JP2017180576A - Sealing member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing member which can suppress the inversion of an auxiliary lip part at assembling.SOLUTION: A sealing member 1 for sealing an annular space between a rotating shaft 29 and a housing 30 surrounding the rotating shaft 29 comprises an annular core grid 2, and a seal member 3 fixed to the core grid 2. In the sealing member 1, the seal member 3 has a main lip part 11 which slide-contacts with an external peripheral face 29a of the rotating shaft 29, and prevents the leakage of a sealing fluid in an annular space to an outer side B, and an auxiliary lip part 12 which is arranged closer to the outer side B than the main lip part 11 via a space part 23, and extends while being inclined to the outer side B, whose tip 26 at its internal peripheral side has a fastening margin with respect to the rotating shaft 29, and which slide-contacts with the external peripheral face 29a of the rotating shaft 29. The core grid 2 is embedded in at least a base end part 12A of the auxiliary lip part 12 at a part of its internal peripheral side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sealing member.

In an automobile engine, a sealing member is used to prevent the lubricating oil from leaking from between a crank chamber and a front side end portion of a crankshaft penetrating the crank chamber (for example, Patent Documents). 1).
FIG. 2 is a cross-sectional explanatory view showing an example of a conventional sealing member used for the above-described application, and FIG. 3 is an enlarged cross-sectional view showing a state where the auxiliary lip portion of the sealing member shown in FIG. 2 is inverted. .
The sealing member 100 is attached to an annular space between the crank chamber housing 106 and a front side end portion (hereinafter also simply referred to as “shaft end portion”) 105 of the crankshaft S protruding from the housing 106. Thus, the lubricating oil in the crank chamber A is sealed from between the housing 106 and the shaft end portion 105 so as not to leak to the outside.
As shown in FIG. 2, the sealing member 100 includes a main lip portion 101 that slides on the outer peripheral surface of the shaft end portion 105 to seal the lubricating oil in the crank chamber A, and the main lip portion 101 extends to the outer side B of the crank chamber. And an auxiliary lip portion 102 that is inclined and extended toward the outer side B and prevents foreign matter from entering the crank chamber A.
In such a sealing member 100, in order to enhance the effect of preventing the entry of foreign matter by the auxiliary lip portion 102, the auxiliary lip portion 102 is provided with a tightening margin and is brought into contact with the shaft end portion 105.

JP 2008-25654 A

The above-described assembly of the sealing member 100 to the shaft end portion 105 may be performed by inserting the shaft end portion 105 from the outer side B (auxiliary lip portion 102 side) of the sealing member 100.
At this time, in the sealing member 100 in which the auxiliary lip portion 102 comes into contact with the shaft end portion 105 with a tightening margin, as shown in FIG. 3, when the shaft end portion 105 is inserted, the auxiliary lip portion 102 is placed in the crank chamber A. In some cases, it may be reversed to the side (main lip 101 side).
When the auxiliary lip portion 102 is reversed as described above, the sliding torque of the sealing member 100 increases when the crankshaft S rotates.
This invention is made | formed in view of such a situation, and it aims at providing the sealing member which can suppress that an auxiliary | assistant lip part inverts at the time of an assembly | attachment.

The sealing member of the present invention is a sealing member that seals an annular space between a rotating shaft and a housing that surrounds the rotating shaft,
An annular cored bar and a seal member fixed to the cored bar,
The seal member is in sliding contact with the outer peripheral surface of the rotating shaft to prevent the sealing fluid in the annular space from leaking to the outside, and the space portion on the outside side from the main lip portion. And an auxiliary lip portion that extends at an incline toward the outer side, has an inner circumferential end that has a margin for tightening with respect to the rotating shaft, and that is in sliding contact with the outer peripheral surface of the rotating shaft. And
A sealing member according to claim 1, wherein a part of the inner peripheral side of the core metal is embedded in at least a base end portion of the auxiliary lip portion.

  In the sealing member, since a part of the inner peripheral side of the cored bar is embedded in at least the base end portion of the auxiliary lip portion, the auxiliary lip portion has increased rigidity and is difficult to be deformed. Therefore, the sealing member can suppress the auxiliary lip portion from being reversed to the main lip portion side when the rotary shaft is inserted and assembled from the auxiliary lip portion side.

