JPH0448364Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the structure of a lip-type seal used for sealing the rotating shaft of equipment such as a compressor for a car air conditioner.

[Conventional technology]

Traditionally, this type of lip-type seal is
As illustrated in FIG. 4, a rubber lip 3 whose outer diameter base 3a is tightly fitted into the inner peripheral surface of the shaft hole of the housing 1
and an outer diameter cylinder portion 4a embedded in the outer diameter base portion 3a.
and a metal inner ring 4 consisting of an inner diameter collar part 4b bent and extending from the rear end of this outer diameter cylindrical part 4a, and an outer diameter part 2a vulcanized on the back surface of the outer diameter end of the lip part 3b of the rubber lip 3. A lip 2 made of synthetic resin is bonded and supported by the inner diameter flange 4b, and both lips 2,
It is known that the inner diameter end of No. 3 comes into close contact with the outer circumferential surface of the rotating shaft S to seal the shaft.

[Problem that the invention attempts to solve]

However, in the above-mentioned conventional lip type seal, the synthetic resin lip 2 is simply vulcanized and bonded at its outer diameter part 2a to the back surface of the outer diameter end of the lip part 3b of the rubber lip 3, so that the rotation axis S and Due to the torque generated by sliding, the synthetic resin lip 2 may slip and rotate against the rubber lip 3 during long-term use, and this slip phenomenon may cause the sealing performance to deteriorate. There was a problem with the decline.

The present invention was developed in view of these points, and its purpose is to create a lip type that can reliably prevent the slip phenomenon of synthetic resin lips and stabilize the sealing performance. The goal is to provide a seal.

[Means for solving problems]

In order to solve the above problems, the present invention includes a rubber lip, a metal inner ring whose outer diameter cylinder part is embedded in the outer diameter base of the rubber lip, and a metal inner ring whose outer diameter part is embedded in the outer diameter base of the rubber lip. It is a lip type seal having a synthetic resin lip sandwiched between a back surface and an inner diameter flange of a metal inner ring, and a lip that is bent toward the rubber lip on the inner peripheral edge of the inner diameter flange of the metal inner ring. A locking projection is formed, and a notch extending in a radial direction is formed on the outer diameter portion of the synthetic resin lip, and the notch engages with the locking projection and a portion of the rubber of the outer diameter base extending around the outer circumference thereof. The structure is as follows.

[Effect]

According to the present invention, the radially extending notches formed on the outer diameter of the synthetic resin lip engage with the locking protrusions formed on the inner peripheral edge of the inner flange of the metal inner ring, and the outer circumference of the locking protrusions Since it engages with a part of the outer diameter base of the extending rubber, i.e., the rubber lip, it reliably prevents the synthetic resin lip from slipping against the rubber lip, and also prevents the synthetic resin lip from slipping due to sliding with the rotating shaft. Torque does not concentrate on the portion where the notch abuts the locking protrusion.

〔Example〕

Hereinafter, the present invention will be explained with reference to an embodiment shown in FIGS. 1 to 3. In the illustrated embodiment, the same reference numerals are used to describe the parts that have the same structure as those of the prior art example shown in FIG.

That is, in the lip type seal of this example,
Reference numeral 41 denotes a plurality of locking protrusions formed on the inner peripheral edge of the inner diameter flange portion 4b of the metal inner ring 4 whose outer diameter cylinder portion 4a is embedded in the outer diameter base portion 3a of the rubber lip 3, and bent toward the rubber lip 3 side. 21 is formed on the outer diameter portion 2a of the synthetic resin lip 2, and is connected to the locking protrusion 4.
These are a plurality of notches extending in the radial direction in the same phase as 1. The outer diameter portion 2a of the synthetic resin lip 2 is made of rubber with the notch 21 engaged with the locking protrusion 41 and a part of the rubber 31a of the outer diameter base 3a of the rubber lip 3 extending around the outer circumference thereof. It is sandwiched between the back surface of the outer diameter end of the lip portion 3b of the lip 3 and the inner diameter collar portion 4b of the metal inner ring 4.

According to the above configuration, the outer diameter portion 2a of the synthetic resin lip 2 is connected to the locking protrusion 41 of the metal inner ring 4 at the notch 21, and the rubber 31a extending around the outer circumference thereof.
Because of this, slippage of the synthetic resin lip 2 with the rubber lip 3 due to sliding torque with the rotating shaft S is reliably prevented. Moreover, since the notch 21 engages with the rubber 31a on the outer diameter side of the locking protrusion 41, the torque that the synthetic resin lip 2 receives is concentrated at the portion of the notch 21 that abuts the locking protrusion. It has excellent durability and does not cause damage.

[Effect of idea]

As described above, according to the present invention, the notch formed on the outer diameter of the synthetic resin lip is engaged with the locking projection formed on the inner diameter collar of the metal inner ring and the rubber on the outer periphery of the locking projection. This reliably prevents the synthetic resin lip from slipping against the rubber lip, and the torque generated on the synthetic resin lip is not concentrated at the notch where it meets the locking protrusion, so that the anti-rotation function is achieved. It is maintained for a long period of time and exhibits stable sealing performance.

[Brief explanation of the drawing]

Fig. 1 is a half-cut sectional view showing an embodiment of the lip-type seal according to the present invention, Figs. 2 A and B are explanatory views showing the structure of the metal inner ring, and Figs. 3 A and B are also made of synthetic resin. FIG. 4 is an explanatory diagram showing the structure of a manufactured lip, and FIG. 4 is a half-cut sectional view showing a conventional lip type seal. 2...Synthetic resin lip, 2a...Outer diameter part, 3
...Rubber lip, 3a...Outer diameter base, 4...Metal inner ring, 4a...Outer diameter tube, 4b...Inner diameter collar, 21...Notch, 31a...Part of outer diameter base rubber, 41...locking protrusion.

Claims (1)

[Scope of utility model registration request] A rubber lip, a metal inner ring whose outer diameter cylinder part is embedded in the outer diameter base of the rubber lip, and an outer diameter part between the back surface of the outer diameter base of the rubber lip and the inner diameter flange of the metal inner ring. It is a lip-type seal having a synthetic resin lip sandwiched between the lip and a locking protrusion bent toward the rubber lip on the inner peripheral edge of the inner diameter flange of the metal inner ring. A lip type seal, characterized in that a notch extending in a radial direction is formed in the outer diameter portion, and the notch engages with the locking protrusion and a portion of rubber of the outer diameter base extending around the outer circumference thereof.