Planetary gear with an extruded planetary pin with integrated assembly orientation feature

Abstract

Planetary gear (1) with a planetary pin (2), wherein the planetary gear (1) has a first and a second support cheek (3, 4) and the planetary pin (2) is received in a rotationally fixed manner in the first and / or in the second support cheek (3, 4), wherein the rotationally fixed reception between at least one of the support cheeks (3, 4) and the planetary pin (2) is carried out by a material displacement from the corresponding support cheek (3, 4) itself, characterized in that the planetary pin (2) is extruded and an orientation embossing (6) is formed within a central recess (5) of the planetary pin (2) formed by the extrusion process, wherein the orientation embossing (6) is placed on a base (8) of a central recess (5) designed as a blind hole.

Description

DE 10 2016 210 526 A1 discloses a planetary gear bolt for use in a planetary gear transmission, for example a spur gear differential of a motor vehicle, between a planetary carrier and a planetary gear, having a first end and an opposite second end, an opening extending from one end along the longitudinal axis of the bolt into the latter, an assembly marking in the manner of a recess being present.DE 10 2016 210 528 A1 shows a manufacturing method of a planetary gear transmission bolt in which a bolt, preferably with a circular outer contour in cross section, is created from a blank, wherein an opening extending from one end of the bolt in the longitudinal direction is introduced into the bolt.JP 2005-147 285 A shows a planetary bolt which is fixed to the respective planetary carrier cheek by caulking the planetary carrier cheeks.It is an object of the invention to provide an improved planetary pin for a planetary gear.According to the invention, the object is achieved by an orientation embossing directly in the blank of the planetary pin during extrusion without additional machining.Thus, a planetary gear with a planetary bolt is present, wherein the planetary gear has a first and a second carrier cheek and the planetary bolt is held in the first and / or in the second carrier cheek in a rotationally fixed manner, wherein the rotationally fixed holding between at least one of the carrier cheeks and the planetary bolt is carried out by a material displacement from the corresponding carrier cheek itself, wherein the planetary bolt according to the invention is extruded and an orientation embossment is formed within a central recess of the planetary bolt formed by the extrusion process.According to the invention, the orientation embossment is placed on a base of a central recess designed as a blind hole. This prevents the alignment tool from colliding with the caulking tool. It is even made possible that both production steps can be carried out almost simultaneously.The planetary bolt has at its one end at the edge between the end face and the circumferential surface partial or circumferential chamfers for the caulking in the planetary carrier. The material of the planet carrier is displaced and moved into the region of the chamfer. The planetary bolt is thus secured and fastened in the planetary carrier.If the partial chamfers are used for circumferential alignment of the planetary bolt in its receptacle of the planetary carrier, unreliability exists in maintaining the circumferential alignment, because the alignment tool must make contact with the caulking tool. According to the invention, therefore, their alignment is effected via the orientation embossing according to the invention, so that the tool can press the material from the planet carrier into the region of the chamfer at the correct point.Advantageously, the orientation embossment is shaped in the form of a triangle, wherein the three embossed surfaces of the triangle serve as a driver for the alignment tool. Thus, the alignment tool can reliably engage the planetary bolt and rotate it into the target position.In one embodiment of the invention, both carrier cheeks form a rotationally fixed receptacle in each case with the planetary bolt.In a further embodiment, one of the carrier cheeks forms a rotationally fixed receptacle with the planetary bolt, while the other carrier cheek has a receptacle in the form of a blind hole for the planetary bolt, into which the end of the planetary bolt is inserted.A further embodiment provides that the planetary bolt is received in a rotationally fixed manner at only one end of the planetary bolt. The caulking at only one end of the planetary bolt is sufficient to hold it reliably in the planetary carrier.Alternatively, the orientation embossment is advantageously placed on an inner lateral surface of the central recess.Further embodiments of the invention are explained in more detail in the figures. They show with: FIG. 1 shows a planetary bolt according to the invention in a perspective, uncut view, FIG. 2 shows the planetary bolt according to FIG. 1 in a sectional view, FIG. 3 shows the planetary bolt according to FIG. 1 with a view to its end face, and FIG. 4 shows the planetary bolt according to FIG. 1, which is installed in a planetary gear.FIG. 1 shows a planetary bolt 2 according to the invention in a perspective, uncut view. The planetary bolt 2 has at its one end at the edge 9 between the end face 10 and the circumferential surface 11 partial or circumferential chamfers 12 for the caulking in the planetary carrier 3, 4. The material of the planet carrier 3, 4 is displaced and moved into the region of the chamfer 12. The planetary bolt 2 is thus secured and fastened in the planetary carrier 3, 4.FIG. 2 shows the planetary bolt 2 according to FIG. 1 in a sectional view. The central recess 5, which is designed as a blind hole and has a bottom 8 approximately centrally along the axial length of the planetary bolt 2, can be seen. The bottom 8 divides the planetary bolt 2 into two regions, one with the central recess 5 as a blind hole and one on the side of the bottom opposite the end face 10 likewise into a recess in the form of a blind hole. The orientation embossment 6 is introduced into the base 8, here in the form of an isosceles triangle. A circular ring surface of the bottom 8 remains around the orientation embossment 6, so that the alignment tool 13 can be located axially, as described in more detail in FIG. 4 and recognizable in the associated illustration.FIG. 3 shows the planet pin 2 according to FIG. 1 with a view of its end face 10. The geometric center of gravity of the triangle lies on the axis of symmetry of the planetary bolt 2, i.e. in the center in this viewing direction.FIG. 4 shows the planetary bolt 2 according to FIG. 1, which is installed in a planetary transmission 1. The alignment tool 13 penetrates into the central recess 5 and is guided by the inner lateral surface 7 until the alignment tool 13 comes to rest in the axial direction on the base 8 and engages in the alignment embossment 6. Now the planet pin 2 can be rotated about its longitudinal axis until the chamfers 12 are in the correct position with respect to the planet carrier 3. Subsequently, the material of the planet carrier 3 can be pressed into the chamfers 12 of the planet bolt 2 so that the planet bolt 2 is secured in the planet carrier 3.List of reference characters1 Planetary gear 2 Planetary bolt 3 First carrier cheek 4 Second carrier cheek 5 Central recess 6 Orientation embossing 7 Inner lateral surface 8 Bottom 9 Edge 10 End surface 11 Lateral surface 12 Chamfer 13 Alignment tool

Claims

Planetary gear (1) with a planetary pin (2), wherein the planetary gear (1) has a first and a second carrier cheek (3, 4) and the planetary pin (2) is held in a rotationally fixed manner in the first and / or in the second carrier cheek (3, 4), wherein the rotationally fixed holding is carried out between at least one of the carrier cheeks (3, 4) and the planetary pin (2) by a material displacement from the corresponding carrier cheek (3, 4) itself, characterized in that the planetary pin (2) is extruded and an orientation embossment (6) is formed within a central recess (5) of the planetary pin (2) formed by the extrusion process, wherein the orientation embossment (6) is placed on a base (8) of a central recess (5) formed as a blind hole.Planetary gear (1) according to claim 1, characterised in that both carrier cheeks (3, 4) form a rotationally fixed receptacle with the planetary bolt (2).Planetary gear (1) according to claim 1, characterised in that one of the carrier cheeks (3, 4) forms a non-rotatable receptacle with the planetary bolt (2), while the other carrier cheek (3, 4) has a receptacle in the form of a blind hole for the planetary bolt (2), into which the end of the planetary bolt (2) is inserted.Planetary gear (1) according to one of the preceding claims, characterized in that the planetary bolt (2) is received in a rotationally fixed manner at one end of the planetary bolt (2).

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