JPS5850362A - Seal with lip-shaped section for rotary member - 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 lipped seals for rotating parts, particularly of the type referred to as "shinless", which seals have at least one sealing edge for cooperating with the rotating parts. a base having a generally trapezoidal cross-section cooperating with a fixed part combined with said rotary part; and a base having a generally trapezoidal cross-section connecting said lip and said base; It includes a sleeve for resilient support, said base having a back and a front surface, at least one of which has a frustoconical shape, and a cylindrical surface for cooperating with an opposing surface of said fixation member.

A lip-shaped seal without a crease has the advantage that it can be manufactured easily and inexpensively with precision compared to a seal with a crease because it does not have a crease.

However, currently known sealless seals, on the other hand, have considerable drawbacks, namely their manufacture is complex due to the relatively precise dimensions required, and their generally complex shape makes it difficult to mold. They are more difficult to manufacture and more expensive, require parts to extrude the various faces of the fiducial (back, front) to hold them in position, and these faces themselves must be made to very precise tolerances. These seals are particularly expensive due to their complex shapes, and lastly, because these seals are obtained by casting different synthetic elastomeric materials, each exhibiting a different coefficient of shrinkage, the associated precision Because of the required tolerances, each mold for casting a particular elastomer must also be prepared in detail.

The object of the invention is essentially to provide an improved seal which obviates as far as possible the above-mentioned disadvantages and which answers the various practical requirements better than hitherto, in particular with respect to simplification of manufacture and installation. .

To achieve these objectives, according to the invention, the base further includes at least one annular groove on at least one dorsal, front and cylindrical surface, whereby the base is subjected to longitudinal compression. Provides resorption volume when received.

With this configuration, the annular expansion groove forming a reabsorption volume against longitudinal compression can be subjected to a considerable amount of axial compression at its base due to the axial tightening restraint or "ram". When the elastomer deforms, it helps to reabsorb it. Because of the deformation of the elastomer that occurs in this way, it is no longer necessary to precisely control the dimensions as before, and the base is tightened on all its sides to prevent any seepage into the fixed part during the installation of the seal. , and re-sweeping, as well as ensuring engagement with rotating members.

As for the push rods, their tolerances are less stringent as a result of the construction described above, and these parts can be manufactured inexpensively, for example using a simple conventional lathe.

Finally, the casting operation is made simpler and cheaper because the same mold can be used to remove the elastomer from the mold, regardless of the shrinkage of the elastomer used.

According to an application example of this seal, the back part is generally flat and extends substantially perpendicular to the axis of the seal, and the front part is truncated-conical, or the back part is truncated-conical and the front part is generally flat. and extends generally perpendicular to the axis of the seal; alternatively, both the back and front surfaces can be truncated Fl-conical. In this case, in combination with this seal, a perpendicularly cut ram rests on the side sealing the flat back or the flat front and/or a truncated truncated ram is used. It abuts at the side that seals with the back and/or front of the conical shape.

Preferably, the base has at least three annular grooves formed on the back, front and cylindrical faces, respectively.

Furthermore, an annular groove is provided on the inner surface of the lip, which groove receives an annular spring to elastically press the lip against the rotating part.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be better understood from the following description of preferred embodiments of the invention, which are not necessarily limited to the drawings and in which: FIG.

In the accompanying drawing, which shows a cross-sectional view of the seal according to the invention in use, a seal 1 made of a synthetic elastomer, such as fluoride-containing nitrile or an elastomer 1, has a lip 2; A sealing edge 3 is provided, which seals with the surface of the rotational shaft 4 by the action of an annular spring 5 housed in an annular groove 6 formed on the outer surface of the lip or on the surface opposite the edge 3. They are kept in contact with each other in a sealed state.

The lip 2 is carried by the free end of a sleeve 7 which extends from a base 8 for extruding or securing the seal. The base 8 is
a back part 9 which is substantially flat and substantially perpendicular to the axis of the seal; a frusto-conical front face which is conically curved towards the back; and a cylindrical surface 11 which cooperates with the surface of a fixed member such as a casing.
have. In other words, the base has a trapezoidal shape in cross section, the larger base or maximum width of which coincides with the cylindrical surface 1.

The front surface]0 makes an angle with the back surface between about 25° and 35°, preferably on the order of 30°. The sleeve 7 has an angle between about 90° and 105° with the back 9 of the base, e.g. 10,000°.
form a corner.

An annular groove 4 having a substantially semicircular cross section is formed at the joint between the outer surface 13 of the sleeve 7 and the front surface 10 of the base 8.

