DE2121724C3 - Rack and pinion steering with integrated hydraulic power steering - Google Patents

Description

1 sheet of drawings

Claims (1)

others in the case of small vehicles, d. In other words, in the case of vehicles, claim: with a small track width of importance. This object is achieved according to the invention Rack mounted centrally in the vehicle releases that the pressure chamber surrounds the toothed part of the steering with integrated hydraulic power steering, at 5 racks and the drive pinion that forms the rack that forms the center rod of a pressure chamber in a right and left pressure chamber, three-part tie rod and the outer mer divided by its housing on tie rods at the two rack ends a substantial part of its circumference with mini-articulated, thereby gekennzeich- malspiel is sealingly enclosed and right η et that the pressure chamber the toothed part of the io and left directly at the end of the toothing Hy Rack surrounds and the drive pinion is arranged around the hydraulic piston.
Pressure chamber into a right and a left pressure - The one that was previously separated from the rack at the side chamber divided, whereby it is now also related to a substantial part of its circumference in the space in which the rack is mounted by its housing pressure chamber. The Miuimalspiel is sealingly enclosed, and 15 pinion itself then limits the respectively under pressure that right and left immediately at the end of the standing space to one side.
Toothing hydraulic pistons are arranged. An embodiment according to the invention is shown in the drawing. In it shows
F i g. 1 a rack and pinion steering system, in which the 20 pinion the pressure chamber in a right and a left Subdivided pressure chamber, 2 shows the schematic arrangement of a rack and pinion steering in the vehicle. The present invention relates to a central In the drawings, the housing of a tooth Rack-and-pinion steering with internal rack-and-pinion steering denoted by 1 on the vehicle. There is one in this one grated hydraulic steering aid, in which the toothed rack 2 is mounted and is longitudinally displaceable rod the center rod of a three-part tie rod is moved to the left or right by a pinion 3, forms, and the outer tie rods on the two via left and right tie rods 4 and 5 (Fig. 2), Rack ends are articulated. will move to a left and right If a track lever 6 or 7 is arranged for steering the wheels 8, these steering systems are used Power steering is usually carried out in a coaxial design. Pistons 9 are located inside the housing 1 leads, i.e. the working cylinder of the hydraulic system and 10 arranged at the ends of the toothing the toothed rack lie in one axis, the toothed rack and thus form a thin space. This pressure is then the piston chamber lengthened to one side is in turn driven by the drive pinion 3 in pole. 35 a right pressure chamber 11 and a left pressure The entire length of a rack and pinion steering chamber 12 is divided. The inlets and outlets of the drive for manual operation is approximately 2.5 times the pressure chamber and are denoted by 13 and 14, respectively. That of the length of the toothing of the rack. In the case of ko pinion 3, the pressure space is limited by the fact that the axially arranged hydraulic steering aid is the housing 1 and encloses it in a sealing manner over a substantial part of its transmission length because of the additional working cylinder 4 ° circumference with minimal play,
ders and the required sealing elements min- Aus F i g. 1 it can be seen that the length of the at least 3.5 times the length of the toothing. Steering gear only about, despite the hydraulic power steering The aim of the present invention is to be 2.5 times the tooth length and that Requirement otherwise required by the hydraulic system is about the same length as a manually operated one tion of the housing. This is in particular 45 rack and pinion steering gears.