Brakes – Internal-resistance motion retarder – Including seal or guide
Patent
1994-03-11
1995-12-05
Oberleitner, Robert J.
Brakes
Internal-resistance motion retarder
Including seal or guide
18832219, 267119, 267126, F16F 922
Patent
active
054720710
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase of PCT/EP92/02024 filed Sep. 2, 1992 and based, in turn, on German national application P 41 31 545.6 filed Sep. 21, 1991 under the International Convention.
FIELD OF THE INVENTION
The invention relates to a shock-absorbing strut with an outer guide housing fixed to a vehicle frame, a support element axially slidable and rotatable within the housing for receiving a wheel carrier and provides with hydraulic wheel drive, at least one surge chamber formed by the guide housing and the support element and/or members rigidly connected therewith, in order to brace the chassis with respect to the wheel or a group of wheels and with an oil supply system having an oil feed and an oil return for the hydraulic wheel drive.
BACKGROUND OF THE INVENTION
A shock-absorbing strut is known from Austrian Patent 330 555. Instead of one wheel, the support element can thereby be supported on a group of wheels, as is known from U.S. Pat. No. 4,220,352.
It is further known to supply the hydraulic drive motor with pressure oil via flexible hoses suspended on steerable rocker arms and via hydraulic cylinders supported against the frame of the wheels or wheelset, these hoses running outside the mentioned parts. However in this type of arrangement, especially in a limited space such as in heavy vehicles, particularly in vehicle-mounted cranes, there is the disadvantage of damage possible to and short life of the hoses.
OBJECT OF THE INVENTION
It is the object of the invention to provide a shock-absorbing strut wherein the mentioned drawbacks are avoided and the oil supply for the hydraulic drive is safe, reliable and durable.
SUMMARY OF THE INVENTION
This object is achieved, according to the invention, in that the oil feed line and oil return line run through the shock-absorbing strut, that the oil feed line and the oil return line each have a sealed telescopic connector, whereby a line of each connector is rigidly connected to the guide housing, that the telescopic connectors which are axially movable with respect to the guide housing are connected to a revolving joint which is axially and nonslidably connected with the support element, that the ends facing away from the guide housing of the oil feed line and the oil return line are located in the external part of the revolving joint which is rotationally rigidly connected with the support element and that the telescopic line connectors are each connected with a compensation cylinder, wherein the hydraulic pressure of the hydraulic oil provided for the drive exerts a force on the revolving joint which corresponds to the force exerted in the telescopic line connector, but in the opposite direction.
The fact that the oil feed line and the oil return line pass through the stably designed shock-absorbing strut precludes damage inflicted by external influences. Inside each shock-absorbing strut an axially adjustable telescopic line connector and a revolving joint are provided. Due to these two line connections a firm connection on the shock-absorbing strut is established both with respect to the chassis and, on the other hand, with respect to the foot of the support element and thereby with respect to a hydraulic wheel drive. In order to make sure that the effective frontal surfaces, always present in the telescopic connectors when a hydraulic pressure exits for the drive, have no influence on the support of the shock-absorbing strut, the telescopic line connectors are each connected to a cylinder wherein the hydraulic pressure exerts a force on the revolving joint and thereby on the support element and the wheel, respectively wheel group, which corresponds to the force exerted in the telescopic line connector, but acts in the opposite direction. The total influence of hydraulic pressure for the drive is zero with respect to the support.
The compensation cylinder can have a cylinder housing which is preferably immobile with respect to the guide housing and a piston which is connected via its piston r
REFERENCES:
patent: 3008424 (1961-11-01), Roth
patent: 3391921 (1968-07-01), Axthammer
patent: 3476354 (1969-11-01), Stubblefield
patent: 3567244 (1971-03-01), Hoffman et al.
patent: 4220352 (1980-09-01), Umeda et al.
patent: 4887515 (1989-12-01), Tabata
Dubno Herbert
Krupp Industrietechnik Gesselschaft mit beschrankter Haftung
Oberleitner Robert J.
Schwartz Chris
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