Hydraulically operated rotary actuator

Details Hydraulically operated rotary actuator Hydraulically operated rotary actuator

1999-04-06

2001-06-19

Ryznic, John E. (Department: 3745)

Expansible chamber devices

Rectilinearly moving working member and coaxial or parallel...

Element extends through working member portion

C092S136000

Reexamination Certificate

active

06247390

ABSTRACT:

FIELD OF THE INVENTION
The present invention concerns a hydraulically operated rotary actuator.
RELATED TECHNOLOGY
A rotary actuator described in European Patent No. 0428439 No. A1 has two axially joined, partially overlapping housing halves which together border an inner space and develop axially toward the outside into neck-like projections. These have axial receptacle orifices for form-fitting locking with elements which can turn in opposite directions in the form of web parts of a rotation stabilizer which are connected coaxially via the rotary actuator. With the basic U shape of the rotation stabilizers conventional with drive stabilizers, the web parts of the rotation stabilizer bear stabilizer arms that run in the longitudinal direction of the vehicle at their mutually remote ends, these arms acting on the wheels of one axle which are connected to one another via the drive stabilizer, or acting on their guide elements.
Of the two partially overlapping housing halves of the rotary actuator provided in extension of one another, one housing half has a shoulder as an inner body concentric with the common axis, projecting into the inside of the housing in such a way that the jacket part of this housing half together with the inner body formed by its central shoulder borders an annular space in which is arranged an annular piston provided with a bushing extending toward the other housing half, overlapping the shoulder and closed on its remote end and partially covered by the jacket part of the other housing part as the outer body. The purpose of this design is to create a first working chamber between the annular piston and the adjacent end face of the annular space, with a second working chamber being formed opposite the former, between the other housing half and the end-face closure of the sleeve. Thus, a working chamber having a ring cross section on the one hand and a working chamber having a circular cross section on the other hand are provided for the opposite ends of the housing. Between them, the teeth required for the rotational adjustment are provided between the inner body and the piston on the one hand and the bushing and the outer body on the other hand, with the piston also extending over a toothed area of the inner body, so that only a relatively small ring cross section is available as the piston cross section based on a given outer diameter.
A rotary actuator designed in this way, with the axially mutually overlapping housing halves being braced axially and with respect to one another so they can rotate about their common axis over exterior bearing collars, is complicated, takes a relatively long time to manufacture and necessitates removal of the drive stabilizer for installation and removal of the rotary actuator because of the axial overlap with the web parts.
SUMMARY OF THE INVENTION
The present invention provides a rotary actuator having a simple and compact design, and due to its construction, the present invention also offers favorable assembly requirements.
The present invention therefor provides a hydraulically operated rotary actuator (
1
) having an outer body (
7
) and an inner body (
8
) coaxial with the former and covered by the outer body axially over its full length, fixed with respect to one another so they can turn axially in opposite directions, each forming a gas-tight connection for an element (
2
or
3
) of two elements (
2
,
3
) to be turned opposite from one another and bordering an annular space (
12
) in which is arranged a sleeve having an annular piston (
29
) and axially connected to it a bushing (
32
), of which the annular piston (
29
) moves on cylindrical surfaces of inner body (
8
) and outer body (
7
) and separates from one another two working chambers (
30
,
31
) that can be acted upon by pressure, and of which the bushing (
32
) is provided with helical teeth (
35
,
36
) on the inside radially and on the outside radially, engaging with corresponding teeth (
37
,
34
) on the inner body (
8
) and the outer body (
7
) having a different sweep of the teeth.
In accordance with the present invention, the parts of the rotary actuator which are to be adjusted relative to one another, i.e., the parts of a rotary actuator that are to be connected to the web parts of a stabilizer, for example, may be arranged one inside the other, so that the inner part is covered by the outer part to be turned oppositely from it, and the respective drive pinions can be assigned to the inner part on the one hand and to the outer part on the other hand. In conjunction with such a design, the piston area and the toothed area can be separated axially, so that relatively large piston areas can be achieved with a compact design. In particular, however, this yields a unit which can easily be arranged with all working parts between the respective drive pinions and the elements to be turned in opposite directions, so that the flanges assigned to the drive pinions can also form cover parts of the rotary actuator, resulting in a shortening and further simplification of the overall construction, and making it less expensive.
It is especially advantageous within the scope of the present invention to mount the inner body and outer body radially and axially over ring collars provided for the inner body and axially covering the annular space between the inner body and the outer body, so that the compressive forces applied as a result of the force acting on the piston in turn act as tensile forces on the inner body by way of the collars and can be absorbed through appropriate bracing of the collars over the inner body.


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