Bearings – Rotary bearing – Fluid bearing
Patent
1996-07-24
1998-02-10
Hannon, Thomas R.
Bearings
Rotary bearing
Fluid bearing
384117, F16C 3206
Patent
active
057161429
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to radial journal bearings with one or several slide shoes, each having an interior bearing surface opposed to an exterior bearing surface.
DESCRIPTION OF THE PRIOR ART
A slide shoe means typically a moving part, which is loaded to contact against a bearing surface, so that one end of it is in contact with the bearing surface with a suitable contact face. The contact face may comprise a pressure pocket, which is open towards the bearing surface, and which via channels in the slide shoe is imparted with a hydrostatic pressure. The hydrostatic pressure in the pressure pocket relieves the Contact pressure between the bearing surfaces.
A radial journal bearing of this type may be shaped like two circular, opposing bearing surfaces, which are in sliding contact with each other while rotating in relation to each other, and in which in one of the bearing surfaces one or several slide shoes are placed for hydrostatic relief of the bearing. However, one of the bearing surfaces of the radial journal bearing may also, as indicated according to U.S. Pat. No. 51,82,978 , consist exclusively of a number of slide shoes, which are arranged radially in relation to the opposed circular bearing surface.
The function of these types of bearings depends on a well defined hydrostatic pressure in the pressure pocket of the slide shoe for relieving the bearing surfaces, and it is therefore important that no variations occur in the leakage from the pressure pocket.
German Patent No. 29 32 583 shows a design where the slide shoe is placed radially sliding in a guide, and where under the slide shoe in the guide, hydraulic pressure can be applied to press the slide shoe to contact against a rotating bearing surface. This ensures that there will always be contact pressure between the contact face of the slide shoe and the rotating bearing surface, so that any displacements of the rotating bearing surface away from the slide shoe are prevented by displacements of the slide shoe in its guide.
BRIEF SUMMARY OF THE INVENTION
The intention of the present invention is to indicate a radial journal bearing with slide shoe and a slide shoe for such a radial journal bearing, which reduces the risk of variations of the leakage between the contact face of the slide shoe and the opposing bearing surface.
These variations of the leakages between the contact face of the slide shoe and the opposing bearing surface may arise at transverse displacement of the bearing surfaces in relation to each other, for example as a consequence of the friction between a shaft in one bearing liner causing the shaft to tend to run out of centre and up against its own direction of rotation along with the bearing liner, so that it ends up orbiting in the bearing against its direction of rotation.
It is an object of this invention to overcome these problems.
It is a further object of this invention to provide a radial journal bearing where the slide bearing can take up tilting of the bearing surfaces in relation to each other.
It is yet a further object of this invention to provide a radial journal bearing, where the entire slide shoe can tilt in its guide as a consequence of a clearance between the slide shoe and the guide. This embodiment is easy to install as well as cheap to produce.
It is still a further object of the invention to provide alternative, and suitable embodiments.
Depending on the application of the slide bearing, the slide shoes can be placed on the interior surface of the slide bearing or on the exterior one. For example, the slide shoes can be placed on the bearing surface where a permanent high load area can be defined.
The claims indicate special embodiments of radial journal bearings according to the present invention such as throttle channel for controlling the hydraulic pressure that is fed into the pressure pocket of the slide shoe.
The above mentioned advantages of the invention are considerable in particular in connection with bearings in water-hydraulic piston engines, because t
REFERENCES:
patent: 3675977 (1972-07-01), Arsenius et al.
patent: 3791703 (1974-02-01), Ifield
patent: 4530227 (1985-07-01), Schlatter et al.
patent: 4540221 (1985-09-01), Frazer
patent: 4919549 (1990-04-01), Lawson et al.
Jepsen Hardy Peter
Kristensen Egon
Danfoss A/S
Hannon Thomas R.
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