JP2008256163A - Sealing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device capable of effectively suppressing the leakage of a sealed object from a metal fitting part of an annular member, in a sealing device composed of a combination of a lip seal and the annular member. <P>SOLUTION: The sealing device 1 is composed of a combination of a lip seal 2 mounted to one of two relatively rotating members and the annular member 11 composed of a rigid material such as metal mounted to the other member. The lip seal 2 has an attachment ring 3 of the rigid material such as metal fit to the former member and a side lip 5 and a radial lip 6 formed of a rubber-like elastic body 4 adhered to the attachment ring 3. The annular member 11 has a flange-like flat surface 11a arranged in the axial direction of the side lip 5 and slidably and closely contacting with the side lip 5 and a cylindrical attachment part 11b integrally molded to an axial direction from the inner circumferential end of a flat part 11a and fit with the other member. The radial lip 6 of the lip seal 2 slidably and tightly contacts with the circumferential surface of the other member. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sealing device according to a sealing technique. The sealing device of the present invention is used, for example, as a hub bearing seal in an automobile-related field, or used in each related field such as a home appliance, an industrial machine, or a bicycle.

  Conventionally, a sealing device 51 shown in FIG. 6 is known, and this sealing device 51 is used as a hub bearing seal in a bearing portion of an automobile wheel suspension device, and is provided on the inner peripheral side of a bearing outer ring 61. It is configured by a combination of a lip seal 52 to be mounted and a ring member (slinger) 53 to be mounted on the outer peripheral side of the bearing inner ring 62.

  The ring member 53 is a metal ring having a substantially L-shaped cross section as shown in the figure, and is fitted to the outer peripheral surface of the bearing inner ring 62 with its cylindrical mounting portion 53a. The lip seal 52 is formed by attaching a rubber-like elastic body 55 to a mounting ring 54 having a substantially L-shaped cross section that is fitted to the inner peripheral surface of the bearing outer ring 61. A side lip 56 and a radial lip 57 that are slidably in close contact with the ring member 53 are formed.

  However, the above prior art has the following disadvantages.

  That is, in the sealing device 51, the ring member 53, which is a metal ring, is fitted to the bearing inner ring 62, and only the ring member 53 comes into contact with the bearing inner ring 62, and a rubber-like shape such as a radial lip 57 that exhibits a sealing action. The elastic body 55 is configured not to contact the bearing inner ring 62 at all. Therefore, there is a possibility that the sealing object may leak from between the ring member 53 and the bearing inner ring 62 which are metal fitting portions, and countermeasures are desired.

JP 2001-141069 A

  An object of this invention is to provide the sealing device which can suppress effectively that a sealing target object leaks from the fitting part of a ring member in view of the above point.

  In order to achieve the above object, a sealing device according to claim 1 of the present invention is made of a lip seal attached to one of two relatively rotating members, and a rigid material such as a metal attached to the other member. A sealing device comprising a combination with a ring member, wherein the lip seal is formed by a mounting ring made of a rigid material such as a metal fitted to the one member and a rubber-like elastic body attached to the mounting ring. A side lip and a radial lip, and the ring member is disposed on one side of the side lip in the axial direction so that the side lip is slidably in contact therewith, and an inner side of the plane portion. A cylindrical mounting portion that is integrally formed from the peripheral end portion in one axial direction and is fitted to the other member, and the radial lip of the lip seal slides on the peripheral surface of the other member. Features close contact freely It is intended to.

  The sealing device according to claim 2 of the present invention is the sealing device according to claim 1, wherein a bent portion having a taper shape or a circular arc shape is provided at an inner peripheral end portion of the flat portion of the ring member. The mounting portion is integrally formed through the bent portion, and a space portion is provided on the inner peripheral side of the flat portion and the bent portion so that a radial lip of the lip seal does not interfere with the ring member. It is a feature.

  Further, the sealing device according to claim 3 of the present invention is the sealing device according to claim 2 described above, wherein when a plurality of ring members are stacked, the bent portion of the ring member above the mounting portion of one ring member is bent. The two ring members have a structure that is positioned in the radial direction.

  The sealing device according to claim 4 of the present invention is the sealing device according to claim 1, wherein a protrusion made of a rubber-like elastic body is provided on the other end surface in the axial direction of the flat surface portion of the ring member. The labyrinth seal is formed between the lip seal and the lip seal by being arranged close to the lip seal when the ring member is combined with the lip seal. In addition, when the ring member is pushed into the lip seal and displaced in the axial direction, the ring member abuts on the lip seal, thereby acting as a stopper for regulating the interval between the ring member and the lip seal.

