JP2599517Y2 - Sealing device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device used for sealing, for example, between a differential carrier of a motor vehicle and a shaft.

[0002]

2. Description of the Related Art As a conventional sealing device of this type, for example, there is a sealing device as shown in FIG. That is, 10
Reference numeral 0 denotes a sealing device main body.
Is provided with an inward flange portion 102 on the inner peripheral side of the annular fitting portion 101, and a seal lip, that is, a flexible annular main seal lip 1 is provided on an inner peripheral end of the flange portion 102.
03 and an auxiliary seal lip 104 are provided. A dust lip 105 is provided on a side surface of the flange portion 102. The fitting portion 101, the flange portion 102, the main seal lip 103, and the sub-seal lip 104 are made of a rubber-like elastic body, and extend from the fitting portion 101 to the flange portion 102 as a metal ring as a rigid ring member having a substantially L-shaped cross section. 106 is embedded. A spring 107 is mounted on the back of the main seal lip 103.

[0003] The sealing device 100 configured as described above.
The fitting portion 101 of the rubber-like elastic body is previously fitted on the inner periphery of the shaft hole 109 of the differential carrier 108 as a member to be attached.
And the metal ring 106 is fitted and fixed.

[0004] The differential carrier 108
, A rotating shaft 110 is inserted into the sealing device 100 in the direction of arrow A from the outside. The rotating shaft 110 has a spline portion 111 formed on the distal end side in the insertion direction, and a straight portion 112 having a larger diameter than the spline portion 111.
And

The rotation shaft 110 stops at a predetermined insertion position,
The main seal lip 103 and the sub seal lip 104 come into contact with the straight portion 112 with a predetermined interference, and form a seal surface. The dust lip 105 contacts a not-shown outward flange portion or forms a sealing surface with a labyrinth.

[0006]

SUMMARY OF THE INVENTION Incidentally, the above-mentioned prior art includes: a. Due to the structure of the device, the rotating shaft 110 has a spline portion 111 at the tip. b. The assembly and insertion of the rotating shaft 110 are manually performed (and the rotating shaft 110 is heavy).

Therefore, a problem arises when the tip (spline portion 111) of the rotating shaft 110 passes through the main seal lip 103 and the sub seal lip 104.
Although the diameter of the shaft 1 is smaller than the diameter of the straight portion 112, the weight of the rotating shaft 110 is manually supported until the spline 111 engages with an engaging portion (not shown) of a mating spline portion. However, the main seal lip 103 and the auxiliary seal lip 104 interfere with the spline portion 111 easily causing shaft runout, and the main seal lip 103 and the auxiliary seal lip 104 are damaged or inverted.

The present invention has been made in order to solve the above-mentioned problems of the prior art.
It is an object of the present invention to provide a sealing device capable of preventing the seal lip from being damaged and inverted when the shaft is inserted.

[0009]

In order to achieve the above object, according to the present invention, a rigid ring member fitted to the inner periphery of a shaft hole of a member to be mounted, and a rigid ring member integrally formed with the rigid ring member. a sealing apparatus provided with an annular seal lip provided et Re flexibility in contact with the shaft, the rigid ring member, the cylindrical portion
Having an inward flange portion connected to the cylindrical portion,
Fixed to the inner circumference of the inward flange of the rigid ring member
Rubber-like elastic body, and fitted on the inner peripheral surface of the rubber-like elastic body.
That has a fitting portion, the insertion direction front side of the axis than the sealing lip, characterized by providing a protector having rigidity, a.

[0010]

In the sealing device having the above structure, when the shaft is inserted into the sealing device, the protector having rigidity provided at the inner end of the rigid ring member on the front side in the insertion direction of the shaft with respect to the seal lip when the shaft is inserted into the sealing device. Since the shaft runout is restricted, the seal lip and the tip of the shaft at the time of insertion hardly interfere with each other.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiment. In FIG. 1 showing a sealing device according to an embodiment of the present invention, reference numeral 1 denotes a sealing device main body, which is fitted and fixed in a shaft hole 3 of a differential carrier 2 as a member to be mounted. The sealing device 1 includes a metal ring 4 having an L-shaped cross section as a rigid ring member, and a metal ring 4 having a shaft hole 3.
And an annular seal body 5 made of a rubber-like elastic body and baked by vulcanization molding on the inner side surface.

