JP2579497Y2 - 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 a crankshaft of an automobile engine, for example.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional sealing device 100. The sealing device 100 has a retainer 101 as a resin holding ring, and an oil seal 102 as a seal ring assembled on the inner peripheral side of the retainer 101. The retainer 101 has a cylindrical portion 103 and a flange portion 104,
A bolt is inserted into a bolt hole 105 provided in the flange portion 104 and fastened and fixed to an engine body 106.

[0003] The oil seal 102 is made of a reinforcing ring 10 made of resin.
7 and a seal body 10 joined to the inner peripheral side of the reinforcing ring 107
8 is provided. The seal body 108 is made of a rubber-like elastic body and has a seal lip 109.

[0004] The reinforcing ring 107 has a substantially L-shaped cross section.
The oil seal 102 and the retainer 101 are integrated by performing high frequency welding between the oil seal 102 and the inner peripheral surface 111 of the retainer 101. Reference numeral 112 denotes a gasket interposed between the engine main body 106 and the retainer 101, and 113 denotes a crankshaft in the engine main body 106.

With the above configuration, the seal lip 109 contacts the crankshaft 113 to form a sealing surface. The reason why both the retainer 101 and the reinforcing ring 107 are made of resin as described above is to realize a reduction in the weight of the sealing device 100.

[0006]

However, in the above-mentioned conventional example, since the retainer 101 and the reinforcing ring 107 are welded by high frequency welding, there are the following problems.

The retainer 101 and the oil seal 102
This complicates the assembling work and increases the manufacturing cost.

[0008] Retainer 101 and oil seal 102
Therefore, in order to replace the oil seal 102 due to wear of the seal lip 109 or the like, the retainer 101 must be replaced together, which increases an economic burden.

[0009] Both the retainer 101 and the reinforcing ring 107 must be made of a thermoplastic resin, which limits the usable resin materials.

[0010] Residual strain is generated in the welded portion due to heat, resulting in a decrease in strength.

Retainer 101 and oil seal 102
Cannot be disassembled, and is integrated with the rubber-like elastic body seal body 108. Accordingly, the resin material constituting the retainer 101 is prevented from being reused (recycled).

The present invention has been made to solve the above-mentioned problem, and is easy to assemble a holding ring and a seal ring, and can be freely attached and detached, and a resin material to be used is not limited. It is an object of the present invention to provide a sealing device capable of preventing a reduction in the strength of a ring or a reinforcing ring.

[0013]

In order to achieve the above object, the present invention comprises a resin holding ring and a seal ring to be assembled to the holding ring, wherein the seal ring is provided with a resin reinforcing ring. In the sealing device, the seal ring is configured to be detachable from the holding ring, and is elastically deformed to the holding ring or the reinforcing ring when the seal ring is attached or detached, and the attached seal ring is sandwiched and held together with the holding ring. Holding means is provided.

[0014]

According to the present invention based on the above configuration, the seal ring can be attached to and detached from the holding ring. When the seal ring is attached or detached, the holding means is elastically deformed, and the attached seal ring is held by the holding means.

[0015]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a half sectional view showing a case where the present invention is mounted on a crankshaft of an automobile engine. In the figure, A is a sealing device, and the sealing device A has a retainer 1 as a holding ring made of resin, and an oil seal B assembled on the inner peripheral side of the retainer 1. The retainer 1 is integrally formed of a thermoplastic resin such as PPS (polyphenylene sulfide).

The retainer 1 has a disk-shaped flange portion 21, and a guide portion extending radially through a connecting portion 2 inclined at a predetermined angle with respect to the axis D on the inner peripheral side of the flange portion 21. 3 is provided. The guide part 3 is substantially parallel to the flange part 21, and the guide part 3 has a shaft hole 7 centered on the axis D.

On the same circumference of the flange portion 21, an axis D
A plurality of bolt holes 20 are formed at regular intervals in the direction, and bolts 70 inserted into the bolt holes 20 are screwed into female threads of the engine body 71 and tightened to fix the retainer 1 to the end face of the engine body 71. It has become. A liquid or solid annular gasket 7 is provided between the flange end fixing surface 4 of the flange portion 21 and the engine body 71.
2 is attached.

