JPH0810712Y2 - Sealing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to a sealing device, and more particularly to a sealing device having excellent sealing performance.

[Prior art and its problems]

Generally, a sealing device which is provided between a rotary member such as a crankshaft and a fixed member such as an engine main body which supports the rotary member to seal between the two is shown in FIG. It is configured as shown.

That is, the sealing device shown in FIG. 2 has a retainer 21 attached to a fixing member (not shown) via a gasket 25.
And an oil seal 23 fitted and attached to the inner peripheral surface 22 of the retainer 21, and the lip portion 24 of the inner peripheral surface of the oil seal 23 is brought into contact with the outer peripheral surface of the rotating member (not shown). The rotary member is thereby sealed, and the gasket 25 is interposed between the fixed member and the retainer 21 to seal the fixed member.

However, in the conventional sealing device configured as described above, by attaching the retainer 21 to the fixing member with the bolt with the gasket 25 interposed between the retainer 21 and the fixing member, Since the space between them has been sealed, if the tightening force of the bolt is uneven, or if the tightening force is insufficient, it is not possible to completely seal the two and leakage will occur. Had the problem.

The present invention solves the above-mentioned problems with the conventional ones, and can always obtain excellent sealing performance without being affected by the tightened state of the bolts and completely prevent the occurrence of leakage. It is an object of the present invention to provide a sealing device that can be used.

[Means for solving problems]

In order to solve the above problems, the present invention is a sealing device for sealing between a fixing member such as an engine body and a rotating member such as a crankshaft, the sealing device being attached to the fixing member. A flange portion whose peripheral portion is formed in a tapered surface inclined toward the fixing member side, a cylindrical portion integrally provided inside the flange portion, and an axial direction of the cylindrical portion opposite to the flange portion. A reinforcing member having a protrusion extending radially inward from an end is provided, the protrusion is integrally provided with an annular lip portion that is in sliding contact with the rotating member, and the material forming the lip portion is used to form the lip portion. By covering the inner peripheral surface of the cylindrical portion and the entire surface of the flange portion on the fixing member side, and forming a tapered surface on the fixing member side in a portion corresponding to the peripheral edge of the flange portion, It is obtained by employing a means provided with a gasket surface on flange portion periphery.

[Action]

By adopting the above-mentioned means, the present invention seals the gap between the rotary member and the rotary member by the lip portion of the oil seal provided on the inner surface of the reinforcing member, and the gap between the fixed member and the gasket surface of the oil seal. Is sealed by contacting the fixing member, and the flange portion of the reinforcing member is formed into a tapered surface, so that the gasket surface is pressed by the fixing member.

〔Example〕

Hereinafter, an embodiment of the present invention shown in the drawings will be described.

FIG. 1 shows an embodiment of a sealing device according to the present invention. The sealing device includes a reinforcing member 1 attached to a fixing member (not shown) such as an engine body and the reinforcing member 1 integrally. The oil seal 6 is provided and seals between the fixed member and a rotating member such as a crankshaft.

The reinforcing member 1 includes a flange portion 2 for attaching to the fixing member, a cylindrical portion 3 integrally provided inside the flange portion 2, and a radially inner portion integrally provided at an end portion of the cylindrical portion 3. The flange portion 2 is formed with a tapered surface, and the inside of the tapered surface has a protruding portion 4 for protruding bolts at predetermined intervals. Holes 5, 5, ... Are drilled.

The oil seal 6 is routed from the protrusion 14 on the inner surface side of the reinforcing member 1 to the cylindrical portion 3 and the flange portion 2. Therefore, the inner surface of the reinforcing member 1 is completely covered by the oil seal 6. It is like this.

Further, an annular lip portion 7 is formed inside the protruding portion 4 of the oil seal 6 to seal the gap with the rotating member, and a gasket that seals between the fixing member and the peripheral portion of the flange portion 2. A surface 8 is formed.

Further, a spring 10 for pressing the lip portion 7 against the outer peripheral surface of the rotating member is provided on the outer peripheral surface of the lip portion 7, and the flange portion 2 of the reinforcing member 1 is further provided.
.. are also formed in portions corresponding to the bolt holes 5, 5 ,.

In this case, the portion of the reinforcing member 1 corresponding to the tapered surface of the flange portion 2 is formed into a tapered surface having an angle substantially equal to the taper angle.

In order to seal between the fixed member such as the engine body and the rotating member such as the crankshaft using the sealing device configured as described above, first, the oil seal 6 is used.
Of the oil seal 6 is brought into contact with the fixed member, and in this state, the bolt holes 5 and 5 of the reinforcing member 1 and the oil Bolt holes 9, 9 for the seal 6
The bolt is fastened to the fixing member via the ... And the reinforcing member 1 and the oil seal 6 on the inner surface side thereof are attached to the fixing member.