  The sealing device according to claim 5 of the present invention is the sealing device according to claim 4, wherein a protrusion made of a rubber-like elastic body is provided on one end face in the axial direction of the lip seal. The labyrinth is disposed between the side lip of the ring member and the protrusion provided on the ring member, and is disposed close to the ring member when the ring member is combined with the lip seal. A seal is formed.

  The sealing device according to claim 6 of the present invention is the sealing device according to claim 1, wherein a lip support portion made of a rubber-like elastic body is provided on the inner peripheral side of the mounting ring in the lip seal. Since the side lip is integrally formed with the part, the inner diameter dimension of the mounting ring is set larger than the diameter dimension of the base end part of the side lip. A space for installing other parts is provided on the other side in the axial direction.

  Furthermore, the sealing device according to claim 7 of the present invention is the sealing device according to any one of claims 1 to 6, wherein a magnetic encoder is attached to one end surface in the axial direction of the flat portion of the ring member. It is characterized by.

  In the sealing device 51 of FIG. 6 according to the prior art, the ring-shaped member 53 has a cylindrical mounting portion 53a disposed on the inner peripheral side of the radial lip 57, and the radial lip 57 is in close contact with the outer peripheral surface of the mounting portion 53a. Due to the structure, the radial lip 57 cannot be brought into close contact with the bearing inner ring 62. On the other hand, in this invention, the attaching part of the ring member is provided in the axial direction opposite to the above-described conventional technique, and is disposed at a position away from the inner peripheral side of the radial lip. Since the radial lip is in direct contact with the outer peripheral surface of the bearing inner ring (the peripheral surface of the other member), the sealing object to be leaked from the metal fitting portion of the ring member is sealed by the radial lip. It is possible.

  Further, in the present invention, the ring member is disposed on one side of the side lip in the axial direction so that the side lip is slidably in close contact with the flange, and from the inner peripheral end of the flat portion toward the one side in the axial direction. It has a cylindrical mounting portion that is integrally molded and fitted to the other member. Therefore, the fact that the cross-sectional shape of the ring member is substantially L-shaped is the same as in the prior art, and the only difference is that the direction of the cylindrical mounting portion is opposite to the axial direction. Another difference is that the radial lip is conventionally arranged on the outer peripheral side of the mounting portion as described above. However, in the present invention, the mounting portion and the radial lip are arranged in the axial direction, and the radial lip is in the ring member. It arrange | positions in the nearest position of the inner peripheral edge part of a plane part. Therefore, in the present invention, as a further configuration, a bent portion having a taper shape or a circular arc shape is provided at the inner peripheral end of the flat portion of the ring member, and the mounting portion is integrally formed through the bent portion, and the flat portion and A space for preventing the radial lip of the lip seal from interfering with the ring member is provided on the inner peripheral side of the bent portion, so that a sufficient lip setting space can be secured. The bent portion is also used as a radial positioning portion when a plurality of ring members are stacked.

  Further, in the present invention, a projection made of a rubber-like elastic body is provided on the other end surface in the axial direction of the plane portion of the ring member, and this projection is arranged on the outer peripheral side of the side lip in the lip seal. When the ring member is combined with the lip seal, the labyrinth seal is formed between the lip seal and the lip seal. When it is pushed and displaced in the axial direction, it abuts on the lip seal to act as a stopper for regulating the interval between the ring member and the lip seal. Therefore, the provision of such protrusions makes it possible to improve the sealing performance, and when the ring member is pushed into the lip seal and axially displaced, the side lip is between them. It is possible to prevent crushing.

  In the present invention, a protrusion made of a rubber-like elastic body is also provided on one end face in the axial direction of the lip seal, and this protrusion is between the side lip of the lip seal and the protrusion provided on the ring member. When the ring member is combined with the lip seal, the labyrinth seal is formed between the ring member and the ring member. Therefore, by providing such a projection, it is possible to further improve the sealing performance.

  Further, in the present invention, a lip support portion made of a rubber-like elastic body is provided on the inner peripheral side of the mounting ring in the lip seal, and the side lip is integrally formed on the lip support portion, whereby the base end portion of the side lip The inner diameter dimension of the mounting ring is set to be larger than the inner diameter dimension of the mounting ring, and a space for installing other components is provided on the inner peripheral side of the mounting ring and on the other side in the axial direction of the lip support section. Therefore, by providing such a space portion, it is possible to effectively utilize a limited space.

