DE102018120272A1 - One-piece planet carrier - Google Patents

Abstract

The invention relates to a planet carrier (1) for a drive train of a motor vehicle, with a one-piece base body (2), the base body (2) comprising a first support cheek (3), spaced along a longitudinal axis (5) from the first support cheek (3) arranged second carrier cheek (4) and a plurality of web regions (6) which are arranged distributed in the circumferential direction and which connect the carrier cheeks (3, 4) to one another, and wherein the second carrier cheek (4) is formed by several, each forming a web region (6) directly with it and welded wings (7) is formed, each wing (7) in an undeformed initial state of a metal sheet blank (8) forming the planet carrier (1) having a funnel-shaped base section (9).

Description

The invention relates to a planet carrier for a drive train of a motor vehicle, such as a car, truck, bus or other commercial vehicle, with a one-piece base body, the base body being a first support cheek, a second support cheek spaced along a longitudinal axis and a plurality in the circumferential direction Distributed arranged web areas connecting the carrier cheeks, and wherein the second carrier cheek is formed by a plurality of wings, each forming a web area directly with it, formed and welded to one another.

Generic prior art is from the EP 2 489 903 A1 is known with which a planet carrier with a base body from a sheet metal part is known. It has turned out to be a disadvantage of these versions, however, that their torsional rigidity often cannot meet all requirements. These planet carriers are often relatively complex to manufacture in many individual process steps.

It is therefore the object of the present invention to remedy the disadvantages known from the prior art and in particular to provide a planet carrier which is easier to manufacture and has increased torsional rigidity.

This is achieved according to the invention in that, in an undeformed initial state of a metal sheet blank forming the planet carrier, each wing has a base section which widens in a funnel shape.

This funnel-shaped base section provides a plurality of stable support regions which face one another in the circumferential direction and are welded to one another in the deformed state and which significantly increase the rigidity of the planet carrier. As a result, both the first carrier cheek and the second carrier cheek each have at least one ring region that completely encircles in the circumferential direction.

Further advantageous designs are claimed with the subclaims and explained in more detail below.

Accordingly, it is also advantageous if the first carrier cheek has a first ring region and a plurality of tab-shaped first embrasure regions offset / distributed in the circumferential direction and projecting towards a radial outside of the ring region. This results in a stable and material-optimized carrier training.

In addition, it is advantageous if, in the initial state, in a circumferential direction adjoining the base section adjoins a (second) embrasure area forming a receiving hole for a planet bolt. This embrasure area can be integrated directly into a later shaped (second) ring area of the second carrier cheek. This further reduces the manufacturing effort.

Furthermore, it is advantageous if the second carrier cheek, when the planet carrier is in the fully formed state, has a second ring region which is implemented by the wings, with a plurality of second embrasure regions projecting towards a radial outside of the second ring region. Thus, the carrier cheeks are implemented essentially the same / mirror-inverted and the planet carrier is particularly stable.

In other words, a one-piece planet carrier is thus implemented according to the invention.

The invention will now be explained in more detail with reference to figures.

• 1 eine perspektivische Ansicht eines erfindungsgemäßen Planetenträgers in einem fertig ausgeformten Zustand, wobei mehrere einzelne eine zweite Trägerwange des Planetenträgers bildende Flügel durch Schweißnähte miteinander verbunden sind,
• 2 eine Draufsicht auf einen noch nicht fertig ausgeformten Planetenträger in einem Ausgangszustand, in dem die Konturen des Planetenträger zwar bereits fertig ausgebildet sind, mehrere Flügel jedoch noch nicht zum Ausbilden mehrerer Stegbereiche sowie der zweiten Trägerwange umgebogen und miteinander verschweißt sind,
• 3 eine perspektivische Darstellung des fertig ausgebildeten Planetenträgers, ähnlich zu 1,
• 4 eine Draufsicht auf den Planetenträger, ähnlich zu 2,
• 5 eine Vorderansicht des fertig ausgebildeten Planetenträgers,
• 6 eine Längsschnittdarstellung des Planetenträgers entlang der in 5 mit „VI-VI“ gekennzeichneten Schnittlinie,
• 7 eine Draufsicht auf einen Metallblechrohling, der zur Herstellung des Planetenträgers dient, und
• 8 eine perspektivische Darstellung eines Teils eines Planetengetriebes, in dem der Planetenträger nach 1 eingesetzt ist.

Show it:

• 1 2 shows a perspective view of a planet carrier according to the invention in a fully formed state, several individual wings forming a second carrier cheek of the planet carrier being connected to one another by welds,
• 2 3 shows a plan view of a planet carrier which has not yet been fully formed in an initial state in which the contours of the planet carrier have already been formed, but several vanes have not yet been bent and welded to form a plurality of land regions and the second carrier cheek,
• 3 a perspective view of the finished planet carrier, similar to 1 .
• 4 a plan view of the planet carrier, similar to 2 .
• 5 a front view of the fully formed planet carrier,
• 6 a longitudinal sectional view of the planet carrier along the in 5 With " VI-VI “Marked cutting line,
• 7 a plan view of a sheet metal blank that is used to manufacture the planet carrier, and
• 8th a perspective view of part of a planetary gear, in which the planet carrier 1 is inserted.