On the inner peripheral side of the connecting portion 2, a cylindrical holding portion 5 extending substantially parallel to the axis D toward the flange end fixing surface 4 side.
Is provided. Details of the holding unit 5 will be described with reference to FIG.
On the inner peripheral side of the holding portion 5, an outer peripheral fixed sealing surface 9 substantially parallel to the axis D from the fixed end side to the free end side, a tapered groove surface 10, a parallel groove bottom surface 11, and a groove right angle end surface 12 are provided. It has a holding groove 73 configured and a stopper 74 as a holding means that projects annularly toward the inner peripheral side.

The seal guide surface 13 on the inner periphery of the stopper 74
Is set to be substantially the same as the diameter of the outer peripheral fixed seal surface 9, and the parallel groove bottom surface 11 is set to be larger than the seal guide surface 13 and the outer peripheral fixed seal surface 9. Guide 3
Has an end face fixed sealing surface 8 adjacent to the outer circumferential fixed sealing surface 9.

An annular relief groove 6 is formed between the connecting portion 2 and the free end side of the holding portion 5, and the holding portion 5 is configured to be elastically deformable outward with the fixed end side as a fulcrum. ing.

On the other hand, as shown in FIG. 3, the oil seal B is formed by joining a reinforcing ring 50 made of resin and a seal body 52 made of rubber-like elastic material. The reinforcing ring 50 may be selected from a thermoplastic resin such as PPS or a thermosetting resin such as phenol.

A projection 51 having a substantially wedge-shaped cross section is provided along the outer periphery of the reinforcing ring 50. On the outer periphery of the projection 51, a tapered surface 60, an outer peripheral surface 61 parallel to the axis D,
An end face 62 that is substantially orthogonal to the axis D is sequentially provided.

The tapered surface 60 of the projection 51 is set at an inclination angle substantially matching the tapered groove surface 10 of the holding portion 5, and the outer peripheral surface 61 of the projection 51 is set to have a diameter equal to or smaller than the parallel groove bottom surface 11. . The outer peripheral surface 61 is set to have a larger diameter than the seal guide surface 13. Further, the reinforcing ring 50 has an end face 6.
2, an annular flat surface 63 is formed. The flat surface 63 is set to have a diameter equal to or smaller than the seal guide surface 13.

The seal body 52 is joined from the middle part of the tapered surface 60 to the inner peripheral surface of the reinforcing ring 50, and a base 77 located on the end surface 76 side adjacent to the tapered surface 60.
And a main lip 54 and a sub lip 56 integrally formed on the inner peripheral side of the base 77 via the waist 53. A spring 55 is mounted on the back of the main lip 54. One of the inclined surfaces 78 forming the main lip 54 has a thread groove 5
7 is provided.

The outer peripheral surface of the base portion 77 is set to have substantially the same outer diameter as the outer peripheral fixed sealing surface 9, and a fixed sealing bead 59 is provided over the entire circumference. Further, fixed sealing beads 58a and 58b are formed on different circumferences on the end face of the base 77 opposite to the reinforcing ring 50.

In order to assemble the oil seal B having the above structure to the retainer A, the oil seal B and the retainer A are arranged concentrically as shown in FIG. Move toward A.

Then, the base 77 of the seal body 52 passes inside the seal guide surface 13, and the edge of the stopper 74 contacts the tapered surface 60 of the reinforcing ring 50.

When the oil seal B is further moved, the stopper 74, more specifically, the holding portion 5 is pushed by the tapered surface 60 and elastically deforms outward, so that the diameter of the seal guide surface 13 increases.
Next, the seal guide surface 1 of the outer peripheral surface 61 and the stopper 74
3 contacts.

When the projection 51 passes through the inside of the stopper 74 due to the movement of the oil seal B, the holding portion 5 returns to the state shown in FIG. 1 by the elastic restoring force, the diameter of the seal guide surface 13 is reduced, and the base portion is reduced. 77 is brought into close contact with the fixed sealing surface 8 to complete the assembly. At this time, the protrusion 51 is immersed in the holding groove 73, and the engagement of the stopper 74 and the protrusion 51 prevents the oil seal B from moving relative to the retainer 1 along the axis D. ing.

In the above-mentioned assembly completed state,
The fixed sealing bead 59 is in fluid tight contact with the outer peripheral fixed sealing surface 9, and the fixed sealing beads 58 a, 58 b are in fluid tight contact with the fixed sealing surface 8.

Thereafter, the sealing device A is mounted on the engine body 71, and the main lip 54 and the sub lip 56 contact the crankshaft 79 to seal the target liquid in the shaft hole 75.

