DE102022107091A1 - Planet carrier part made of sheet metal with a plugged connection using sheet metal bridges, planet carriers and planetary gears - Google Patents

Abstract

The invention relates to a planet carrier (1) with two carrier cheeks (2, 3) made of sheet metal for supporting planetary gears (4) via planetary bolts (5), at least one bridge (6) made of sheet metal having at least one first projection (7). is inserted into a receiving hole (9) of the one carrier cheek (2) and with at least one second projection (8) into a receiving hole (10) of the second carrier cheek (3) and the two projections (7, 8) are deformed like a rivet, the Bridge (6) has a web-like spacer between the two projections (7, 8), which keeps the two support cheeks (2, 3) spaced apart, the bridge being shaped like a shell. The invention also relates to a planetary gear (18) with such a planet carrier (1).

Description

The invention relates to a planet carrier with two carrier cheeks made of sheet metal for supporting planetary gears via planetary bolts, with at least one bridge made of sheet metal being inserted with at least a first projection into a receiving hole in one carrier cheek and with at least a second projection in a receiving hole in the second carrier cheek and the two projections are deformed like a rivet, the bridge between the two projections having a web-like spacer which keeps the two support cheeks spaced apart from one another.

Planet carriers with connecting webs made of sheet metal are already known from the prior art. This is how it reveals DE 10 2018 107 359 A1 a planet carrier with a first carrier area, a second carrier area spaced along a longitudinal axis relative to the first carrier area and connected to the first carrier area via at least one connecting web, and a plurality of planetary bolts received on the carrier areas and extending between the carrier areas for the rotary mounting of a planetary gear, wherein the connecting web is made of sheet metal separately from the support area, the connecting web having two fastening elements riveted together and designed as identical parts, a first fastening element being riveted to the first support area and a second fastening element being riveted to the second support area.

The patent applicant is already testing planetary carriers with two carrier shells, the carrier shells each having planetary gear sections and connecting sections, further using planetary gears, the planetary gears being arranged in the planetary gear sections, with several riveting devices, the riveting devices connecting the carrier shells in the connecting sections, the connecting sections of at least one of the carrier shells are designed as forming sections, which are recessed relative to the planet gear sections. There it has proven to be positive if the riveting devices each have a rivet section for each carrier shell and a web section, the web section being designed as a spacer between the carrier shells. In principle, so-called H-rivets are known and are pursued separately by the applicant.

However, the prior art has so far revealed a number of problems that need to be solved. The existing solutions are not yet optimal in terms of the rigidity of the entire planet carrier. Although staked sheet metal bridges help here, they do not yet allow for all the advantages of lightweight construction while maintaining a high level of rigidity. In particular, there are still disadvantages with a so-called “polygonal shape / n-gonal shape”, determined by the number of planets, which determines the number of bridges.

It is therefore the object of the present invention to mitigate and, at best, even completely eliminate the disadvantages known from the prior art.

This object is achieved according to the invention in a generic planetary carrier in that the bridge is shaped like a shell. This type of design allows planetary carriers to be achieved that have a good ratio between weight and rigidity. Welding processes can also be avoided during the connection. The two carrier parts, namely the carrier cheeks, can be fixed in their positions relative to one another through exclusive forming processes. Manufacturing can therefore become simpler, more efficient, faster and more cost-effective. In other words, a solution is presented in which sheet metal support parts and sheet metal bridges with defined areas are used to connect the two sheet metal parts to one another. The planet carrier according to the invention made of sheet metal with a plugged connection by sheet metal bridges can be used as part of a transmission component if a simple and rigid construction with sheet metal disk parts without welding processes is required for connecting the two carrier parts to one another. The invention presented here was made on the basis of the requirements of weight reduction with the aspect of increasing or maintaining the overall rigidity of the product and simplifying the production and assembly process, as well as reducing the cost of production tools and eliminating the welding process for connecting support parts piece developed.

Advantageous embodiments are claimed in the subclaims and are explained in more detail below.