  The present invention has the above effect when applied to a sealing device having a specification equipped with a magnetic encoder, and the positioning in the radial direction by the bent portion also has an incidental effect of preventing a scratch on the encoder surface.

The present invention includes the following embodiments.
(1) As an example of shape, the ring member fitted to the rotating part (inner ring) is extended to the atmosphere side opposite to the bearing side, and the lip on the shaft side is slid (seal) on the sleeve In addition, since the inner ring side can be slid (seal), the sealing property of the metal fitting portion can be maintained by the lip.
(2) By making the bent portion of the sleeve into a taper or a large R shape, a sufficient space for setting the lip on the shaft side can be secured (equal or less than the current space).
(3) Since the taper or large R of the bent portion of the sleeve overlaps in this portion even when the encoders are stacked in manufacturing, it is possible to prevent radial displacement and to prevent scratches on the encoder surface.
(4) The shape of the sleeve outer peripheral rubber stopper is a projection, and when the seal and the encoder (sleeve) are assembled, a labyrinth effect can be achieved and an improvement in sealing performance can be aimed at.
(5) The labyrinth can be further improved by providing a protrusion in the center of the seal in accordance with the protrusion set on the encoder side.
(6) Even when the protrusion on the sleeve outer peripheral rubber stopper is pushed in due to its own weight or the like during product stacking, it functions as a stopper and there is no fear of the seal-side lip being crushed.
(7) Rubber-like protrusions are set on the bottom surface portion on the seal side, which enables stacking without interfering with each lip during product stacking.
(8) It should be noted that the shape example has the same contents as the present plan as long as it is a specification that can be expected to have the same effect other than the present shape. It can be set arbitrarily in terms of space and built-in.
(9) As a further shape example, in the case where the space is set to be minimal, a specification in which the hollow portion of the seal ring is largely shifted to the outer diameter side and the lip portion is set only by the rubber portion is included.

  Next, embodiments of the present invention will be described with reference to the drawings.

First embodiment ...
FIG. 1 shows a cross section of a main part of a sealing device 1 according to a first embodiment of the present invention. The sealing device 1 according to the embodiment is used as a hub bearing seal in a bearing portion of an automobile wheel suspension device, and is configured as follows.

  That is, first, the sealing device 1 is configured by a combination of a lip seal 2 mounted on the inner peripheral side of the bearing outer ring 61 and a ring member (slinger) 11 mounted on the outer peripheral side of the bearing inner ring 62.

  The lip seal 2 is obtained by attaching (vulcanizing and bonding) a rubber-like elastic body 4 to a metal mounting ring 3 fitted to the inner peripheral surface of the bearing outer ring 61. Side lips 5 and radial lips 6 are formed. On the other hand, the ring member 11 is made of a metal ring, and is disposed on one side (upward in the drawing) of the side lip 5 so that the side lip 5 is slidably in close contact with the flange-like flat surface portion 11a. A cylindrical mounting portion 11b that is integrally formed from the inner peripheral end portion in one axial direction and is fitted to the outer peripheral surface of the bearing inner ring 62 is integrally provided. The radial lip 6 is slidably in close contact with the outer peripheral surface of the bearing inner ring 62 located on the inner peripheral side thereof.

  A bent portion 11c having a taper shape or a cross-sectional arc shape is provided at an inner peripheral end portion of the flat surface portion 11a in the ring member 11, and an attachment portion 11b is integrally formed through the bent portion 11c. A space 12 for preventing the radial lip 6 from interfering with the ring member 11 is provided on the inner peripheral side of the portion 11a and the bent portion 11c.

  The bent portion 11c is also used as a radial positioning portion when a plurality of ring members 11 are stacked. That is, as shown in FIG. 2, when the plurality of ring members 11 are stacked, the bent portion 11c of the ring member 11 thereabove is placed on the attachment portion 11b of one ring member 11, and at this time, the attachment portion 11b Is engaged in the radial direction in a state of being fitted into the recess by the bent portion 11c, and thus the upper and lower ring members 11 are configured to be positioned in the radial direction.

