JPH0712762Y2 - Sealing device - Google Patents

Description

TECHNICAL FIELD 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. 3 to 5.

The first conventional example shown in FIG. 4 is a so-called outer peripheral rubber type oil seal 100 with a spring, and the outer peripheral side is a housing 101.
A seal lip 102, which is fixedly fitted to the shaft, is sealingly contacted with the shaft 103 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 106 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. 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 an inward flange 109 arranged so as to face the outward flange 108. , And are integrally assembled.

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

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

First, for the first oil seal 100, the seal lip 1
There is a possibility that the sealing performance may be deteriorated due to the influence of the material and the surface roughness of the mating shaft 103 with which 02 is in sliding contact.

On the other hand, in the second unitized seal, since the main seal lip 107 does not come into direct contact with the shaft 103, there is no problem that the mating shaft 103 deteriorates the sealing performance.
Due to the eccentricity or the like, the sealing surface pressure between the main seal lip 107 and the sleeve 106 may become non-uniform, resulting in poor sealing or uneven wear.

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 11
Since 3 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, nonuniform sealing surface pressure does not occur, but the sealing surface pressure is equal to that of the rubber ring 111. Since it changes depending on the axial mounting position with respect to the slinger 112, it is necessary to have high accuracy in positioning which affects the sealing 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 Problems) In order to achieve the above object, in the present invention, a side surface portion extending in the axial direction and an end surface portion extending in the radial direction are fixed to a shaft and rotate together with the shaft. A slinger part having
A rubber ring fixed to the inner circumference of the housing and provided with a seal lip that comes into contact with the end surface of the slinger portion, and the inner circumference of the rubber ring and the side surface portion of the slinger portion are provided with engaging portions capable of engaging in concave and convex portions, A positioning end face that is flush with the end face of the rubber ring on the atmosphere side is provided at the end of the slinger part on the atmosphere side in the axial direction,
The engaging portion is held in a non-contact state at a regular assembly position.

(Operation) The sealing device having the above configuration is assembled in a state in which the rubber ring and the slinger portion are integrated at the engaging portion, and they are not separated before the mounting between the housing and the shaft. Therefore, it is not necessary to separately assemble the slinger portion and the rubber ring, which are separately stored, at the time of mounting.

Also, when mounting between the housing and shaft, the relative position of the rubber ring and slinger part can be positioned simply by mounting the atmosphere side end face of the rubber ring and the positioning end face of the slinger part in the same plane state. Done automatically,
The contact surface pressure between the seal lip and the slinger part is set to an appropriately large value.

Furthermore, in the state of being positioned at the regular position, the engagement portion between the rubber ring and the slinger portion is in a non-contact state,
The rotation torque during rotation does not increase.

(Example) Below, this invention is demonstrated based on the Example shown in figure. FIG. 1 shows the entire sealing device of the present invention with reference numeral 1. Sealing device 1
Has a slinger part 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, and in order to seal between the shaft 2 and the slinger part 3, for example, a lip (not shown) is provided on the sealing fluid side at the bending point of the end face part 4 and the side face part 5. Good. 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 thread grooves are provided on the atmosphere side of the end surface portion 4 of the slinger portion 3, and when the slinger portion 3 rotates, oil or the like is sent outward in the radial direction by a pumping action with a seal lip 13 of a rubber ring 8 described later. It may be configured as follows.

A caulking 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 atmosphere-side end surface of the caulked portion 10 serves as a positioning end surface 11, and is flush with the atmosphere-side end portion 12 of the rubber ring 8 at a regular assembly position.

On the other hand, a rubber ring 8 is concentrically arranged outside the slinger portion 3. Rubber ring 8 is the housing
It is fitted in 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.

The inner circumference of the rubber ring 8 and the side surface portion 5 of the slinger portion 3
An engaging portion 20 capable of engaging in concave and convex portions is provided on the.
That is, an annular projection 81 is formed on the inner circumference of the rubber ring 8 so as to project radially inward, and an engaging recess extending all around the inner circumference of the annular projection 81. 21 are provided. On the other hand, the side surface portion 5 of the slinger portion 3 is provided with an engagement convex portion 22 which can engage with the engagement concave portion 21. Here, the engaging concave portion 21 needs to be provided continuously over the entire circumference, but the engaging convex portion 22 does not necessarily have to be provided around the entire circumference, and may be provided partially. The engagement concave portion 21 and the engagement convex portion 22 are configured to hold the rubber ring 8 and the slinger portion 3 in a non-contact state at the regular assembly position.

That is, the cross-sectional shape of the engaging concave portion 21 is slightly larger than the cross-sectional shape of the engaging convex portion 22, and the gap 23 is formed when the relative position between the rubber ring 8 and the slinger portion 3 is a regular assembly position. ing. The relative position between the rubber ring 8 and the slinger part 3 is determined by determining the axial position and the radial position orthogonal to the axis. Of these, the relative position in the radial direction is automatically determined by mounting between the housing 13a and the shaft 2, and the inner diameter of the engaging concave portion 21 is made larger than the outer diameter of the engaging convex portion 22 so as to be non-contact. Just set it.