In the sealing member, the cored bar has a cylindrical portion fitted in the housing, and an annular plate portion extending radially inward from the cylindrical portion,
It is preferable that the annular plate portion has a bent portion that is bent in the radially inward direction in which the auxiliary lip portion extends, and at least a part of the bent portion is embedded in the auxiliary lip portion.
When such a metal core is employed, the metal core can be buried deeper toward the tip side of the auxiliary lip portion, which is suitable for increasing the rigidity of the auxiliary lip portion.

  According to the sealing member of this invention, it can suppress that an auxiliary | assistant lip part reverses at the time of an assembly | attachment.

It is a section explanatory view showing the important section of the sealing member concerning a 1st embodiment. It is sectional explanatory drawing which shows the principal part of the conventional sealing member. It is an expanded sectional view which shows the state which the auxiliary | assistant lip part of the sealing member shown in FIG. 2 reversed.

Hereinafter, a sealing member according to an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a cross-sectional explanatory view showing the main part of the sealing member according to the first embodiment.
The sealing member 1 according to this embodiment includes lubricating oil from between a crank chamber (not shown) of an automobile engine and a front end (shaft end) 29 of the crankshaft S penetrating the crank chamber. Is used to prevent leakage.
A crankshaft S as a rotating shaft is surrounded by the crank chamber and is rotatably supported in the crank chamber.
The sealing member 1 is configured in an annular shape, and is mounted in an annular space formed between the housing 30 provided in the crank chamber and the shaft end portion 29 of the crankshaft S. And the crank chamber are sealed.
Note that the sealing member 1 shown in FIG. 1 shows a natural state before deformation before being mounted between the outer peripheral surface 29 a of the shaft end portion 29 and the inner peripheral surface 30 a of the housing 30.

The sealing member 1 includes an annular core metal 2 having an L-shaped cross section, a seal member 3 fixed to the core metal 2, and an annular spring ring 4.
The cored bar 2 is an annular member made of metal (for example, SPCC), and a cylindrical part 6 fitted in the housing 30 and an annular plate bent inward in the radial direction from the outer side B end of the cylindrical part 6 Part 7. The annular plate portion 7 has a bent portion 7A on the radially inner side. The bent portion 7A is bent in a direction in which an auxiliary lip portion 12 described later extends.

The seal member 3 is made of an elastic material such as synthetic rubber (for example, acrylonitrile-butadiene rubber, acrylic rubber, fluorine rubber, etc.), and is fixed to the core metal 2 by adhesion or baking by vulcanization. The seal member 3 includes a main body portion 10, a main lip portion 11, an auxiliary lip portion 12, and a side lip portion 13.
The main body 10 is provided on the outer side of the cylindrical portion 6 of the core metal 2 and is fixed on the inner peripheral surface 30 a side of the housing 30 and the first main body 10 a provided on the outer side of the annular plate portion 7. 2 main body part 10b and the 3rd main body part 10c provided in the inner side of the annular board part 7.

The main lip portion 11 extends from the inner peripheral side of the third main body portion 10c to the shaft end portion 29 side and the crank chamber A side, and a peripheral groove 14 is formed on the outer peripheral surface thereof. A spring ring 4 called a so-called garter spring is attached to the circumferential groove 14 and fastens the main lip portion 11 inward in the radial direction.
The auxiliary lip portion 12 extends from the inner peripheral side of the second and third main body portions 10b, 10c to the shaft end portion 29 side and to the outer side B.
The side lip portion 13 extends substantially parallel to the axial direction from the second main body portion 10b to the outer side B. The side lip portion 13 suppresses foreign matter from approaching the crank chamber A.

  The main lip portion 11 of the seal member 3 is in contact with the outer peripheral surface 29a of the shaft end portion 29 with a margin to prevent the lubricating oil in the crank chamber A from leaking to the outside B. The main lip portion 11 has a tapered shape in which the thickness gradually decreases inward in the radial direction (the axial dimension decreases), and the cross-sectional shape thereof is substantially V-shaped, and the minimum diameter portion is the lip tip portion 19. It is said that. On the inner peripheral surface of the main lip portion 11, the surface on the outer side B with respect to the lip tip 19 is a first inclined surface 20, and the surface on the crank chamber A side with respect to the lip tip 19 is a second inclined surface 21. ing.

The auxiliary lip portion 12 of the seal member 3 is provided on the outer side B of the main lip portion 11 via the space portion 23. That is, an annular space 23 is formed between the inner peripheral surface (first inclined surface 24 described later) of the auxiliary lip portion 12 and the inner peripheral surface (first inclined surface 20) of the main lip portion 11.
In the seal member 3, a virtual surface X obtained by extending the first inclined surface 20, which is one of the inner peripheral surfaces of the main lip portion 11, to the outer side B is used as a boundary between the auxiliary lip portion 12 and the main body portion 10. A portion radially inward from the surface X is defined as an auxiliary lip portion 12.

