Motor vehicles – Steering gear – With fluid power assist
Patent
1996-11-05
1999-05-18
DePumpo, Daniel G.
Motor vehicles
Steering gear
With fluid power assist
24457, 411523, 411524, 285205, 285305, B62D5/22
Patent
active
059042214
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a toothed-rack, power-assisted steering, in particular for motor vehicles. A pinion is rotatably seated in a steering housing of such power-assisted steering. A toothed rack is guided, axially displaceable, in the steering housing. A servo motor, whose piston rod is drivingly connected with the toothed rack, is used for the power assist. A control device for controlling the pressure medium to and from the servo motor can be adjusted as a function of a movement of the pinion. The two work chambers of the servo motor are connected with the control device via two work lines, which are connected to a cylinder of the servo motor and to the control device by means of connecting elements and which are maintained on the connecting elements by fastening elements, the same as the pressure line from a servo pump and a return line leading to a reservoir.
In accordance with the invention, the lines are fastened on the connecting elements of the servo motor by means of fastening clasps under prestress. The fastening clasps have at least one elastic clamping member which engages an undercut at the free end of the connecting element. In order to prevent easy loosening or too easy disassembly, the fastening clasp has at least one resilient extension which encloses the connecting element and in this way maintains the fastening clasp in a locked manner on the fastening element after assembly.
SUMMARY OF THE INVENTION
It is the object of the invention to further improve the toothed-rack power-assisted steering in accordance with the invention.
This object is attained by means of the toothed-rack power-assisted steering. Useful and advantageous embodiments of the invention are recited in the specification.
In accordance with the invention, the fastening clasp has an essentially rectangular and flat base with an elongated slit, open in the direction of one side of the base, which is provided on its other side with a curvature matched to the line for mounting the fastening clasp from any arbitrary side of the line. In addition, the fastening clasp has two extensions, which are essentially parallel with the long sides of the elongated slit, have been edge-formed out of the base and which have been designed to be resilient in both the direction perpendicularly with the base and in the direction perpendicularly with the long sides of the elongated slit. Together the two extensions form a circular opening, matched to the contour of the undercut of the connecting elements, for mounting and fastening the fastening clasp on the connecting element. This opening is open toward the open side of the elongated slit. Its curvature extends in the direction toward the open side of the elongated slit sufficiently far so that the space between the two ends of the curvature is less than the diameter of the curvature, so that in the course of mounting the fastening clasp the two extensions retreat resiliently from the connecting element and after mounting again take up their original shape and position. Because of this, the extensions partially enclose the connecting element, so that the fastening clasp is securely held on the connecting element, even at high operating pressures of approximately 150 bar.
The fastening clasp usefully has a third extension between the two lateral extensions. The wrapping of the connecting element is improved by this.
The invention will be explained in more detail in what follows by means of an exemplary embodiment represented in the drawings.
BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1, a longitudinal section through the toothed-rack, power-assisted steering in accordance with the invention;
FIG. 2, a partial cross section through the toothed-rack, power-assisted steering in FIG. 1 in the area of the pinion and the pressure element;
FIG. 3, an enlarged section of the cylinder tube in accordance with the arrow III in FIG. 1;
FIG. 4, a top view of the fastening clasp only in accordance with the arrow IV in FIG. 3; and
FIG.
REFERENCES:
patent: 3628768 (1971-12-01), Hutt
patent: 4938510 (1990-07-01), Gmeiner et al.
patent: 5046765 (1991-09-01), Usui
patent: 5092300 (1992-03-01), Imoehl et la.
patent: 5211427 (1993-05-01), Washizu
patent: 5765877 (1998-06-01), Sakane et al.
Bieber Jurgen
Breitweg Werner
Rupp Arthur
DePumpo Daniel G.
ZF Friedrichshafen AG
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