On the other hand, the relative position in the axial direction is determined by locating the atmospheric side end 12 of the rubber ring 8 and the positioning end face 10 of the slinger part 3 on the same plane as described above. The dimensional relationship is set so that the convex portion 22 does not interfere with the inner periphery of the engaging concave portion 21.

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. Also, rubber ring 8
Since the engaging portion 20 that is engaged through the slight clearance 23 is provided between the annular projection 81 and the slinger portion 3 on the inner circumference, the clearance 23 prevents dust from entering from the atmosphere side. It can also be sealed. Then, the engaging protrusion 22 and the engaging recess
Since it is not in contact with 21, and the sliding portion is only the contact portion between the seal lip 13 and the slinger portion 3, it is possible to suppress an increase in frictional resistance during rotational sliding.

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, the side surface portion 5 of the slinger portion 3 is inserted from the side having the seal lip 13 of the rubber ring 8 and the engagement convex portion 22 provided on the side surface portion 5 is provided on the rubber ring 8. The engaging recess 21 and then the side surface 5
Assemble integrally by crimping the edge of. That is, when the side surface portion 5 is inserted into the inner circumference of the rubber ring 8,
The engaging projection 22 abuts on the annular projection 81 of the rubber ring 8 having rubber-like elasticity, but by further pushing, the abutting portion of the annular projection 81 is elastically deformed and the engaging projection 22 becomes the engaging recess.
It reaches 21 and is assembled as one.

Here, the crimping portion 10 at the end edge of the slinger portion 3 may be molded after being integrally assembled, or preliminarily molded and crimped by utilizing the elastic deformation of the annular projection 81. The configuration may be such that the section 10 gets over it.

Next, the sealing device 1 assembled in this manner is attached to the housing 13a.
Explaining the work of mounting between the shaft 2 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 atmospheric side end portion 12 of the rubber ring 8 are flush with each other, and are pushed into the hole portion 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 surface pressure between the seal lip 13 of the rubber ring 8 and the end surface of the slinger portion 3 is maintained at an appropriate pressure,
No seal failure due to insufficient surface pressure or increase in rotational torque due to excessive surface pressure. The seal between the slinger portion 3 and the shaft 2 is performed by a sleeve seal lip or the like.

FIG. 2 shows another embodiment of the present invention. In this example, the caulking portion 10 of the slinger portion 3 is bent inward in the radial direction, and is engaged with the end surface 2a of the shaft 2 to seal the sealing device 1.
The entire positioning can be achieved. Since other configurations and operations are the same as those of the above-described embodiment, the same components are designated by the same reference numerals and the description thereof will be omitted.

Although the caulking portion 10 forming the positioning end surface 11 is shown only inward or outward in each of the above-described embodiments, it is possible to partially form both inward and outward caulking portions. May be.

(Effects of the Invention) The present invention has the above-described configuration and operation. Since the slinger portion and the rubber ring are provided with engaging portions capable of engaging in concave and convex portions to be integrated with each other, the device can be integrated with the housing. Since it is sufficient to integrally mount it between the shafts, assembly workability is improved.

Also, the slinger part is provided with a positioning end face that is flush with the atmospheric side end face of the rubber ring at the proper mounting position, so that the relative position between the slinger part and the rubber ring can be easily positioned. Therefore, the seal surface pressure of the seal lip that contacts the end surface portion can be easily set to an appropriate value.

Further, since the engaging portion is held in the non-contact state in the regular assembling apparatus state, the increase in the rotating torque can be suppressed as small as possible.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the sealing device of the present invention,
FIG. 2 is a vertical sectional view of a sealing device according to another embodiment of the present invention, and FIGS. 3 to 5 are vertical 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, 8 ... Rubber ring 10 ... Crimping part, 12 ... End part 13 ... Seal lip, 13a ... Housing 14 ... Reinforcement ring , 17 ... hole 20 ... engaging part, 21 ... engaging concave part 22 ... engaging convex part, 23 ... gap 81 ... annular protrusion

Claims (1)

[Scope of utility model registration request] 1. A slinger, which is fixed to a shaft and rotates together with the shaft, has a slinger part having a side surface extending in the axial direction and an end surface extending in the radial direction, and contacts the end surface of the slinger part fixed to the inner circumference of the housing. A rubber ring provided with a seal lip, and an engaging portion capable of engaging in concave and convex portions on the inner circumference of the rubber ring and the side surface of the slinger portion, and a regular assembly at the end of the slinger portion on the atmospheric side in the axial direction. A sealing device, wherein a positioning end face that is flush with the atmosphere-side end face of the rubber ring is provided at a mounting position, and the engaging portion is held in a non-contact state at a regular mounting position.