JP2518289Y2 - Sealing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a sealing device, and more particularly to a sealing device that facilitates assembly work and alignment work.

(Prior Art) As a conventional sealing device of this type, there is, for example, one shown in FIGS. 4 to 6.

The first conventional example shown in FIG. 4 is a so-called outer peripheral rubber type oil seal 100 with a spring, the outer peripheral side of which is the housing 1
A seal lip 102, which is fitted and fixed to 01 and which is in sealing contact with the shaft 103, is provided on the inner peripheral side.

A second conventional example shown in FIG. 5 is a so-called unitized seal 104, which includes a seal body 105 fitted and fixed to the housing 101 and a sleeve 10 fitted to the outer periphery of the shaft 103.
A seal lip 107 provided on the inner circumference of the seal body 105 is slidably and sealingly contacted with the outer circumference of the sleeve 106. Further, an outward flange 108 extending outward in the radial direction is provided at the end of the sleeve 106 on the atmosphere side, while the seal body 105 is provided with the outward flange 108.
The inwardly facing flange 109 is provided so as to be opposed to and is integrally assembled.

A third conventional example shown in FIG. 6 is a so-called end face seal 110, in which end faces of a rubber ring 111 fitted on the inner circumference of the housing 101 and a slinger 112 fixed to a shaft 103 are axially opposed to each other. The rubber ring 111 is provided with a sealing lip 113 for sealingly contacting the end face of the slinger 112.

(Problems to be Solved by the Invention) However, in the case of the above-described conventional technique, there are the following problems.

First, in the first oil seal 100, there is a possibility that the sealing performance will be affected by the material and surface roughness of the mating shaft 103 with which the seal lip 102 is in sliding contact.

On the other hand, in the second unitized seal, since the main seal lip 107 does not directly contact the shaft 103,
Although there is no problem of deterioration of sealing performance due to mating shaft 103, shaft 1
Due to the eccentricity of 03, the sealing surface pressure between the main seal lip 107 and the sleeve 106 becomes non-uniform, and there is a possibility that defective sealing or uneven wear may occur.

Further, since there are many contact portions between the sleeve 106 and the lip 107, high torque is generated and heat is easily generated, it is not suitable for high rotation.

Further, in the third conventional example, the main seal lip
Since 113 is in contact with the end surface of the slinger 112,
It is not affected by the mating shaft, and even if the shaft 103 is eccentric, uneven sealing surface pressure does not occur, but since the sealing surface pressure changes depending on the axial mounting position of the rubber ring 111 and the slinger 112, Precision is required for positioning that affects performance.

Further, since the slinger 112 and the rubber ring 111 are separately configured, the mounting work must be performed one by one, which causes a problem of poor workability.

The present invention was made in order to solve the above-mentioned problems of the prior art, and its purpose is to provide an end face seal type that is not affected by the mating shaft, which facilitates assembly work and alignment work. Moreover, it is an object of the present invention to provide a sealing device that can minimize the sliding portion.

(Means for Solving the Problem) In order to achieve the above-mentioned object, in the present invention, a side surface part that rotates integrally with a shaft and has a substantially cylindrical shape, and an axial direction outward from one axial end of the side surface part In a sealing device having a slinger portion having an end surface portion extending to the inner surface of the housing, and a rubber ring having a seal lip fixed to the inner circumference of the housing and contacting the end surface portion of the slinger portion, a circumferential portion is provided on the inner circumference of the rubber ring. Is provided with a retaining protrusion that extends radially inward, and a stopper portion that extends in the radial direction and engages with the retaining protrusion is provided at the other axial end of the side surface of the slinger portion. The slinger portion and the rubber ring are configured to be separable or connectable by providing a notch formed in the stopper portion so that the slip-out preventing projection can pass in the axial direction. The notch of the curved portion is characterized in that the notched portion is bent inward in the radial direction and an inward caulking portion is provided.

Further, it is desirable that the stopper-side end face of the rubber ring is flush with the slinger part-rubber ring at the proper mounting position.

(Operation) Thus, according to the sealing device of the present invention, since the retaining projection provided on the rubber ring is provided at the end of the slinger portion on the atmospheric side in the axial direction, the stopper portion is engageable in the axial direction. The part and the rubber ring can be assembled between the housing and the shaft in an integrated state. Therefore, it is not necessary to individually assemble the slinger portion and the rubber ring, which are stored separately at the time of assembly.

Further, in assembling the slinger portion and the rubber ring, the side surface portion of the slinger portion is inserted from the end surface side having the seal lip of the rubber ring. At that time, the slinger portion and the rubber ring are relatively rotated so that the stopper portion does not interfere with the stopper projection, and the stopper portion is inserted until the stopper portion is located on the atmospheric side in the axial direction with respect to the stopper projection. Then, the slinger portion and the rubber ring are relatively rotated to engage the retaining projection with the stopper portion to prevent the retaining.