The figures are only schematic in nature and serve only to understand the invention. The same elements are provided with the same reference symbols.

In 1 is a planet carrier according to the invention 1 illustrated. The planet carrier 1 is according to 8th in its operating state part of a planetary gear, which is only illustrated in sections here. The planet carrier 1 typically serves to accommodate multiple planet gears 17 what planet gears 17 each on a planet pin 11 rotatable relative to the planet carrier 1 are included.

The planet carrier 1 has two along a longitudinal axis 5 spaced-apart (first and second) carrier cheeks 3 . 4 on. Every planet bolt 11 is in a receiving hole 10 the first beam 3 as well as a receiving hole 10 the second beam 4 inserted and there with the respective carrier cheek 3 . 4 firmly connected. In the axial direction between the carrier cheeks 3 . 4 is the planet gear 17 rotatable on the planet pin 11 arranged. In this version, as well as particularly well in 1 recognizes each carrier cheek 3 . 4 a circumferential ring area 14 . 15 on. The receiving holes 10 are each in one of the ring area 14 . 15 Radial outward protruding perforation area 12 . 13 educated.

In 2 is the planet carrier 1 illustrated in an initial state before a forming process. The one-piece planet carrier 1 has a one-piece body 2 on. The basic body 2 includes both the two cheeks 3 . 4 as well as several the two carrier cheeks 3 . 4 connecting web areas 6 , The dock areas 6 , as in 8th can be seen, are in the fully formed state in the circumferential direction between the respective reveal areas 12 . 13 implemented. The basic body 2 is made from an essentially square sheet metal blank 8th formed, which preferably has a constant thickness t ( 7 ). Of 7 to 2 can be reached by looking at the outer contour of the body 2 worked out, such as punching out or cutting out in some other way.

In the initial state after 2 is the first circumferential (disc-shaped) beam 3 already fully trained. The first beam 3 therefore shows its already finished (first) ring area 14 as well as several to a radial outside 16 of the first ring area 14 protruding tab-shaped first reveal areas 12 on. The second beam 4 as well as the dock areas 6 are by means of several, here three, arranged in the circumferential direction arranged wings 7 implemented, which are not yet fully bent and connected to each other in the circumferential direction. The wings 7 extend to in the initial state 2 in the radial direction from the first ring area 14 out to the outside. Every wing 7 has a base section 9 on. The basic section 9 extends from the first ring area 14 from funnel-shaped in the radial direction to the outside. Connects to the base section in the circumferential direction 9 a (second) reveal area 13 the second beam 4 on. The second reveal area 13 is already with the receiving hole 10 Mistake. The wings 7 are equally designed among themselves.

Finally the wings 7 reshaped in the axial direction and in the radial direction such that the second carrier cheek 4 , as in 1 to recognize, trains. The two wings 7 are welded together at their adjacent system edges. In 1 are multiple welds 18 between the wings 7 illustrated. In the fully welded state, a circumferential second ring area is formed 15 as well as the fully formed second reveal areas 13 the second beam 4 out. The planet carrier 1 is also in connection with the 3 to 6 clearly visible.

In other words, a one-piece planet carrier is thus according to the invention 1 by bending several sheet metal tabs (wing 7 ) implemented. From the 2D design (initial state) you get to the fully formed three-dimensional and welded planet carrier in relatively few forming steps 1 ,

LIST OF REFERENCE NUMBERS

1

planet carrier

2

body

3

first beam

4

second beam

5

longitudinal axis

6

web region

7

wing

8th

blank

9

base portion

10

receiving hole

11

planet shaft

12

first reveal area

13

second reveal area

14

first ring area

15

second ring area

16

outside

17

planet

18

Weld

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 2489903 A1 [0002]

Claims (4)

Planet carrier (1) for a drive train of a motor vehicle, with a one-piece base body (2), the base body (2) comprising a first support cheek (3), a second support cheek (3) spaced along a longitudinal axis (5) from the first support cheek (3) 4) and a plurality of web regions (6) which are arranged distributed in the circumferential direction and which connect the carrier cheeks (3, 4) to one another, and wherein the second carrier cheek (4) is formed by a plurality of wings, each with a web region (6), which are directly formed, formed and welded to one another (7) is formed, characterized in that, in an undeformed initial state of a sheet metal blank (8) forming the planet carrier (1), each wing (7) has a funnel-shaped base section (9). Planet carrier (1) after Claim 1 , characterized in that the first carrier cheek (3) has a first ring region (14) and a plurality of tab-shaped first embrasure regions (12) which are offset in the circumferential direction and protrude from a radial outside (16) of the first ring region (14). Planet carrier (1) after Claim 1 or 2 , characterized in that in the initial state in a circumferential direction adjoining the base section (9) adjoins a perforated area (13) forming a receiving hole (10) for a planet bolt (11). Planet carrier (1) according to one of the Claims 1 to 3 , characterized in that the second carrier cheek (4) in the fully shaped state of the planet carrier (1) has a second ring region (15) implemented by the wings (7), several second embrasure regions (13) to a radial outside (16) of the protrude from the second ring area (15).

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