  A magnetic encoder 13 is attached to one end face of the ring member 11 in the axial direction of the flat portion 11a. The magnetic encoder 13 is formed in a ring shape by a rubber-like elastic body mixed with magnetic powder and is multi-pole in the circumferential direction, and when the pulse signal is read by the sensor unit 14 during rotation, It is used for detecting the number of rotations and rotation angle.

  Further, a projection 15 made of a rubber-like elastic body is provided on the end surface of the other side in the axial direction (downward in the drawing) of the flat portion 11a in the ring member 11. The protrusion 15 is arranged on the outer peripheral side of the side lip 5 in the lip seal 2, and is disposed close to the lip seal 2 when the ring member 11 is combined with the lip seal 2, so The labyrinth seal 16 is set to be formed, and as shown in FIG. 3, the ring member 11 is brought into contact with the lip seal 2 when the ring member 11 is pushed into the lip seal 2 and displaced in the axial direction. Is set so as to act as a stopper for regulating the distance between the lip seal 2 and the lip seal 2. The protrusion 15 is formed in an annular shape.

  Further, a protrusion 7 is provided by a rubber-like elastic body 4 on one end face in the axial direction of the lip seal 2. The protrusion 7 is disposed between the side lip 5 of the lip seal 2 and the protrusion 15 provided on the ring member 11, and is disposed close to the ring member 11 when the ring member 11 is combined with the lip seal 2. Thus, the labyrinth seal 8 is set between the ring member 11 and the ring member 11. The protrusion 7 is formed in an annular shape.

  Further, a protrusion 9 is provided by a rubber-like elastic body 4 on the other end face in the axial direction of the lip seal 2. As shown in FIG. 4, when the plurality of sealing devices 1 are stacked, the protrusion 9 is placed on the magnetic encoder 13 in the sealing device 1 positioned below the protrusions 9. It is provided to prevent sticking. Although the protrusions 9 are formed in an annular shape, a plurality of protrusions 9 may be arranged on the circumference.

  The sealing device 1 having the above configuration is used as a hub bearing seal as described above, and seals foreign matter such as muddy water and dust outside the bearing from entering the inside of the bearing. It has a feature in that there are operational effects.

  That is, first, in the sealing device 1, the mounting portion 11 b of the ring member 11 is provided in one axial direction opposite to the conventional one, and the radial lip 6 of the lip seal 2 slides directly on the outer peripheral surface of the bearing inner ring 62. Since it is in close contact with each other, foreign matter such as muddy water that leaks from the metal fitting portion of the ring member 11 can be sealed by the sealing action of the radial lip 6. Therefore, the sealability of the part can be improved.

  Further, a bent portion 11c having a taper shape or a cross-sectional arc shape is provided at an inner peripheral end portion of the flat surface portion 11a in the ring member 11, and the attachment portion 11b is integrally formed through the bent portion 11c, and the flat surface portion 11a and Since the space part 12 for preventing the radial lip 6 of the lip seal 2 from interfering with the ring member 11 is provided on the inner peripheral side of the bent part 11c, a sufficient lip setting space can be secured. It is said that. Accordingly, it is possible to prevent the radial lip 6 from interfering with the ring member 11 and reduce the occupation space of the sealing device 1 by arranging the ring member 11 and the lip seal 2 close to each other.

  Since the bent portion 11c is also used as a radial direction positioning portion when the plurality of ring members 11 are stacked, it is possible to improve the handling workability of components.

  In addition, a protrusion 15 made of a rubber-like elastic body is provided on the other end face in the axial direction of the flat surface portion 11 a of the ring member 11, and when this protrusion 15 combines the ring member 11 with the lip seal 2, the lip seal 2. The labyrinth seal 16 is formed between the lip seal 2 and the lip seal 2 when the ring member 11 is pushed into the lip seal 2 and axially displaced. By contacting, it acts as a stopper that regulates the distance between the ring member 11 and the lip seal 2. Accordingly, the provision of such a projection 15 can improve the sealability of the portion, and when the ring member 11 is pushed into the lip seal 2 and displaced in the axial direction, the gap between the two 11 Thus, the side lip 5 can be prevented from being crushed.

  Also, a protrusion 7 made of a rubber-like elastic body is provided on one end surface in the axial direction of the lip seal 2, and this protrusion 7 is disposed close to the ring member 11 when the ring member 11 is combined with the lip seal 2. Thus, the labyrinth seal 8 is formed between the ring member 11 and the ring member 11. Accordingly, the provision of such protrusions 7 can further improve the sealability of the part.

  Next, a second embodiment of the present invention will be described with reference to FIG.

