JPH0746840Y2 - Combination seal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial field] The present invention relates to a sealing material for sealing between mutually rotatable members, and more specifically, an integral type combination seal that produces a sealing force in a pair. It is about.

[Prior Art] Conventionally, most of the integrated oil seals that are combined and have a sealing action have been developed for use in a severe place where a single seal cannot satisfy, and therefore various shapes are required.・ Materials have been tried and implemented.

Among them, the one using a fluororesin material for the seal lip has been developed as a means for further reducing the sliding torque, and a significant improvement in sealing force and a reduction in torque have been achieved.

An example of this will be described with reference to the drawings.
As disclosed in Japanese Patent No. 7160, a sealing structure has been proposed in which a retaining ring (7) to which a seal lip (22) made of a fluororesin material is attached and a flinger (4) with which the seal lip (22) contacts are combined. There is.

[Problems to be solved by the invention] However, such a single-lip structure has a low sealing safety factor, and if a sudden malfunction such as abnormal vibration or intrusion of foreign matter occurs, its performance is easily weakened and the seal is sealed. It was inadequate, which could lead to loss of sex itself.

Further, the fluororesin material used as the sealing material here has excellent sliding characteristics, but is expensive on the other hand, and is poor in adhesiveness when forming a sealing material. Therefore, the fluororesin material is inserted between the two highly rigid members. It is fixed by sandwiching this with a member,
Therefore, the molding flexibility was low.

The present invention has been made in view of such many drawbacks, and an object thereof is to provide an integrated oil seal which is excellent in formability and can exert a strong sealing force.

[Means for Solving the Problems] The present invention will be described with reference to the drawings. As shown in FIG. 1, a housing and a shaft are arranged between two mutually rotating members, and the inside and outside of the two members are separated from each other. A combination seal comprising a plurality of members for sealing, the combination seal comprising a sealing element (3) having a sealing member (2) made of fluororesin fixed to a metal ring (1) having a substantially L-shaped cross section, and a cross section. A stopper ring (5) is inserted in the middle of the seal member (2) which is formed in combination with a substantially inverted L-shaped flinger (4) and has a flat ring shape or a substantially L-shaped cross section. At the same time as fixing to the metal ring (1), the ends protruding in the axial direction and the radial direction are used as free-standing seal lips (21) (21 '), and the respective seal lips (21) ( 21 ') to the inner peripheral surface of the flinger (4) in the axial direction and the peripheral surface in the radial direction It is characterized in that allowed touch.

Further, as shown in FIG. 2, an auxiliary lip (6) made of an elastic body is arranged on the retaining ring (5) and slidably contacts the inner peripheral surface of the flinger (4). .

[Operation] The oil seal of the present invention comprises a sealing element (3) and a flinger (4) as shown in FIG. 1, and the sealing element (3) is formed by a sealing member (2) made of fluororesin. ) Together with the retaining ring (5) into the inner part of the metal ring (1), the metal ring (1) is expanded to complete the fixing. At this time, since the retaining ring (5) is fixed to the middle part of the seal member (2), seal lips (21) (21 ') having free elasticity are formed at both ends thereof. When this sealing element (3) is assembled to a flinger (4) having an inverted L-shaped cross section, the respective sealing lips (21) come into contact with the inner peripheral surface of the flinger (4), where a strong sealing is achieved with a light sliding torque. An oil seal is formed that works.

[Example] To implement the oil seal of the present invention, a seal member (1)
Is a flat ring shape with good formability that enables punching molding from plate material or slice cut molding from pipe-shaped material, or it can be formed in a shape such as a substantially L-shaped cross-section that is molded in advance using a mold, and The width of the ring (5) is larger than that of the ring.

Further, when the auxiliary lip (6) is arranged on the retaining ring (5) for fixing the seal lips (21) and (21 ') and brought into sliding contact with the inner peripheral surface of the flinger (4), the above-mentioned fluorine is produced. The resin sealing lips (21) and (21 ') alone provide an appropriate sealing structure when the sealing force remains uncertain.

The retaining ring (5) for fixing the seal member (2) needs to have sufficient rigidity for expanding the diameter of the metal ring (1), but is not limited to the complicated structural material shown in the drawing. For example, in order to improve the contact deformability with the metal ring (1) by expanding the diameter of the fastening ring (5) in the seal member (2) as well, even if it is a spring material such as a C-shaped ring. It is also a good means to enhance the sealing force by providing a groove or rib on the surface of the deformed portion.

[Effects of the Invention] The present invention enables the installation of fluororesin seal lips at two locations with the above-described structure, and achieves extremely low sliding torque and a strong sealing force.

Of course, the seal lips (21) and (21 ') do not require a molding baking process or an adhesion process after formation, and do not cause weakening of the fixing force over time.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the oil seal of the present invention. FIG. 2 is a sectional view showing another embodiment of the present invention. FIG. 3 is a sectional view showing a mounted state of a conventional sealing device. 1 ... metal ring, 2 ... seal member, 21 ... seal lip, 3 ... sealing element, 4 ... slinger, 5 ... stop ring, 6 ... auxiliary lip.

Claims (2)

[Scope of utility model registration request] 1. A combination seal comprising a plurality of members arranged between two members that rotate with respect to each other and sealing the inside and the outside of the two members; the combination seal is a metal ring having a substantially L-shaped cross section ( It is composed of a sealing element (3) having a sealing member (2) made of fluororesin fixed to 1) and a flinger (4) having a substantially inverted L-shaped cross section, and has a flat ring shape or a substantially L-shaped cross section. The fixing ring (5) is inserted into the middle part of the sealing member (2) to be fixed to the metal ring (1), and the fixing ring (5) is exposed in the axial direction and the radial direction. Both ends of the seal member (2) are used as seal lips (21) (21 '), and the respective seal lips (21) (21') are brought into contact with the axial peripheral surface and the radial peripheral surface of the flinger (4). A combination seal characterized by that. 2. The combination seal according to claim 1, wherein an auxiliary lip (6) is provided on the retaining ring (5) and is brought into sliding contact with the inner peripheral surface of the flinger (4).