on which the balls 4 roll is formed. Further, the end surface 23 on one side in the axial direction of the outer ring 2 has a chamfered corner portion 24 on the inner diameter side. In addition, an annular groove 25 that is recessed outward in the radial direction from the inner peripheral surface 21 is formed at the end on the one axial side of the outer ring 2. The annular groove 25 is formed in the vicinity of the other side in the axial direction of the corner portion 24.

  A plurality of balls 4 are arranged and rolled in the annular bearing inner space 11 between the track 32 of the rotary shaft 3 and the track 22 of the outer ring 2.

  The sealing device 5 includes an annular metal ring 6 whose section is formed in a crank shape, and an annular elastic member 7 made of an elastic body that is integrally vulcanized and bonded to the metal ring 6. As a material of the metal ring 6, for example, SPCC of a cold-rolled steel sheet that has been rust-proofed is used.

  The elastic member 7 includes a fitting portion 71 that covers the outer peripheral edge of the metal ring 6, a base portion 72 that extends radially inward from the fitting portion 71, and an outer peripheral surface 31 of the rotary shaft 3 that extends inward from the base portion 72. And a lip 73 slidably contacted at two locations in the axial direction. As a material of the elastic member 7, for example, nitrile rubber is used. The sealing device 5 configured as described above defines an outer space of the bearing in the axial one side space and a bearing inner space 11 in the other axial space, and seals the bearing inner space 11.

  FIG. 2 is a cross-sectional view of the sealing device 5 shown in FIG. The metal ring 6 shown in FIG. 2 includes a substantially annular first substantially annular portion 61 disposed on the outer diameter side and an annular second annular portion 62 disposed on the inner diameter side.

  The first substantially annular portion 61 is provided with a separation portion 63 that separates the annular shape at one place in the circumferential direction. In the first substantially annular portion 61 that is separated and formed of one divided piece, a portion on the opposite side to the separation portion 63 with respect to the axis is connected to a portion of the second annular portion 62 that radially faces this portion. One connecting portion 64 is provided.

  Next, attachment of the sealing device 5 to the rolling bearing 1 will be described with reference to FIGS. 1 and 2. The sealing device 5 uses the separating portion 63 to reduce the outer diameter side by elastic deformation and press-fit from one side in the axial direction. And after the fitting part 71 of the elastic member 7 is guided to the corner | angular part 24, it fits into the annular groove 25, and the sealing device 5 is attached to the rolling bearing 1. FIG.

  Thus, since the sealing device 5 is provided with the separation portion 63 in the first substantially annular portion 61 that is the side that fits into the annular groove 25, the outer diameter side can be reduced, and the rolling bearing 1. Easy to attach to.

  Further, when the sealing device 5 attached to the rolling bearing 1 is removed, the outer diameter side can be reduced in diameter as in the case of attachment, and the removal from the rolling bearing 1 becomes easy.

  Next, a state where the sealing device 5 is attached to the rolling bearing 1 will be described with reference to FIGS. 1 and 2. The sealing device 5 is expanded so that the outer diameter side returns from the deformed state to the original state, so that the outer peripheral edge is fitted to the annular groove 25 with a pressing force, and the sealing performance of the fitting portion 71 is improved. At the same time, the mounting holding force is increased.

  Further, according to the sealing device 5, the second annular portion 62 formed in an annular shape via the connecting portion 64 reinforces a portion where the strength of the first substantially annular portion 61 is reduced by the separation portion 63. Therefore, according to the sealing device 5, a decrease in the pressing force with respect to the annular groove 25 is suppressed, and local deformation on the side of the fitting portion 71 and the lip 73 in the elastic member 7 is suppressed, so that the sealing performance is maintained for a long time. can do.

In addition, this invention is not limited to this embodiment, In the range which does not deviate from the summary of this invention, it can implement with a various form.
In the present embodiment, the rolling element is composed of the balls 4. However, the present invention is not limited to this, and may be applied to a configuration such as a cylindrical roller or a tapered roller.

  In the present embodiment, the connecting portion 64 that connects the first substantially annular portion 61 and the second annular portion 62 is provided at one location, but the present invention is not limited to this, and at least one location is provided. That's fine.

