JPS6073172A - Lip seal - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to seals, and in particular υ1 non-alternative;
It relates to a seal such as that used for sealing a ring gap between a shaft and a housing that is l1i1 inverted relative to this shaft, i.e. the housing through which such a seal extends.

British Time 71 Application No. 7944248 (No. 20 (
According to i (publication i C184), a seal assembly is described that has a thin polytetrafluoroethylene sleeve-like member on the ring surface of a flexible conical support. The sealing pressure of the garter spring and support is applied to the shaft to be sealed via the shaped member.

The seal assembly constructed according to the description and description of the above-mentioned known specification serves the basic purpose of providing a fluid seal between a rotatable shaft and a fixed housing of 11 digits. Although it is well suited for and widely used in applications related to this, it is especially important when the shaft is fixed and the housing is rotated with a seal (= 1 digit) about such a shaft. , : When rotating at 11 speed, it may be difficult to seal for 1 minute.

SUMMARY OF THE INVENTION One object of the present invention is to provide a seal assembly for a particular purpose in connection with a fixed shaft and rotating housing combination.

According to the present invention, the following seal assembly is proposed. In order to provide a seal between relatively movable parts, a housing, a sealing member supported within the housing and fitting onto the surface to be sealed so as to provide a seal;
In a sole assembly that includes a Y stage of garter springs equipped with a sealing member so as to seal such a surface, a 4' + river restraint part is provided on the garter spring to suppress expansion by +1. A collection of stickers featuring a unique texture.

A haiku bundle 1 "IRii" may be included in the IX receptacle, in which a garter spring is fitted to prevent it from stretching in the human body, or The element may include a ring element made of rubber or a similar material, into which a garter spring is embedded in a predetermined expanded configuration.

Examples of the invention will be described below.

According to FIG. 1, a seal constructed in accordance with the invention includes a gauge 7 having a generally L-shaped cross-section, the gauge having a generally cylindrical shell 2 and a generally cylindrical shell 2 extending radially inwardly at one end. and a oriented flange 3. shell 2
The end of the flange 4, which is 1iill force free, is shaped to prevent debris from entering the seal.

An elastically deformable sealing support 5 in the form of a piece of elastomeric material is mounted in the fitting by a sleeve 6, which has a figure-11 cross-section throughout and is connected to the support 5. The lip 7 fits into a notch between the shell 2 and the sleeve 60. A low-friction, hard-to-wear sleeve or shell 8 is provided inside the support 5 and axially lrJ with it, and is fitted with a seal on the surface c71i of the shaft (not shown by the overall center 9). Let it form.

The garter spring 10 is attached to the side 11 of the support 5 facing towards the axis 9.
It fits securely into the ring groove 12 in the ring. 7+V
Spring in 7 + 2] The tight connection of 0 is
When considered in the cross-sectional direction of the coil, such an IJJ chip extends over more than half the circumference of the knee,
This is possible by configuring the In this example, the groove extends from 75% to 85% of the circumference, and the other half of the groove has an increments of 1-2.
1, these notches can closely receive the surface of the spring (Iipa 1), and are located between the right turns next to the bracket-like spring. It may be a partial circle.

The cooperation between the knurling 11 and the spring winding H serves to prevent the spring from expanding under centrifugal forces during rotation, and so that the sleeve 8 is in close contact with the shaft. .

The support t1f body 5 is made of synthetic material or 75 to 8°I R
The sleeve 8 may consist of a synthetic rubber of Hl), while the sleeve 8 may consist of polydetrafluor Jl+edge/or a similar composite l7yi which has a low coefficient of friction.

Fitting the spring tightly within the support, so that it does not expand during rotation, provides an alternative to using stronger springs that better resist the centrifugal forces created by rotation of the housing, and By actually using the spring, the increase in centrifugation) can be avoided.