The metal ring 4 is an annular cylindrical member having an inward flange portion 41, and an inner peripheral end of the flange portion 41 is bent to be shifted toward the atmosphere side A in the axial direction.

The seal body 5 includes a fitting portion 6 provided on the outer peripheral surface of the cylindrical portion 42 of the metal ring 4 fitted in the shaft hole 3, and a metal ring 4.
And a flexible annular seal lip 7 provided at the inner peripheral end of the flange portion 41, the inner peripheral surface of the cylindrical portion 42 of the metal ring 4, the atmosphere-side A end surface, the sealed fluid-side O end surface, and the inner surface of the flange portion 41. It has rubber-like elastic bodies 81, 82, 83 and 84 integrally fixed on the peripheral surface by baking. The seal lip 7 is inclined inside the shaft hole 3 of the metal ring 4, that is, upward in the drawing.
A spring 9 is mounted on the back surface of the seal lip 7.

The inner peripheral surface of the rubber-like elastic body 84, which is fixed by baking on the inner peripheral surface of the flange portion 41 of the metal ring 4, is a flat surface, the inner diameter of which is larger than the inner diameter of the seal lip 7, in the axial direction. A groove 85 having an arc-shaped cross section is provided at a predetermined interval in the axial direction from the end on the atmosphere side A. A metal protector 10 as a protector having rigidity is attached to the inner peripheral surface of the rubber-like elastic body 84.

The metal protector 10 includes a fitting portion 10C having an inner diameter larger than the inner diameter of the seal lip 7 fitted and fixed to the inner peripheral surface of the rubber-like elastic body 84, and an atmosphere side of the rubber-like elastic body 84. An outwardly facing flange portion 10B that is in close contact with the end face A, and a protruding portion 1 having an angle that increases in diameter from the outer peripheral end of the flange portion 10B toward the atmosphere side A in a conical shape.
0A. The fitting portion 10C has a predetermined width H in the axial direction, and has a rubber-like elastic body 8 at its tip.
4 is provided with an engaging portion 10D having an arcuate cross section which engages with a groove 85 having an arcuate cross section provided on the inner peripheral surface of the inner peripheral surface 4.

The fitting portion 10C of the metal protector 10 is fitted and fixed to the inner peripheral end of the flange portion 41 of the metal ring 4 via a rubber-like elastic body 84. That is, the engaging portion 10D engages with the groove 85, the fitting portion 10C fits on the inner peripheral surface of the rubber-like elastic body 84, and the flange portion 10B comes into close contact with the atmosphere-side A end surface of the rubber-like elastic body 84. Thus, it is integrally mounted on the side closer to the insertion of the rotary shaft 11 than the seal lip 7.

On the other hand, reference numeral 11 denotes a shaft inserted into the sealing device 1 in the direction of arrow B, that is, a rotating shaft, and a spline portion 12 and a straight portion 14 having a larger diameter than the spline portion 12 are sequentially arranged from the end in the insertion direction. It is formed.

Next, the operation of inserting the rotary shaft 11 into the sealing device 1 previously fitted into the shaft hole 3 of the differential carrier 2 will be described.

First, when the spline portion 12 is manually inserted into the sealing device 1 along the center of the rotating shaft 11, that is, along the axis, the flange portion of the metal ring 4 is inserted through the rubber-like elastic body 84. The weight of the rotating shaft 11 is supported by the straight portion 14 being hit by the inner circumferential surface of the metal protector 10 provided at the inner circumferential end of the metal protector 10 having the predetermined width H in the axial direction. And seal lip 7
Does not interfere with the spline portion 12 having a smaller diameter than the straight portion 14 and is not damaged or inverted.

When the rotating shaft 11 is further inserted, the inner diameter of the metal protector 10 is larger than the inner diameter of the seal lip 7. Contact and form a sealing surface.

In use, the spline portion 12 is engaged with an engagement portion (not shown) of the mating spline portion to support the own weight of the rotating shaft 11 (one side is supported by a mount or the like) and the seal lip is used. An appropriate finishing margin between the straight portion 7 and the straight portion 14 is maintained.