In the back 9, front 10 and cylindrical surface 11 of the base there are grooves 1.
5, 1.6 and 17 are respectively formed, whereby the seal cooperates with a front ram 18 with a frusto-conical surface co-operating with the frusto-conical front surface 10 of the base and with the back part 9 of the base. When the base is compressed and tightened between the rear thrust rod 19 having a vertical surface, the deformation of the elastomer is reabsorbed (
However, in the figure, the seal is in use but not compressed).

In the embodiment, the grooves 15 and 17 formed in the back part 9 and the cylindrical surface 11 have a trapezoidal cross-section with rounded angles, and the grooves 16 formed in the front face 10 have a triangular cross-section with a rounded apex. Has a cross section.

Of course, the number as well as the shape of the grooves formed on the back 9, front 10 and cylindrical surface 12 are shown for illustrative purposes only and can take on various forms depending on requirements. . Similarly, only one or two of these surfaces may be provided with grooves.

As is obvious and can be seen from the foregoing description, the invention is not limited to the embodiments described above with respect to particular applications and embodiments, but includes all modifications thereto.

Although particularly illustrated and described with respect to an embodiment of a seal with an inner lip for a rotating shaft, it is contemplated that a seal with an outer lip may be used with respect to a rotating case and a stationary shaft without departing from the scope of this invention. On the other hand, similar means can be substituted.

Similarly, the seal according to the invention may be provided with a dust-proof lip or a leak-proof spring lip extending from the junction of the sleeve and the base.

Finally, the base 80 trapezoidal surface shape can be obtained by various configurations of the back and front, i.e. the back is truncated and the front is flat and perpendicular to the axis of the seal, or both the back and front are truncated. It can also be formed into a conical shape. Mochi theory,
Accordingly, the thrust rod also has a surface that conforms to these surfaces.

[Brief explanation of the drawing]

The figure is a sectional view of the seal according to the present invention in a state of use. 1... Seal 2... Lip shaped part 3... Sealing edge 4... Rotating shaft 5... Annular spring
6... Annular groove 7... Sleeve 8... Base 9... Back 10... Front trapezoidal surface 11.
...Cylindrical surface 12...Fixing member 13...Outer surface 14...Annular groove 15.16.17...Groove] 8...Front thrust rod 19...Stroke rod patent applicant Societe dexbroccion de procedofelix zamio nis, woo, peichi, f, ah.

Claims (1)

[Scope of Claims] 1. At least one lip having at least one lip for cooperating with a rotating member, and substantially at least one lip for cooperating with a stationary member associated with the rotating member. a base having a generally trapezoidal cross-section; a sleeve connecting the lip and the base and resiliently supporting the lip, the base having at least one truncated conical shape; a front surface and a cylindrical surface cooperating with an opposing surface of said fixation member, the base including at least one annular groove in at least one of the back, front and cylindrical surfaces such that the base is longitudinally The positioning of the seal provides a reabsorbing volume under compression and is gripped on all its surfaces, during which it bleeds into fixed members, and re-squeezes, and which grips onto rotating parts. A seal with a lip for a rotating member, which is characterized by ensuring the following. 2. The lip for a rotating member according to claim 1, wherein the back portion is substantially flat and substantially perpendicular to the axis of the seal, and the front surface has a frustoconical shape. I'ki sticker. 3. The lip shape using a rotating part according to claim 1, wherein the back part has a truncated conical shape, and the front face is substantially flat and extends substantially perpendicular to the axis of the seal. Department sticker. 4. The lip-shaped seal for a rotating member according to claim 1, wherein the back and front surfaces have a truncated conical shape. 5. Claims according to any one of the preceding claims, characterized in that the conical shape of the back and/or the front is oriented in such a way that the axial length of the base is greatest at the position of the cylindrical surface. A seal with a lip for rotating parts. 6. A claim in which the base is provided with at least three annular grooves formed on the back, front, and cylindrical surfaces, respectively.A lip-shaped lip using a rotating part according to any one of the above claims. 7. An annular groove is formed on the outer surface of the lip, and the groove is configured to receive an annular spring. Claim 7: Claims according to any one of the above claims. A seal with a lip for a rotating member according to claim 8, further comprising another annular groove at the joint between the front surface of the base and the inner surface of the sleeve. A seal with a lip for a rotating member of 9. Claims 9 above, characterized in that the conicity of the front surface is between about 25° and 35°, and preferably on the order of 30°. 10. A seal with a lip for a rotating member according to any one of the preceding claims.10.The sleeve forms an angle between about 90° and 105° with the back. A seal with a lip-like part for controlling a rotating part as described in any one of the above items.