Land vehicles – Wheeled – Running gear
Reexamination Certificate
1999-04-06
2001-07-10
Dickson, Paul N. (Department: 3618)
Land vehicles
Wheeled
Running gear
C280S005506, C280S005507
Reexamination Certificate
active
06257603
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a driving stabilizer for motor vehicles.
RELATED TECHNOLOGY
Driving stabilizers with a rotary actuator located in the link of the spider parts, which support the stabilizer arms, are known from European Patent Application No. 0428439 A1. The spider parts are non-rotatably held in a form-fitting manner in receptacle bushings of the front end parts by a gearing, and the receptacle bushings are components of two housing halves of the rotary actuator, which axially overlap and are axially secured via a support, which includes the bearing collars and a swivel nut securing the bearing collars against each other and is provided on the outer periphery of the receptacle bushings so they can rotate in relation to one another. The two overlapping housing halves together delimit an inner space, into which a cog-like extension projects from a front face end of one support half. The diameter of this extension is smaller than the diameter of the inner space and it delimits an annular space, which extends to the outer diameter of the inner space. An annular piston with a piston bushing which follows the annular piston axially, overlaps the cog at its free end and is closed by a bottom part, is located in the annular space, so that the piston bushing has the annular piston at one end and the central piston surface at the other end; the annular piston and the central piston surface form the boundaries of working spaces with their sides facing away from one another. Such a rotary actuator has a relatively complicated design, has a relatively large length and its design requires the entire driving stabilizer to be removed for repair and assembly.
Swivel motors for driving stabilizers are also known (German Patent No. 195 33 864 C1) in which the outer body and the inner body delimit an annular space, which is subdivided into the working chambers by axial wings associated with the outer body and the inner body and is axially closed by covers. The covers are non-rotatably connected to the outer body and one of the covers is provided with a neck, into which a spider part of the driving stabilizer is axially inserted so that it is non-rotatably secured. The opposite cover is traversed by the other spider part of the driving stabilizer, which is associated with the inner body and engages in a central receptacle of the inner body and non-rotatably secured against it. Such a swivel motor is relatively short, yet its repair is associated with a relatively high cost, since there is considerable overlapping between the spider parts of the driving stabilizer and the swivel motor. Furthermore, such a design requires a considerable amount of sealing.
German Patent Application No. 43 37 813 A1 has the same basic construction. The driving stabilizer spider part associated with the outer body has a flange, which is welded to a cover in turn welded to the outer body. The flange of the opposite spider part of the driving stabilizer is bolted onto a flange, which is connected to the inner body of the swivel motor. With this design, there are fewer sealing problems due to the plurality of welds. However, the swivel motor represents a disposable unit barely accessible for repairs, which is connected to one of the spider parts of the driving stabilizer by welding.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a driving stabilizer with a respective rotary actuator resulting in a more compact design and improved conditions for assembly.
The present invention provides a drive stabilizer for motor vehicles having lateral, swivelable stabilizer arms and spider parts (
2
,
3
) located in their transversal connections, which are connected via a rotary actuator (
1
) located between them, which is coaxial with the spider parts (
2
,
3
) and includes mutually rotatable, adjusting elements (outer body
7
, inner body
8
), which are axially secured with respect to one another, and are non-rotatably connected to one of the spider parts (
2
,
3
) via the respective end face part (flange
4
,
5
) of the rotary actuator (
1
), wherein the end parts (flange
4
,
5
) of the rotary actuator (
1
) are formed by the ends of the spider parts (
2
,
3
) designed as connecting flanges (
4
,
5
) and are adjacent to a central part (
6
) of the rotary actuator (
1
) as covers, this central part (
6
) including an annular jacket that forms the outer body (
7
) of the rotary actuator (
1
), spanning the gap between the covers (flange
4
,
5
).
According to the present invention the front end of the rotary actuator is formed by covers, which form at the same time connecting flanges for the spider parts and are supported by the spider parts as connecting flanges. Thus the rotary actuator becomes an insertable element with which the flanges are to be connected in the usual manner. The double function of the flanges as connecting parts and cover parts reduces the complexity and the required length. If the assembly unit located between the covers and forming a central part has an annular jacket as an outer body, which, as a spacer, forms the transition between the covers radially outward and thus forms the housing of the rotary actuator together with the covers, this also contributes to reducing the complexity of the design.
According to the present invention, the cover-building flanges are preferably permanently attached to the spider parts, which can be achieved by forging them together, but can also be preferably achieved by welding.
For the overall design of the rotary actuator, it has proven to be particularly advantageous if the outer body forms the axial and radial support for an inner body arranged coaxially, which is also non-rotatably attached to one cover. Thus a very compact axial length is achieved, where both covers can be basically connected in the same manner.
It is particularly convenient if the outer body and the inner body end faces are flush with one another.
If the outer body forms the support for the inner body as an annular jacket, it is particularly advantageous if the outer body has axially offset shoulders radially inside, against which the inner body is axially supported, so that the inner body is supported and axially secured in the outer body through the axial bracing. The inner body is preferably supported via radial ring collars, provided at the end face, against the axial and radial shoulder surfaces, so that an annular space is delimited in a simple manner against the annular jacket in the case of a central piece of the inner body located between the ring collars. The adjustment means, including an axially adjustable and, in particular, hydraulically actuatable, piston, designed as an annular piston, can be arranged in this annular space. The annular piston is conveniently provided with a guide bushing extending axially, which is virtually surrounded, at one end, by the annular piston, and whose radially inner and radially outer gearings engage with the corresponding gearings of the inner and outer bodies in the area that is farther away from the annular piston. These gearings are designed as helical gearings angled in opposite directions, so that the axial movement of the annular piston results in a rotation of the inner body with respect to the outer body.
In view of a goal of making operating pressures as low as possible, is desirable to make the piston surfaces as large as possible. Accordingly, the distance between the inner and outer bodies in the area of the annular piston is greater than in the area of the teeth, and the ring collar of the annular body that is next to the annular piston and delimits one of the working spaces separated by it in the front has a greater diameter than the other ring collar of the annular piston. As a result, approximately the same size of bolt ring diameter is available for bolting on the cover-forming flanges despite the same or basically the same outer diameter of the annular jacket. In particular, the available room allows the required hydraulic connections to be provided axially and
Busch Werner
Rösener Jörg
Speier Wolfgang
Szell Thomas
Daimler-Chrysler AG
Dickson Paul N.
Fleming Faye M.
Kenyon & Kenyon
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