In the sealing device having the above-described structure, the rotating shaft 1 is located closer to the insertion direction of the rotating shaft 11 than the seal lip 7.
Since the metal protector 10 having the predetermined width H in the axial direction is provided integrally with the inner peripheral end of the flange portion 41 of the metal ring 4 via the rubber-like elastic body 84, the straight portion 14 of the rotating shaft 11 is provided. Abuts on the inner peripheral surface of the metal protector 10, the weight of the rotating shaft 11 is supported, and shaft runout is regulated. Therefore, the seal lip 7 does not interfere with the spline portion 12 and is not damaged or inverted. Further, the damage and reversal of the seal lip 7 can be prevented only by providing the metal protector 10 at the inner peripheral end of the flange portion 41 of the metal ring 4, so that the cost increase width can be suppressed as much as possible.

FIG. 3 shows another embodiment of the present invention. In the above embodiment, the metal protector 10 is provided at the inner peripheral end of the flange portion 41 of the metal ring 4 via a rubber-like elastic body 84 as a protector having rigidity. In this embodiment, the flange portion 41A of the metal ring 4 is provided. As a straight shape, a rubber-like elastic body 84A is baked and fixed on the inner peripheral surface thereof,
A fitting groove 86 of a protector having rigidity is formed on the inner peripheral surface thereof, and a resin protector 20 as a protector having rigidity is fitted and fixed in the fitting groove 86.

The resin protector 20 is a ring-shaped member having a predetermined width, the inner peripheral surface of which is flat, and the inner diameter of which is larger than the inner diameter of the seal lip 7.

At the end of the rubber-side elastic body 84A on the atmosphere side A, a dust lip 87 made of a rubber-like elastic body having an angle so as to continuously increase in diameter toward the atmosphere side A in a conical shape.
The dust lip 87 contacts the side surface of the flange portion 15 of the rotating shaft 11 to form a sealing surface, similarly to the protrusion 10A of the metal protector 10 of the first embodiment.

Since other structures and operations are the same as those of the first embodiment, the same components are denoted by the same reference numerals and description thereof will be omitted.

[0027]

The present invention has the above-described structure and operation, and a rigid protector is provided at a position closer to the shaft insertion direction than the seal lip at the inner end of the rigid ring member, so that the shaft is sealed. Shaft run-out is restricted during the work of inserting the device. Therefore, the seal lip does not easily interfere with the tip of the shaft at the time of insertion, and it is possible to prevent the seal lip from being scratched and inverted.

Further, by merely providing the protector at the inner end of the rigid ring member, it is possible to prevent the seal lip from being damaged and inverted, so that the cost increase can be minimized.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a sealing device according to an embodiment of the present invention, showing a state where a rotary shaft is being inserted.

FIG. 2 is a half sectional view showing a state where insertion of the sealing device of FIG. 1 into a rotating shaft is completed.

FIG. 3 is a half sectional view of a sealing device according to another embodiment of the present invention.

FIG. 4 is a half sectional view showing a conventional sealing device and showing a state where a rotary shaft is being inserted.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Sealing device 2 Differential carrier (attached member) 3 Shaft hole 4 Metal ring (rigid ring member) 41, 41A Flange part 42 Cylindrical part 5 Seal body 6 Fitting part 7 Seal lip 81, 82, 83, 84, 84A Rubber Elastic body 85 groove 86 fitting groove 87 dust lip 9 spring 10 metal protector (protector having rigidity) 10A projecting portion 10B flange portion 10C fitting portion 10D engaging portion 11 rotating shaft 12 spline portion 13 constriction portion 14 straight portion 15 Flange part 20 Protector made of resin (rigid protector)

Claims (1)

(57) [Scope of request for utility model registration] 1. A and the rigid ring member fitted into the inner periphery of the shaft hole of the mounting member, an annular sealing lip in flexible contact with the rigid ring member integrally with provided et Re axis <br/> Wherein the rigid ring member has a cylindrical portion and an inner portion connected to the cylindrical portion.
Oriented flange , fixed to the inner circumference of the inward flange of the rigid ring member
A rubber-like elastic body which is includes a fitting portion fitted to the inner peripheral surface of the rubber-like elastic body, the insertion direction front side of the axis than the seal lip, and protector having rigidity, the provided A sealing device.