In order to remove the oil seal B from the retainer 1, the stopper 74 is elastically deformed outward with respect to the holding portion 5 to release the engagement between the stopper 74 and the projection.
Only the oil seal B needs to be moved in the opposite direction to that described above.

As described above, in the present invention, the retainer 1 and the reinforcing ring 50 are made of resin and are lightweight. Then, the assembly of the oil seal B and the retainer 1 can be completed only by elastically deforming the stopper 74. Therefore, the assembling work is simplified, and the manufacturing cost can be reduced. Further, since the stopper 74 is elastically deformed, the press-fitting load at the time of assembly can be reduced, and the retainer 1 can be prevented from cracking.

The assembled oil seal B and the retainer 1 can be disassembled by the elastic deformation of the stopper 74. Therefore, when the main lip 54 and the sub lip 56 are worn, only the oil seal B can be removed from the retainer 1 and replaced, thereby reducing the economic burden.
Further, the resin material of the retainer 1 can be reused (recycled).

In order to maintain the assembled state by the engagement between the stopper 74 and the projection 51, the retainer 1, the reinforcing ring 5
0 The resin material used together can be freely selected. Furthermore,
There is no room for residual strain to occur in both the retainer 1 and the reinforcing ring 50, and the mechanical strength is improved.

In this embodiment, since the retainer 1 is formed of a thermoplastic resin, the oil seal B is prevented from being detached due to thermal expansion, vibration, and the like during use.

The reinforcing ring 50 of the oil seal B is suitable because it does not melt at high temperatures (200 to 300 ° C.) during vulcanization molding.

In this embodiment, the holding means is provided on the retainer side. However, a holding means which elastically deforms may be provided on the reinforcing ring side. Further, holding means may be provided on both the retainer and the reinforcing ring.

Furthermore, the sealing device of the present invention can be used not only for automobile engines but also for all industrial and household appliances such as pumps, construction machines, and agitators.

[0040]

[Effects of the Invention] Since the present invention is constructed as described above, the assembly of the seal ring and the holding ring can be completed only by elastically deforming the holding means. Therefore, the assembling work is simplified, and the manufacturing cost can be reduced.

The assembled seal ring and holding ring can be disassembled by elastic deformation of the holding means.
Therefore, only the seal ring can be replaced, and the economic burden is reduced. Further, the resin material of the retaining ring can be reused (recycled).

Since the assembled state is held by the elastically deforming holding means, the resin material used for both the holding ring and the reinforcing ring can be freely selected. Further, there is no room for residual strain to occur in both the retaining ring and the reinforcing ring, and the mechanical strength is improved.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing an embodiment in which the present invention is used for a crankshaft seal of an engine, in which a retainer and an oil seal are assembled.

FIG. 2 is a half sectional view showing only the retainer of FIG. 1;

FIG. 3 is a half sectional view showing only the oil seal of FIG. 1;

FIG. 4 is a half sectional view showing a process of assembling the oil seal and the retainer of FIG. 1;

FIG. 5 is a half sectional view of a conventional sealing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Retainer (holding ring) 2 Connecting part 3 Guide part 4 Flange end fixing surface 5 Holding part 6 Relief groove 7 Shaft hole 8 Fixed sealing surface 9 Outer peripheral fixed sealing surface 10 Tapered groove surface 11 Parallel groove bottom surface 12 Right angle end surface 13 Seal guide Surface 20 Bolt hole 21 Flange part 50 Reinforcement ring 51 Projection 52 Seal body 53 Waist part 54 Main lip 55 Spring 56 Secondary lip 57 Screw groove 58a, 58b, 59 Fixed sealing bead 60 Tapered surface 61 Outer peripheral surface 62 End surface 63 Flat surface 70 Bolt 71 Engine body 72 Gasket 73 Holding groove 74 Stopper (holding means) 75 Shaft hole 76 End face 77 Base 78 Inclined surface 79 Crankshaft A Sealing device B Oil seal D Shaft

Claims (1)

(57) [Scope of request for utility model registration] 1. A sealing device having a resin-made holding ring and a seal ring assembled to the holding ring, wherein the sealing ring is provided with a resin-made reinforcing ring. Configure freely,
When the seal ring is attached to or detached from the retaining ring or reinforcing ring, it is elastically deformed, and the attached seal ring is pinched together with the retaining ring.
A sealing device characterized by comprising a holding means for finding and holding.