  The auxiliary lip portion 12 is in contact with the outer peripheral surface 29a of the shaft end portion 29 with a margin to prevent foreign matter from entering the crank chamber A from the outer side B. On the inner peripheral side of the auxiliary lip portion 12, the first inclined surface 24 having a diameter-reduced shape from the third main body portion 10 c of the seal member 3 toward the distal end side is opposed to the minimum diameter portion of the first inclined surface 24. A second inclined surface 25 having a radially expanded shape is formed continuously outward in the radial direction, and the minimum diameter portion is the lip tip portion 26. That is, on the inner peripheral surface of the auxiliary lip portion 12, the surface closer to the crank chamber A than the lip tip portion 26 is the first inclined surface 24 having a contact surface (sliding contact surface) with the shaft end portion 29. A surface on the outer side B from the portion 26 is a second inclined surface 25.

In the sealing member 1, a part of the inner peripheral side of the core metal 2 is embedded in at least the base end portion 12 </ b> A of the auxiliary lip portion 12. Specifically, a part of the inner peripheral side of the annular plate part 7 including a part of the bent part 7 </ b> A of the annular plate part 7 is embedded in the auxiliary lip part 12.
As described above, a part of the core metal 2 is embedded in the auxiliary lip portion 12, thereby increasing the rigidity of the auxiliary lip portion 12. This is because the metal member (core metal 2) is embedded, and the outer peripheral surface 27 of the auxiliary lip portion 12 is more than the annular plate portion 7 in order to embed a part of the core metal 2. This is also because it is provided on the outer side in the axial direction, and the axial dimension of the base end portion 12A of the auxiliary lip portion 12 is thickened.
Since the auxiliary lip portion 12 having such increased rigidity is difficult to deform, the sealing member 1 is configured such that when the shaft end portion 29 is inserted from the outer side B and assembled, the auxiliary lip portion 12 is inverted. Can be suppressed.

The bent portion 7A is bent in the direction in which the auxiliary lip portion 12 extends. Therefore, in this embodiment, the cored bar 2 can be deeply embedded toward the distal end side of the auxiliary lip part 12, and the cored bar 2 is effectively exposed without being exposed on the surface of the auxiliary lip part 12. The rigidity of 12 can be increased.
According to such a sealing member of the present embodiment, it is possible to suppress the auxiliary lip portion 12 from being inverted during assembly.

(Other embodiments)
The present invention is not limited to the above-described embodiments, and can be appropriately changed within the scope described in the claims.
The sealing member according to the embodiment of the present invention is not limited to the one that seals between the crank chamber of the automobile engine and the end of the crankshaft protruding from the crank chamber, and the rotating shaft is inserted from the auxiliary lip side. It can be suitably used for applications in which the annular space between the rotating shaft and the surrounding housing is sealed.
The said sealing member can be used also as a side seal etc. of a differential gear, for example.

  1: sealing member, 2: cored bar, 3: sealing member, 6: cylindrical portion, 7: annular plate portion, 7A: bent portion, 11: main lip portion, 12: auxiliary lip portion, 13: side lip portion, 23 : Space portion, 24: First inclined surface, 25: Second inclined surface, 26: Lip tip, 27: Outer peripheral surface, 28: Projection, 29: Shaft end, 30: Housing, S: Crankshaft

Claims (2)

A sealing member that seals an annular space between a rotating shaft and a housing that surrounds the rotating shaft,
An annular cored bar, and a seal member fixed to the cored bar,
The seal member includes a main lip portion that is in sliding contact with the outer peripheral surface of the rotating shaft and prevents the sealing fluid in the annular space from leaking to the outside, and a space portion on the outside side of the main lip portion. And an auxiliary lip portion that extends obliquely toward the outer side, has an inner peripheral end that has a tightening margin with respect to the rotating shaft, and that is in sliding contact with the outer peripheral surface of the rotating shaft. And
A part of the inner peripheral side of the cored bar is embedded in at least a base end part of the auxiliary lip part. The cored bar has a cylindrical part fitted in the housing, and an annular plate part extending radially inward from the cylindrical part,
The annular plate portion has a bent portion that is bent in a direction in which the auxiliary lip portion extends on a radially inner side, and at least a part of the bent portion is embedded in the auxiliary lip portion. Sealing member.

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