JPH047399Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a sealing device related to shaft sealing technology.

[Prior Art] Conventionally, a seal made of a fluororesin material as shown in FIG. 3 has been known as a type of sealing device. This seal seals the annular gap between the equipment housing 1 (part of which is shown) and the rotating shaft 3 inserted into the shaft hole 2 of the housing 1. A structure in which the base end of a seal lip member made of a fluororesin material is held between the radial portions 5 and 7 of the two reinforcing (retaining) rings 4 and 6, and the tip thereof is closely slid on the circumferential surface of the rotating shaft 3. It is becoming.

[Problems to be solved by the invention] However, in the above seal, since the seal lip member is made of a fluororesin material, even if it is a snake-shaped thin plate made of a fluororesin material, it still has poor elasticity and is inferior in ability to follow shaft eccentricity. However, if the tightening margin is increased to improve this problem, the tightening force increases and the rotational torque increases. The larger the tightening allowance, the more difficult it will be to install.

In view of the above points, the present invention provides a sealing device that utilizes the features of fluororesin material, which inherently has excellent properties such as low friction as a sliding material, and is configured to eliminate the above-mentioned problems. It is something.

[Means for Solving the Problems] In order to achieve the above object, the sealing device of the present invention is a sealing device for sealing between an equipment housing and a rotating shaft inserted into a shaft hole of the housing.
A slinger fitted around the outer periphery of the rotating shaft, an inner periphery end of which is caulked to a retaining ring fitted to the inner periphery of the shaft hole of the housing, and an outer periphery end of which slides onto the end surface of the radial portion of the slinger. A seal lip member formed of a plate-shaped ring sheet made of a fluororesin material that is in contact with each other and is located between the seal lip member and the retaining ring, and presses the seal lip member against the radial portion of the slinger. It was decided to provide a spring member.

[Function] According to the sealing device having the above configuration, the fluororesin seal lip member is pressed against the radial portion of the slinger, so even if eccentricity occurs in the rotating shaft,
The pressed state can be maintained as it is, there is no need to increase the tightening margin, and the spring member can apply an appropriate pressing force to the seal lip made of a fluororesin material, which cannot exert a pressing force by itself.

Furthermore, since the retaining ring fitted to the inner peripheral surface of the shaft hole can be moved in the axial direction, it is possible to adjust the pressing force of the seal lip member against the slinger. This is effective when the pressing force on the radial portion of the slinger decreases due to wear of the sliding portion of the member, etc.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 1, a retaining ring 9 in which an axial portion 10, a curved portion 11, and a radial portion 12 are integrally formed is fitted into the inner circumferential wall of the shaft hole 2 of the equipment housing 1. A seal lip member 13 consisting of a plate-shaped ring sheet made of fluororesin material is attached to the tip.
Each inner peripheral end of the leaf spring 14 is caulked. The outer circumferential end of the seal lip member 13 extends diagonally from the inner circumferential end, and has a cross section of approximately L that is fitted onto the rotating shaft 3 with an appropriate pressing force due to the elastic force of the leaf spring 14.
It is pressed against the end surface of the radial portion 16 of the slinger 15 which has a letter shape. In FIG. 2, a coil spring 17 is installed between the seal lip member 13 and the retaining ring 9 in place of the leaf spring 14 in FIG. When the leaf spring 14 is used, it is used to supplement the pressing force due to the rigidity of the seal lip member 13, whereas when the coil spring 17 is used, the coil spring 17 is used as the contact portion of the lip seal member 13 with the slinger 15. is pressed directly.

[Effects of the Invention] As explained above, the shaft sealing device of the present invention has a seal lip member made of a fluororesin material pressed in the axial direction toward the slinger. Therefore, even if eccentricity of the rotating shaft occurs, this sealed state can be maintained, so there is no need to increase the interference as a countermeasure, and an increase in rotational torque can be suppressed. In addition, since there is no need to increase the tightening margin, the sealing device is not installed by pushing the lip member open like conventional products, so there is no risk of the lip turning over or being damaged. In addition to being able to prevent such problems, the resilient force of the spring member attached between the fluororesin seal lip member and the retaining ring prevents problems such as sagging of the seal lip member. Furthermore, since the retaining ring fitted to the inner peripheral surface of the shaft hole can be moved in the axial direction, it is possible to adjust the pressing force of the seal lip member against the slinger. This is effective when the pressing force on the radial portion of the slinger decreases due to wear of the sliding portion of the member, etc.

[Brief explanation of the drawing]

FIG. 1 is a half-cut sectional view showing the installed state of a sealing device according to an embodiment of the present invention, FIG. 2 is a half-cut sectional view of the same according to another embodiment of the present invention, and FIG. It is a half-cut sectional view. 1... Equipment housing, 3... Rotating shaft, 9...
Retaining ring, 13... Seal lip member, 14... Leaf spring, 15... Slinger, 17... Coil spring.

Claims (1)

[Scope of utility model registration request] A sealing device for sealing between an equipment housing 1 and a rotating shaft 3 inserted into a shaft hole 2 of the housing 1, which includes a slinger 15 fitted to the outer periphery of the rotating shaft 3 and a slinger 15 fitted to the inner periphery of the shaft hole 2. Retaining ring 9 to be attached
The inner peripheral end is caulked to the retaining ring 9, and the outer peripheral end is in slidable contact with the end surface of the radial portion 16 of the slinger 15, and is molded with a plate-shaped ring sheet made of fluororesin material. The seal lip member 13 is provided with a seal lip member 13, and spring members 14 and 17 are provided between the seal lip member 13 and the retaining ring 9 and press the seal lip member 13 against the radial portion 16 of the slinger 15. Sealing device.