Further, when providing the retaining projection and the stopper portion, which are portions for connecting the slinger portion and the rubber ring, the retaining protrusion is formed by vulcanizing and adhering rubber to the reinforcing ring, and the stopper portion of the slinger portion is formed. The end surface portion is formed by caulking the opposite side in the axial direction. Therefore, since each coupling means is processed in a state where the slinger portion and the rubber ring are not coupled, it is possible to perform processing without giving a force to caulk the stopper portion of the slinger portion to the rubber ring. Damage is avoided and the work becomes efficient by processing each part individually.

Further, when one of the slinger portion and the rubber ring needs to be replaced due to damage or the like, only one of them can be replaced without breaking the other member.

Furthermore, the crimping portion allows the slinger to be reliably positioned.

After mounting between the housing and the shaft, the retaining projection and the side surface of the slinger portion are in non-contact with each other, so that the rotational torque during rotation is small.

Furthermore, if the atmosphere side end surfaces of the slinger portion and the stopper portion are made flush with each other, when the slinger portion and the rubber ring are assembled and then the assembly is mounted between the housing and the shaft,
By mounting the rubber ring and the stopper portion on the atmosphere side end faces in the same plane, the relative positions of the rubber ring and the slinger portion in the axial direction are automatically positioned.

(Embodiment) Hereinafter, the present invention will be described based on an illustrated embodiment.
1 and 2 show the sealing device of the present invention as a whole by 1. The sealing device 1 has a slinger portion 3 fixed to the shaft 2 and rotating with the shaft 2. The slinger portion 3 has an annular shape as a whole and has an end surface portion 4 extending in the radial direction and a side surface portion 5 extending in the axial direction. The slinger part 3 is fixed to the shaft 2, but in order to seal between the shaft 2 and the slinger part 3, the slinger part 3 is baked and formed on the sealing fluid side, that is, the oil side of the bending point of the end face part 4 and the side face part 5. A sleeve sealing lip 6 is provided. Further, the side surface portion 5 of the slinger portion 3 and the shaft 2 are in direct contact with each other without interposing rubber between them.

Further, several threads are provided on the atmosphere side of the end surface portion 4 of the slinger portion 3 so that oil and the like can be sent outward in the radial direction by a pump action with a seal lip 13 of a rubber ring 8 described later when the slinger portion 3 rotates. You may comprise.

A stopper portion 10 is provided at the end of the slinger portion 3 on the atmosphere side, and is bent outward in the radial direction. The end surface 11 of the stopper portion 10 and the atmosphere-side end portion 12 of the rubber ring 8 are flush with each other at the regular assembly position.

The stopper portion 10 is partially stoppered by caulking an end of the side surface portion 5 of the slinger portion 3 on the atmosphere side outward in the radial direction, and partially forming a notch 21 at the tip end of the caulking portion 20. The part 10 is formed. This notch 21 is 1
It may be provided at a plurality of locations or at a plurality of locations.

On the other hand, a rubber ring 8 is arranged outside the slinger portion 3 in the radial direction. The rubber ring 8 is fitted in the housing 13a and has a metal reinforcing ring 14 inside.
The rubber ring 8 is formed with a seal lip 13 which is in sliding contact with the end surface portion of the slinger portion 3 to seal oil leakage.

Further, on the inner peripheral side of the rubber ring 8, there is provided a retaining projection 16 capable of engaging with the stopper portion 10 of the slinger portion 3 in the axial direction. This retaining projection 16
Is partially provided in the circumferential direction so as to correspond to the stopper portion 10 provided in the slinger portion 3 described above, and the stopper portion 10 and the retaining portion 10 can be prevented from coming off depending on the relative rotational position of the rubber ring 8 and the slinger portion 3. The projection 16 is adapted to be selectively engaged. That is, the retaining projection 16 is configured to freely pass through the notch 21 provided in the slinger portion 3. When the position of the retaining projection 16 overlaps with the notch 21 ... Position, the rubber ring 8 and the slinger are The part 3 and the part 3 are separated from each other in the axial direction. The number of the retaining projections 16 may be one or more, as long as they can be removed through the notches 21.

The retaining projection 16 extends obliquely toward the atmosphere side in the axial direction, and the tip of the protrusion 16 is not in contact with the side surface portion 5 with a small gap g.

In the sealing device 1 configured as described above, the slinger part 3 is rotated by the rotation of the shaft 2, and the seal lip 13 seals oil and the like. Further, since there is no rubber interposed between the slinger portion 3 and the shaft 2, the side surface portion 5 of the slinger portion 3 and the shaft 2 are in direct contact with each other, so that heat dissipation is good.