In this case, since the peripheral portion of the flange portion 2 of the reinforcing member 1 is formed into a tapered surface, when the reinforcing member 1 is attached to the fixing member with a bolt, the spring force of the tapered surface is provided on the inner surface of the reinforcing member 1. Therefore, the gasket surface 8 of the oil seal 6 is acted on, and thus the gasket surface 8 of the oil seal 6 is strongly pressed to the fixed member side.

Therefore, when the reinforcing member 1 is attached to the fixing member, even if the tightening force of the bolt is uneven or the tightening force is insufficient, the oil seal 6 provided on the inner surface of the reinforcing member 1 is The gasket surface 8 is constantly pressed against the fixing member by the spring force of the taper surface of the flange portion 2 of the reinforcing member 1, and thus the gap between the gasket surface 8 and the fixing member can be reliably sealed.

Further, since the oil seal 6 is provided so as to cover the surface of the reinforcing member 1 on the side of the fixed member, when the oil seal 6 is attached to the fixed member, the reinforcing member 1 is protected by the oil seal 6 from gas and the like in the fixed member. Therefore, the reinforcing member 1 can be completely prevented from being corroded, so that the reinforcing member 1 can be prevented from being corroded and the durability can be improved.

The reinforcing member 1 may be heat-treated to further increase the spring force of the tapered surface of the flange portion 2 to further increase the pressing force of the oil seal 6 against the fixing member.

[Effect of device]

Since the sealing device according to the present invention is configured as described above, the gasket surface provided on the surface of the reinforcing member on the fixing member side is fixed by tightening the flange portion of the reinforcing member to the fixing member side with bolts or the like. The member comes into contact with and seals with the member side, and the lip portion comes into contact with the outer peripheral surface of the rotary member and seals with it.

In this case, since the peripheral edge of the flange portion of the holding member is formed into a tapered surface, when the flange portion is tightened to the fixing member side with a bolt or the like, the tightening force of the bolt and the spring force of the tapered surface of the flange portion By the cooperation of the above, the gasket surface can be strongly pressed to the fixing member side. Therefore, even if the tightening force by the bolts or the like is non-uniform or the tightening force is insufficient, the gasket surface can be strongly pressed to the fixing member side over the entire circumference, so that the gap between the fixing member and Can be surely sealed,
The sealed state can be maintained for a long time.

Further, the sealing device according to the present invention has a simple structure in which the inner peripheral surface of the cylindrical portion of the reinforcing member and the entire surface of the flange portion on the side of the fixing member are covered with the material forming the lip portion, and therefore, the sealing device is manufactured. It can be remarkably facilitated and an inexpensive product can be provided.

Further, since the inner peripheral surface of the cylindrical portion of the reinforcing member and the entire surface of the fixing member side of the flange portion are covered with the material forming the lip portion, the entire reinforcing member can be formed by only performing corrosion resistance treatment on only a part thereof. Corrosion resistance can be improved, overall durability can be significantly improved, and an economically advantageous product can be provided, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a sectional view showing a sealing device according to the present invention, and FIG. 2 is a sectional view showing a conventional sealing device. 1 ... Reinforcement member 2 ... Flange part 3 ... Cylindrical part 4 ... Projection part 5, 9 ... Hole 6, 23 ... Oil seal 7, 24 ... Lip part 8 ... Gasket surface 10 ... Spring 21 …… Retainer 22 …… Inner peripheral surface 25 …… Gasket

Claims (1)

[Scope of utility model registration request] 1. A sealing device for sealing between a fixed member such as an engine body and a rotating member such as a crankshaft,
The sealing device is attached to the fixing member and has a flange portion (2) whose peripheral portion is formed in a tapered surface inclined toward the fixing member side, and is integrally formed inside the flange portion (2). A reinforcing member (1) having a cylindrical portion (3) provided and a protrusion (4) extending radially inward from an axial end of the cylindrical portion (3) opposite to the flange portion (2). And an annular lip portion (7) slidably contacting the rotating member is integrally provided on the protrusion portion (4), and the inside of the cylindrical portion (3) is made of a material forming the lip portion (7). By covering the peripheral surface and the entire surface of the flange portion (2) on the fixing member side, and forming a tapered surface on the fixing member side at a portion corresponding to the peripheral edge of the flange portion, the flange portion (2 ) Gasket surface (8) is provided on the periphery Sealing device according to claim and.