Abstract:
The present invention relates to a steering rack bar, which is one of the important parts for transferring steering force to wheels, when a steering wheel is turned for the steering in an automobile, and more particularly, to a method of manufacturing a steering rack bar for an automobile, which can manufacture the steering rack bar more simply and efficiently, thereby achieving lightness of the steering rack, and a steering rack bar manufactured thereby. The method of manufacturing the steering rack bar for the automobile according to the present invention comprises the steps of cutting a prepared hollow tubular material 10 into a desired length; primarily extruding the cut material to have a desired maximum diameter in the whole; secondary extruding the extruded material so that only a gear portion 14 for forming a rack gear 13 is extruded to reduce an outer diameter thereof thereof; tertiarily extruding one side of the gear portion 14 for forming a plane portion 15; forming a rack gear 13 at the gear portion 14 through a broach working or a hot forging; performing a heat-treatment on the worked rack gear 13 to thereby improve a hardness; and grinding the entire outer diameter of the steering rack bar to make a surface thereof to be neat, and the like.
Abstract:
Die Erfindung betrifft eine Zahnstange (1), die zumindest abschnittsweise hohl ausgebildet ist und deren Längsachse sich parallel zu einer Längsrichtung (39) erstreckt und die in ihrem hohlen Bereich eine Wandung (3) umfasst, die die Längsachse (2) der Zahnstange (1) in einer Umfangsrichtung (4) umschließt und in mindestens einem Teilbereich (5) eine Verzahnung (6) aufweist. Erfindungsgemäß ist in Umfangsrichtung (4) von der Verzahnung (6) beabstandet mindestens eine lokale Schwächung (7, 8, 9, 10, 11, 12) und/oder Haltekante in der Wandung (3) ausgebildet, die sich bezogen auf die Längsrichtung (39) der Zahnstange (1) zumindest über einen Teil der Länge der Verzahnung (6) neben dieser erstreckt.
Abstract:
Die Erfindung betrifft ein Verfahren zur Herstellung einer Lenkzahnstange (100), die einen Verzahnungsabschnitt (110) mit einer Lenkverzahnung (115) und einen Spindelabschnitt (120) mit einer Kugelumlaufspindel (125) aufweist, umfassend: - Bereitstellen eines stangenartigen Rohlings aus einem massiven Metallmaterial; - Aushöhlen des Spindelabschnitts (120) durch einseitiges Tieflochbohren, wobei eine tiefe, den Spindelabschnitt (120) axial durchragende Sacklochbohrung (130) erzeugt wird; und - Erzeugen der Kugelumlaufspindel (125) am hohlen Spindelabschnitt (120) durch spanende Bearbeitung. Die Erfindung betrifft ferner eine mit diesem Verfahren hergestellte Lenkzahnstange (100) für ein Kraftfahrzeug, die einen Verzahnungsabschnitt (110) mit einer Lenkverzahnung (115) und einen Spindelabschnitt (120) mit einer Kugelumlaufspindel (125) aufweist, wobei trotz einstückiger Herstellung der Verzahnungsabschnitt (110) massiv und der Spindelabschnitt (120) hohl ausgebildet ist.
Abstract:
The invention relates to a method for producing a rack (5) for a rack-and-pinion steering in motor vehicles, which method consists of the following steps: a slug (18) for the rack (5) has a shape which differs from that of a regular cylinder at least in the area of the teeth. The size and shape of the cross-section of said slug (18) is chosen so that the outline of the finished rack (5) in the toothed area (7) does not extend beyond a tooth trace defined by the dimensions of pieces adjoining the rack-and-pinion steering. The rack (5) is shaped from the slug (18) by tumble forging. After tumble forging has been completed, the rack (5) has a convex or concave longitudinal profile, which serves to support the moments of tumbling during tumble forging, in its toothed area (7) outside the teeth.
Abstract:
Provided are a method of manufacturing a hollow rack bar including a rack portion that is engaged with a pinion gear and faces supported by a yoke easily and accurately, and the hollow rack bar. The hollow rack bar (10) includes: the rack portion (21) engaged with the pinion gear (29); and the supported faces (23) provided on a back side of teeth of the rack portion (21) and supported by the yoke (31). The rack portion (21) is formed by locating a toothed mold (39) on an outer face of a circular tube material, and inserting a cored bar (41) into the circular tube material to pressurize an inner face, thereby transferring a shape of the toothed mold (39). The supported faces (23) are formed by removal processing or deformation processing of a back side of the teeth rack portion (21) of the circular tube material.
Abstract:
Verfahren zum Herstellen einer hohlen Zahnstange ( 3 ) für eine Zahnstangenlenkung für Kraftfahrzeuge mit folgenden Schritten: - In den Hohlraum eines Rohlings (1) für die Zahnstange wird ein Stab (2) eingeführt, dessen Werkstoff eine geringere Dichte oder einen geringeren Schmelzpunkt als der Werkstoff des Rohlings aufweist; - Die Zahnstange wird durch Taumelschmieden aus dem Rohling umgeformt; - Wenn der Werkstoff des eingebrachten Stabes einen geringeren Schmelzpunkt als der Werkstoff des Rohlings aufweist, kann der Stab durch eine Wärmebehandlung ausgeschmolzen werden.
Abstract:
A manufacturing method for a hollow rack bar made of a hollow shaft material and including a toothed section which has a rack on an outer surface and a shaft section which is formed thinner than the toothed section, the manufacturing method includes drawing the hollow shaft material by using a die and a plug, and preforming regions of the hollow shaft material including a toothed section forming region configured to form the toothed section and a shaft section forming region configured to form the shaft section to have thicknesses according to the regions respectively, and forming the rack at the toothed section forming region of the hollow shaft material which is preformed.
Abstract:
A rack bar (1, 21, 31) includes a shaft member (S1) having a toothed section (2, 12, 22). The toothed section (2, 12, 22) has a plurality of rack teeth (3, 13, 23), and extends over a portion of an entire length of the shaft member (S1) along a longitudinal direction of the shaft member (S1). The shaft member (S1) has a grinding-finished outer peripheral surface extending over the entire length of the shaft member (S1) including the toothed section (2, 12, 22). A method for manufacturing the rack bar (1, 21, 31) includes forming the toothed section (2, 12, 22) by plastic working and grinding the outer peripheral surface to improve shape accuracy.
Abstract:
A hollow rack bar (10) and a method of manufacturing the hollow rack bar are provided. The hollow rack bar (10) includes a hollow blank pipe portion having a uniform wall thickness, and a rack toothed portion. The rack toothed portion includes teeth, a flat portion (33) having a flat surface (35) and arranged side by side with the teeth in a direction along a center axis of the blank pipe portion, and a slanted portion (34) provided at an end of the flat portion (33) with respect to a direction perpendicular to the center axis and arranged to be lower than the flat portion. A length (t1) of the slanted portion (34) projected on a straight line perpendicular to the center axis and parallel to the surface of the flat portion is longer than zero and equal to or shorter than the wall thickness (t) of the blank pipe portion.