Toothed-Rack Power-Assisted Steering in Particular for Motor Vehicles

1. A tooth-rack, power-assisted steering for motor vehicles which comprises: a pinion rotatably seated in a steering housing; a guided toothed-rack axially displaceable in the steering housing and maintained in engagement with the pinion by a spring-loaded pressure element; a power assist including a servo-motor provided with a piston rod and two work chambers, and wherein the piston rod is drivingly connected with the toothed-rack; a control device for controlling the flow of a pressure medium to and from the servo-motor, and which can be adjusted as a function of a movement of the pinion; wherein the two 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 connecting elements having an undercut, the work lines, a pressure line from a servo-pump, and a return line to a reservoir all being maintained on the connecting elements by fastening clasps, wherein each work, pressure and return line is cylindrical and includes a ring-shaped section, which is limited in its axial length and has an increased diameter as compared to the diameter of the remainder of the work, pressure and return lines, said ring-shaded section being in the form of an annular collar spaced from an adjacent end of the line; wherein each work, pressure and return line is held by a respective fastening clasp which extends over and engages the collar and engages the undercut on the connecting element; wherein the fastening clasp includes an essentially rectangular, flat base having at least two sides and an elongate slit open in the direction of one side of the base and having two long sides and one inner side, the inner side of the elongate slit being provided with a curvature matched to the curvature of the work, pressure and return lines such that the fastening clasp can be mounted from any direction on said work, pressure and return lines, the base further including two tab-shaped extensions edge-formed out of the base to be essentially parallel to the long sides of the elongate slit, which extensions are resilient in both the direction perpendicular to the base and the direction perpendicular to the long sides of the elongate slit, and wherein the fastening clasp is elastically deformed after mounting, being fastened on the connecting element due to pre-stress of the tab-shaped extensions such that the tab-shaped extensions biasedly engage the undercut of the connection in the direction perpendicular to the long sides of the elongate slit and biasedly engage the collar in the direction perpendicular to the base, whereby the work, pressure and return lines are firmly secured on the connecting element in the axial direction and the fastening clasp is secured against easy loosening or dismounting from the connecting element.

2. A toothed-rack, power-assisted steering in accordance with claim 1, wherein the two tab-shaped extensions together form a circular opening matched to a cylindrical contour of the undercut of the connecting elements for mounting and fastening the fastening clasp on the connecting elements.

3. The toothed-rack, power-assisted steering of claim 2, wherein the circular opening is open by opposed edges of the tab-shaped extensions toward the open side of the elongate slit for mounting and fastening the fastening clasp on the connecting element; and wherein the opposed edges extend in the direction toward the open side of the elongate slit and away from each other sufficiently far that a space between respective proximal ends of the edges adjacent a curvature of the circular opening is less than the diameter of the curvature of the circular opening.

4. The toothed-rack, power-assisted steering of claim 3, wherein the fastening clasp further comprises a third extension on its side opposite the open side of the elongate slit and that all three extensions together form the circular opening for mounting and fastening the fastening clasp on the connecting element so that, after mounting, the fastening clasp is locked on the connecting elements.

5. A tooth-racked, power-assisted steering in accordance with claim 4, wherein the work, pressure and return lines are guided in the cylindrical undercut of the connecting element and sealed by an O-ring.