When assembling this sealing device 1, a rubber ring 8
The side surface portion 5 of the slinger portion 3 is inserted from the end surface side having the seal lip 13 of FIG. At this time, the rubber ring 8 and the slinger portion 3 are relatively rotated so that the retaining projection 16 is aligned with the position of the notch 21 of the slinger portion 3. After that, when the retaining protrusion 16 passes through the notch 21, the rubber ring 8 and the slinger portion 3 are again displaced in the rotational direction, and the retaining protrusion 16 is engaged with the stopper portion 20. The seal lip of the rubber ring 8 when assembled in this way
13 contacts the end surface portion 5 of the slinger portion 3, the elastic force of which pushes the rubber ring 8 in the axial direction, and the retaining projection 16 is held in contact with the stopper portion 20. Therefore, there is no risk of accidental rotation and disengagement.

Next, the sealing device 1 assembled in this manner is attached to the housing 13
Explaining the work of mounting between a and the shaft 2, the assembly is pushed into the hole 17 of the housing 13a using a jig or the like. At that time, the end surface 11 of the slinger portion 3 and the end portion 12 of the rubber ring 8 on the atmosphere side are flush with each other, and are pushed into the holes 17 while maintaining the flush state by a jig or the like. When the assembly is pushed in this way, the relative position between the rubber ring 8 and the slinger portion 3 is accurately maintained, and the relative position between the rubber ring 8 and the slinger portion 3 does not shift. Therefore, the seal lip 13 of the rubber ring 8
The surface pressure of the seal between the slinger portion 3 and the end surface of the slinger part 3 is maintained at an appropriate pressure, and the rotational torque does not increase due to insufficient sealing due to insufficient surface pressure or excessive surface pressure.

Further, as shown in FIG. 3, if the notched portion of the slinger portion 3 in the above-described embodiment is bent inward in the radial direction and the inward caulking portion 22, ... Two
The entire device 1 can be positioned in the axial direction by hooking the end face of the device.

(Effects of the Invention) The present invention has the above-described configuration and operation, and the side surface of the slinger portion is provided with the stopper portion which can be engaged with the retaining projection provided on the rubber ring so that the slinger portion is integrally assembled. Therefore, when the device is mounted between the housing and the shaft, it is sufficient to mount it integrally, and the workability of assembling is improved.

In addition, the retaining protrusion and the stopper portion are partially provided, and the rubber ring and the slinger portion are relatively rotated to selectively engage with each other, so that the retaining protrusion (lip)
It can be attached and detached without curling or being damaged, and the work of assembling and removing the rubber ring and the slinger portion can be easily performed. Also, replacement can be done individually for each part, which greatly improves operability.

Further, since the retaining projection is held in a state of being in non-contact with the side surface portion of the slinger portion, it is possible to suppress the increase of the rotational torque and the like as small as possible.

Also, since it is possible to process without giving the rubber ring the force to crimp the stopper part of the slinger part,
The rubber ring can be prevented from being damaged, and the work can be made efficient by processing each component individually.

Further, when one of the slinger portion and the rubber ring needs to be replaced due to damage or the like, only one of them can be replaced without breaking the other member. Further, the slinger can easily perform the slinger positioning work, and the sealing surface pressure of the seal lip that contacts the end surface portion can be easily set to an appropriate size.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing an embodiment of the sealing device of the present invention, FIG. 2 is a vertical sectional view of the device of FIG. 1, and FIG. 3 is a portion of a sealing device according to another embodiment of the present invention. A perspective view and FIGS. 4 to 6 are longitudinal sectional views showing a conventional sealing device. DESCRIPTION OF SYMBOLS 1 ... Sealing device, 2 ... Shaft 3 ... Slinger part, 4 ... End face part 5 ... Side part 6 ... Sleeve seal lip 8 ... Rubber ring, 10 ... Stopper part 12 ... End part, 13 ... Seal lip 13a ... Housing, 14 ... Reinforcement ring 16 ... Retaining protrusion 17 ... Hole, 20 ... Crimped part 21 ... Notch, 22 ... Crimped part g ... Gap

Claims (2)

(57) [Scope of utility model registration request] 1. A side surface part (5) having a substantially cylindrical shape that rotates integrally with a shaft (2) and an end surface part (4) extending radially outward from one axial end of the side surface part (5). A sealing device having a slinger part (3) and a rubber ring (8) fixed to the inner circumference of the housing and having a seal lip (13) contacting the end face part (4) of the slinger part (3), Provided on the inner circumference of the rubber ring (8) is a retaining projection (16) extending partially inward in the radial direction. The slinger portion (3) is provided at the other end in the axial direction with the side surface portion (5) in the radial direction. Is provided with a stopper portion (10) that engages with the retaining protrusion (16), and the retaining protrusion (16) is formed in the stopper portion (10) so as to pass in the axial direction. By providing the notch (21), the slinger part (3) and the rubber ring (8 DOO sealing device, characterized in that the separated or coupled freely configured. 2. The notch (2) of the slinger part (3)
The sealing device according to claim 1, wherein 1) is provided with an inward crimping portion (22) by bending the notched portion inward in the radial direction.