Bearings – Rotary bearing – Plain bearing
Patent
1992-06-16
1994-01-25
Hannon, Thomas R.
Bearings
Rotary bearing
Plain bearing
92136, 384152, 384296, F16C 1700, F16C 3372, F01B 3100
Patent
active
052810348
DESCRIPTION:
BRIEF SUMMARY
The invention is directed to a shaft which is rotatably supported in through-holes of the housing of a pressure chamber in bushes and secured against axial displacement by securing rings, as well as to sealing rings between the bearing side of the shaft and the bush on one side and between the bush and the housing on the other side.
Bushes can be provided for the rotatable support of a shaft in a housing which are guided through the wall of the housing and supported on the wall. The bush is recessed into the wall of the housing and can also be screwed, wedged or pinned to the wall in addition. Every bush has an external annular flange by means of which the bush is supported on the wall in the axial direction of the shaft from the outside, that is from the side of the wall of the housing remote of the pressure chamber. A securing ring which is placed from the outside on each end of the shaft projecting out of the bushes forms the closure and is supported on the outside end faces of the bushes. The axial position of the rotatable shaft within the housing is fixed by means of this arrangement. The securing rings accordingly fix the shaft in its position in relation to the housing so that the shaft can not wander out or be pulled or pushed out of the housing in either axial direction (DE-OS No. 34 43 302).
Although the known arrangement has the advantage that it can be mounted in a simple manner, it nevertheless has a number of disadvantages:
the securing rings can wear easily because the end faces of the bushes facing the pressure chamber are constantly acted upon by pressure;
due to the application of pressure on the bushes, the shaft, in turn, is constantly acted upon by tensile force via the securing rings;
when a securing ring breaks, the respective bearing bush also loses its secure support. If the pressure force acting on the front annular surface of the bush exceeds the force by which the bush is held in the housing, the latter can be suddenly detached and thrown out in the manner of a projectile;
the securing rings are constantly loaded and therefore generate high friction.
Based on these disadvantages the object of the present invention is to improve the known support of the rotatable shaft in the housing of the pressure chamber in such a way that a wear-resistant and secure arrangement of the shaft and bearing bushes is achieved.
This object is met in that every through-hole of the housing comprises a collar which projects radially inward and forms a support for a projection which is directed radially outward and with which every bush is provided, and the front side of the latter facing the pressure chamber simultaneously forms a support for a securing ring arranged on the shaft, wherein the two bearing sides of the shaft have the same diameter. The shaft is accordingly relieved of tension and the bearing bushes can not be propelled out by the internal pressure of the housing. The securing rings are likewise relieved of tension so that there is no longer any frictional wear. The equivalence in diameter of the bearing sides ensures that no axial force is applied via the shaft itself.
The invention is described in more detail in the following with reference to an embodiment example:
FIG. 1 shows a cross section through a pressure cylinder. Such cylinders comprise two pistons which are movable in opposite directions, each piston comprising a toothed rack meshing with the pinion of the rotatable shaft and accordingly rotating the shaft when moved.
The housing 1 of the pressure cylinder encloses the cylindrical pressure chamber 2 which extends vertically in end-to-end length with respect to the drawing plane of the figure. The pressure chamber 2 is filled with a pressure medium, e.g. compressed air or hydraulic fluid, via a connection 3. The pressure medium is removed from the pressure chamber 2 via a connection 4 which opens into an axial bore hole 5. The inlet and outlet of the pressure medium is controlled e.g. via valves and/or slides (not shown) which are arranged outside the housing 1 and communica
REFERENCES:
patent: 2844127 (1958-07-01), Steiner
patent: 3040717 (1962-06-01), Rumsey
patent: 3148595 (1964-09-01), Looney
patent: 3246581 (1966-04-01), Carr
patent: 3776611 (1973-12-01), Jentsch
patent: 3982725 (1976-09-01), Clark
patent: 4281588 (1981-08-01), Jaske
H & K Antriebstechnik GmbH
Hannon Thomas R.
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