Roll or roller – Rotatable relative to supporting shaft
Reexamination Certificate
1999-08-10
2001-02-27
Rosenbaum, I. Cuda (Department: 3726)
Roll or roller
Rotatable relative to supporting shaft
C492S007000
Reexamination Certificate
active
06193639
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. §119 of German Patent Application No. 198 36 975.1, filed on Aug. 14, 1998, the disclosure of which is expressly incorporated by reference herein in its entirety.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a deflection compensation roll having a jacket lift, whose jacket is rotationally mounted, through a hydrostatic support device, on a carrier (bracket) secured against rotation. A radial seal and an axial seal are provided at the roll ends between the jacket and the bracket.
2. Discussion of Background Information
A deflection compensation roll of the type generally discussed above is known, e.g., from DE 31 19 387 C2. The structure of the sealing arrangement is complicated because both the axial seal and the radial seal must perform their function despite considerable radial motion of the jacket caused by the jacket lift.
SUMMARY OF THE INVENTION
The present invention simplifies the sealing arrangement in a deflection compensation roll of the type described above and structures the sealing arrangement in a more compact manner.
According to the present invention, a ring body is arranged in an axially moveable manner in a ring groove that is connected to one of a jacket or a carrier (bracket). The ring body includes a face positionable adjacent to the atmosphere and a circumference, and carries, on the face positionable adjacent to the atmosphere, an axial sealing lip arranged to contact one side wall of the ring groove, and, on the circumference, a radial sealing lip arranged to contact, and rotate relative to, a cylindrical sealing surface connected to the other of the jacket or the carrier. The ring groove is designed for a lift of at least approximately 20 mm.
A very simple structure of the sealing arrangement is achieved in that the element providing the axial seal and the element provinding the radial seal are carried jointly by a ring body that is able to compensate for all radial motion between the jacket and the carrier by being displaced within the ring groove. Thus, the required space is small. The sealing arrangement is suitable for all customary sizes of deflection compensation rolls provided with a jacket lift because lifts within the ring groove of over approximately 20 mm, e.g., approximately 30 or 35 mm, can be achieved.
It may be advantageous for the ring groove to be connected to the carrier and the cylindrical sealing surface to be connected to the jacket. In this design, the ring groove and ring body are not rotatable relative to the jacket. Therefore, their associated masses do not need to be accelerated or decelerated.
In an exemplary embodiment, the radial sealing lip can be located on the outer circumference of the ring body and the ring groove can be located near the carrier. This way, the sealing arrangement can have a small diameter that has not heretofore been achieved.
In the exemplary embodiment, the side wall of the ring groove, which is adjacent to the atmosphere, may be arranged to radially extend or protrude beyond the other side wall of the ring groove and a recess for accommodating the protruding section may be provided next to the cylindrical sealing surface. Because the forces exerted on the ring body due to a pressure present in the interior of the jacket can be absorbed properly, the present invention results in the greatest possible support of the ring body on the side wall of the ring groove adjacent to the atmosphere.
The ring groove can be formed by two disk plates and a spacer ring that is arranged between them. Such an arrangement is functionally secure and can also be used for ring grooves with large diameters. The three-part construction of the ring groove also allows for simple insertion of the ring body into the ring groove.
Further, the ring body may be secured against rotation relative to the ring groove by a torque converter bearing. Such a torque converter bearing can be formed, e.g., by a radial pin placed in a bore in the ring body and in a bore in the base of the ring groove.
It may be further advantageous for the ring body to be reinforced by a metal ring. Since the ring body is stiff, it can follow every radial movement made by the jacket relative to the carrier.
Particularly, the metal ring can be formed by a steel band positioned adjacently to the circumference of the ring body that is free of the radial sealing lip. On this circumference, the largest possible working surface between the steel band and the ring body results. As a rule, no additional devices of attachment are necessary.
It may also be advantageous for the ring body to carry a support flange arranged next to the radial sealing lip. The support flange may be provided with openings, and can give the ring body a defined position relative to the cylindrical sealing surface, which can result in a defined deformation of the radial sealing lip.
In an advantageous embodiment, at least one sealing lip may be formed as one piece with the ring body. This may be especially true when the ring body is made of, e.g., plastic, such as polytetrafluoroethylene.
Accordingly, the present invention relates to a deflection compensation roll with a jacket lift. The deflection compensation roll includes a carrier that is fixed against rotation, a support device coupled to the carrier, a jacket rotatably mounted on the support device, and a radial seal and an axial seal positioned between the jacket and the carrier. A ring groove is coupled to one of the jacket and the carrier, a ring body is arranged for axial movement in the ring groove. The ring body includes a face adjacent to an atmosphere outside of the jacket and a circumference. A cylindrical sealing surface is coupled to the other of the jacket and the carrier. An axial sealing lip is located on the face adjacent to the atmosphere to contact a side wall of the ring groove, and a radial sealing lip is located on the circumference to contact, and to rotate relative to, the cylindrical sealing surface.
In accordance with a feature of the present invention, the ring groove may be adapted to accommodate a jacket lift of at least 20 mm.
According to another feature of the present invention, the ring groove can be coupled to the carrier and the cylindrical sealing surface is coupled to the jacket.
According to still another feature of the present invention, the circumference can include an outer circumferential surface, the radial sealing lip may be located on the outer circumferential surface, and the ring groove may be located near the carrier.
In accordance with a further feature of the present invention, the side wall of the ring groove in contact with the axial sealing lip may have a portion extending radially past an opposing side wall of the ring groove. The deflection compensation roll further can include a recess located next to the cylindrical sealing surface, which is adapted for accommodating the extending portion of the side wall.
In accordance with a still further feature of the instant invention, the ring groove can include two disk plates and a spacer ring may be positioned between the two disk plates.
According to still another feature of the instant invention, a torque converter bearing may be provided, and the ring body can be secured against rotation relative to the ring groove by the torque converter bearing.
According to another feature of the present invention, the ring body can include a reinforcing metal ring. The metal ring may include a steel band positioned adjacently to a circumferential surface of the circumference not in contact with the radial sealing lip.
In accordance with a further feature of the invention, a support flange can be coupled to the ring body. The support flange includes openings that may be arranged next to the radial sealing lip.
In accordance with yet another feature of the present invention, at least one of the axial sealing lip and the radial sealing lip may be formed as one piece with the ring body.
The present invention also relat
Cuda Rosenbaum I.
Greenblum & Bernstein P.L.C.
Voith Sulzer Papiertechnik Patent GmbH
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