Second embodiment ...
In this embodiment, the lip support 18 is provided by the rubber-like elastic body 4 on the inner peripheral side of the mounting ring 3 in the lip seal 2, and the side lip 5 is integrally formed with the lip support 18 together with the radial lip 6. Accordingly, the inner diameter d ₂ of the mounting ring 3 is set larger than the diameter d ₁ of the base end portion of the side lip 5 (d ₁ <d ₂ ), and the lip is supported on the inner peripheral side of the mounting ring 3. A space 19 for installing other components is provided on the other side in the axial direction of the portion 18, and a rolling element (ball) 63 of the bearing is disposed close thereto. Therefore, by providing such a space portion 19, a limited space in the bearing can be effectively utilized. Since other configurations and operational effects are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

Sectional drawing which shows the principal part which shows the mounting state of the sealing device which concerns on 1st Example of this invention. Cross-sectional view of multiple ring members stacked Cross-sectional view showing a state in which a plurality of sealing devices are stacked and the ring member is pushed into the lip seal Cross-sectional view of multiple sealing devices stacked Sectional drawing which shows the principal part which shows the mounting state of the sealing device which concerns on 2nd Example of this invention. Sectional drawing of the principal part showing the mounting state of the sealing device according to the conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sealing device 2 Lip seal 3 Mounting ring 4 Rubber-like elastic body 5 Side lip 6 Radial lip 7, 9, 15 Protrusion 8, 16 Labyrinth seal 11 Ring member 11a Plane part 11b Attachment part 11c Bending part 12, 19 Space part 13 Magnetic Encoder 14 Sensor part 18 Lip support part 61 Bearing outer ring 62 Bearing inner ring 63 Bearing rolling element

Claims (7)

A sealing device comprising a combination of a lip seal attached to one of two members that rotate relative to each other and a ring member made of a rigid material such as a metal attached to the other member,
The lip seal has an attachment ring made of a rigid material such as a metal fitted to the one member, and a side lip and a radial lip formed by a rubber-like elastic body attached to the attachment ring,
The ring member is integrally formed from one side in the axial direction of the side lip so that the side lip is slidably in contact with the flat surface of the flange, and from the inner peripheral end of the flat portion toward the one axial direction. And a cylindrical mounting portion that is fitted to the other member,
The sealing device according to claim 1, wherein the radial lip of the lip seal is slidably in close contact with the peripheral surface of the other member. The sealing device according to claim 1.
A bent portion having a taper shape or a circular arc shape is provided at the inner peripheral end portion of the flat surface portion of the ring member, and the attachment portion is integrally formed through the bent portion, and on the inner peripheral side of the flat surface portion and the bent portion, A sealing device, wherein a space for preventing a radial lip of a lip seal from interfering with the ring member is provided. The sealing device according to claim 2.
When a plurality of ring members are stacked, a bent portion of the ring member above the mounting portion of one ring member is placed, and at this time, both ring members have a structure positioned in the radial direction. Sealing device. The sealing device according to claim 1.
A protrusion made of a rubber-like elastic body is provided on the other end face in the axial direction of the flat surface portion of the ring member, and the protrusion is disposed on the outer peripheral side of the side lip of the lip seal, and is connected to the lip seal. When the members are combined, a labyrinth seal is formed between the lip seal and the lip seal. When the ring member is pushed into the lip seal and axially displaced, the lip seal contacts the lip seal. Thus, the sealing device acts as a stopper for regulating the distance between the ring member and the lip seal. The sealing device according to claim 4.
A protrusion made of a rubber-like elastic body is provided on one end face in the axial direction of the lip seal, and the protrusion is disposed between the side lip of the lip seal and the protrusion provided on the ring member, A labyrinth seal is formed between the ring member and the ring member when the ring member is combined with the ring member. The sealing device according to claim 1.
A lip support portion made of a rubber-like elastic body is provided on the inner peripheral side of the mounting ring in the lip seal, and the side lip is integrally formed on the lip support portion, so that the diameter of the base end portion of the side lip is larger than that of the lip seal. The inner diameter of the mounting ring is set to be larger, and a space for installing other parts is provided on the inner circumferential side of the mounting ring and on the other side in the axial direction of the lip support part. Sealing device. The sealing device according to any one of claims 1 to 6,
A sealing device, wherein a magnetic encoder is attached to one end face in the axial direction of a flat surface portion of a ring member.

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