In the modified tiVt configuration shown in FIGS. 2 and 3, the garter spring 21 wrapped in the rubber ring 22 is provided on the outside in the direction of the radial horn of the flexible seal support 230, and is located on the outer side of the seal support t1j. It is positioned by the lip 24 formed on the body, and the spring 2
1 is a spring 21. ! l: If! Apply a V 4"l' II force to the sleeve or shell 25 of the polydetraful blade IJy: through the reno 26.

In contrast to the embodiment shown in FIG. 1, the spring/link combination +ill, 22 is not fixedly arranged within the groove.

This is because expansion of the spring is prevented by the abrasive material of the ring and the expansion resistance created by such a tight bond is unreliable. The garter spring 7977 combination is a constant negative 1:1 characteristic 111, so the garter spring, which is a closed: I ile spring, is installed inside the ring, while in the extended form (with an inner diameter of 0.9s++ When the wire shaft is made into a :2 tile with an inner diameter of 4 mm, the helix angle in the molded combination is lj ↓ J (4 mm in terms of t1).
5°, - force 0.45 I made a gland with a diameter of 3 + 11110) ll'l diameter ゛I is stretched in f and molded 1111 with a helical angle of 53)° 1.

If the extension of J, Ruhane/11 outside the ring is the minimum in the violent force, and this J, Unabane is molded into the -horn, ring, +'+i+: Iir spring is extended,
Chisel ■ Negative φ'44 for spring/sleeve/rest combination. 'j
I knew I was going to get t'l or 'lj.

In yet another embodiment according to FIG. 4, in which the relevant parts of the sealing device are not shown, the spring/linog mating 4142 is located within /M43 on the lower radial inner surface 44 of the flexible seal support 45. This kind of spring 7977 combination 4
1.42 inserts an integral lip 46 with a triangular cross section, through which the spring 41 is connected to polydetrafluoro l:l.
-1-Chile/Sleeve or Shi. 47.

The invention is not limited to the details of the embodiments described so far, as variations will be obvious to those skilled in the art.

For example, the proposed garter spring/:17 ring combination can be used in conjunction with a conventional lip seal instead of a recessed garter spring, and with a shaft and a 1ji1 Not only the horizontal system that seals between the rotating housings, but also the housings I+! "1
It is thought that this applies also to +M constructions in which the shaft is rotated relative to this.

As a modification that prevents or suppresses extension by wrapping the spring in a ring member made of elastomer 4/IF:t, normal movement A'1 is possible in some cases, but any 4A 11 A110H (+, ! Degree R]! ((Just insert the end wire 4 into the Kirk spring and the
It is J interest.

[Brief explanation of the drawing]

1 is a schematic sectional view showing a first embodiment of the present invention, FIG. 2 is a diagram corresponding to FIG. 1 showing a second embodiment of the present invention, and FIG. 3 is a schematic sectional view showing a second embodiment of the present invention. FIG. 4 is a small partial sectional view of a modification of the twenty-first embodiment. I I-Ring, 2...Shi, Le, 3...Solange, 5
・x Up (+, (i ・Sleeve, 8...Shell, 9...Shaft, 10 ・Nof-evening spring, 12...
l, 7i. 4.'I Applicant C, -, H, F. Su-, At, Tsuno 7 Bunny, Limit Agent BR111th Gen Tsuyoshi

Claims (2)

[Claims] (1) It is provided between a first part and a second part surrounding it, in which case one part is capable of rotating 4( ) with respect to the other part, 411. A sealing device comprising a sealing member that seals with respect to a surface of a first component by including a garter spring, wherein the garter spring has its extension restricted by a restraining portion +A. The sign is a whelk seal. (2) The binding part material is:1. A part of the part 4 consisting of a last mer ratio of 1:1 is fitted between the adjacent right turns of the spring, and by increasing the amount of H 11 to the spring, the spring The circumferential length in the JJ direction is prevented from increasing.
1. Scope of claims> IJJI description. ), 1. Sostomer 4Af: The part consisting of 1 (, (, is in the form of a ring completely surrounding the spring, special l'
A war seal as described in claim 1.