  Further, in the present embodiment, the separation part 63 is provided at one place of the first substantially annular part 61. However, the present invention is not limited to this. For example, when the separation part 63 is provided at two or more places, the separation part 63 is divided thereby. You may apply to the structure which connects all the division pieces and the 2nd cyclic | annular part 62 with the some connection part 64, respectively.

  In the present embodiment, the elastic member 7 of the sealing device 5 is configured to be in sliding contact with the outer peripheral surface 31 of the rotating shaft 3. However, the present invention is not limited thereto, and for example, the elastic member 7 contacts the outer peripheral surface 31 of the rotating shaft 3. You may apply to the structure made into non-contact.

Further, in this embodiment, the sealing device 5 is configured to be fitted into the annular groove 25 formed in the inner peripheral surface 21 of the outer ring 2, but the present invention is not limited thereto, and for example, the sealing device is an outer peripheral surface of the inner ring. You may apply to the structure fitted by.
FIG. 3 is a cross-sectional view of a sealing device 5a for explaining this modification. A sealing device 5a shown in FIG. 3 includes an annular metal ring 6a and an annular elastic member 7a made of an elastic material that is integrally vulcanized and bonded to the metal ring 6a. The elastic member 7a includes a fitting portion 71a that covers the inner periphery of the metal ring 6a, a base portion 72a that extends radially outward from the fitting portion 71a, and an outer ring that is a rotating wheel that extends outward from the base portion 72a. And a lip 73a that is in sliding contact with the inner peripheral surface. The metal ring 6a includes a substantially annular first substantially annular portion 61a disposed on the inner diameter side, and an annular second annular portion 62a disposed on the outer diameter side. The first substantially annular portion 61a is provided with a separation portion 63a for separating the annular shape at one place in the circumferential direction. In the first substantially annular portion 61a, which is separated and made up of one divided piece, a portion on the opposite side to the separating portion 63a with respect to the axis is connected to a portion of the second annular portion 62a that radially faces this portion. One connecting portion 64a is provided.

  The sealing device 5a configured as described above has an annular groove (not shown) formed on the outer peripheral surface of an inner ring (not shown) which is a fixed ring by expanding the inner diameter side by elastic deformation using the separating portion 63a. The sealing device 5 is attached to a rolling bearing (not shown). Thereby, the sealing device 5a can be easily attached to and detached from the rolling bearing. Moreover, the sealing device 5a has a large mounting holding force and can maintain the sealing performance for a long period of time, like the sealing device 5.

  In the present embodiment, the sealing device 5 is attached to the rolling bearing 1, but the present invention is not limited to this. For example, the sealing device 5 may be applied to a device other than the rolling bearing.

1: rolling bearing, 2: outer ring (first member), 3: rotating shaft (second member), 4: ball (rolling element), 5, 5a: sealing device, 6, 6a: metal ring, 7, 7a: elastic member, 11: bearing inner space, 21: inner peripheral surface (first peripheral surface), 22: track (first track), 23: end surface, 24: corner, 25: annular groove, 31: Outer peripheral surface (second peripheral surface), 32: track (second track), 61, 61a: first substantially annular portion, 62, 62a: second annular portion, 63, 63a: separation portion, 64, 64a: connecting part 71, 71a: fitting part 72, 72a: base part 73, 73a: lip

Claims (2)

A metal ring and an annular elastic member fixed integrally to the metal ring;
One of the inner diameter side and the outer diameter side of the elastic member is fitted into a radially recessed groove formed on the first peripheral surface of the first member, and the other side of the elastic member is the second member. A sealing device that delimits an axial one side space and an axial other side space between the first peripheral surface and the second peripheral surface by facing the second peripheral surface in contact or non-contact. And
The metal ring is disposed on the first circumferential surface side in the radial direction and has a substantially annular first substantially annular portion having a separation portion that cuts off the annular shape at one or more locations in the circumferential direction, and the radial second An annular second annular portion disposed on the peripheral surface side of the first annular portion, and the first annular portion divided by the cut-off portion and all of the plurality of divided pieces and the second annular portion at least at one location And a connecting part that connects the parts to each other.   The sealing device according to claim 1, the first member, the second member, an annular first track formed on the first member, and the second member. A rolling bearing comprising: an annular second raceway; and a plurality of rolling elements arranged to roll between the first raceway and the second raceway.

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