It is therefore advantageous if the bridge forms a channel. A gutter is a narrow, elongated design, similar to a gutter or fairway. In the present case, the channel is a formed sheet metal part having a base from which rectangular walls protrude. The gutter is open on the side of the free ends of the walls. The floor itself follows a circle radius. Bent projections extend parallel to the floor from the free ends of the walls. The projections can also be referred to as rivets or rivet ends. Through appropriate bridge design You can rely on punching and forming processes that are predestined for large-scale production.

An advantageous embodiment is also characterized in that the bottom of the channel is located radially outside the projections. The result is a high level of rigidity for the entire planet carrier when fully assembled.

If there is a convex / spherical transition between two projections, notch stresses are avoided. A high fatigue strength is then the result.

It has proven useful if the transition is directed convexly towards the nearest support beam. The result is a precise placement of the individual parts. When riveting, i.e. reshaping the free ends of the projections, the carrier cheeks are also moved towards each other in a defined manner. The result is high precision.

It is also positive for stiffness if the bridge has more than two first projections and more than two second projections. The result is a particularly good cohesion of the girder cheeks relative to one another across the (variety of) bridge(s). Production is also simplified if each carrier cheek is designed as a flat/flat component. Ultimately, this makes it possible to use two types of identical parts. One identical part represents the two carrier cheeks and the other identical part provides the large number of bridges between the two carrier cheeks. The result is high cost efficiency and production speed.

It has also proven useful if the bridge has at least three projections on each side, but preferably fewer than seven.

The invention also relates to a planetary gear with a planet carrier according to the invention. It is particularly advantageous if 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12, i.e. n-planet bolts, are inserted into the two support cheeks and 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12, i.e. n bridges, i.e. the same number of bridges, are used. The result is a fairly symmetrical structure, which is advantageous for the introduction of force.

• 1 eine perspektivische Explosionsdarstellung eines erfindungsgemäßen Planetenträgers mit zwei Trägerwangen und drei Brücken vor dem Zusammenbau,
• 2 den Planetenträger aus 1 im Montageprozess bei noch unverformten Vorsprüngen der Brücke,
• 3 den Planetenträger der 1 und 2 in perspektivischer Darstellung im fertig montierten Zustand, also verformten nietartigen (Enden der) Vorsprünge der Brücken,
• 4 eine gestanzte Brücke im noch unverformten Zustand, also im flachen Zustand,
• 5 die zur Rinne verformte Brücke aus 4,
• 6 eine weitere perspektivische Darstellung der rinnenartig verformten Brücke aus 5 vor dem Zusammenbau und vor dem nietartigen Verformen der Vorsprünge,
• 7 einen der beiden Trägerwangen der Ausführungsform der 1 bis 3 in perspektivischer Darstellung,
• 8 eine Draufsicht auf die Trägerwange aus 7,
• 9 einen Querschnitt entlang der Linie IX durch die Trägerwange aus 8,
• 10 eine Vergrößerung des Bereichs X der 9,
• 11 eine Draufsicht auf eine Trägerwange mit eingesetzten Brücken, wobei die freien Enden der Vorsprünge der Brücken nietartig verformt sind,
• 12 einen Längsschnitt entlang der Linie XII aus 11 durch den dort dargestellten Planetenträger,
• 13 die Vergrößerung des Bereichs XIII aus 12 im fertigen Zustand,
• 14 der zeitlich vorgelagerte Zustand des Verformens der Vorsprünge mittels eines Werkzeugs,
• 15 ein Planetengetriebe mit einem erfindungsgemäßen Planetenträger in einer Draufsicht,
• 16 das teilweise im Längsschnitt dargestellte Planetengetriebe aus 15, wobei der Schnitt teilweise entlang der Linie XVI verläuft,
• 17 eine Vergrößerung des Bereichs XVII aus 16, und
• 18 eine perspektivische Darstellung des Planetengetriebes der 15.

The invention is explained in more detail below with the help of a drawing. Show it:

• 1 a perspective exploded view of a planet carrier according to the invention with two carrier cheeks and three bridges before assembly,
• 2 the planet carrier 1 in the assembly process when the bridge projections are still undeformed,
• 3 the planet carrier 1 and 2 in a perspective view in the fully assembled state, i.e. deformed rivet-like (ends of) the projections of the bridges,
• 4 a stamped bridge in an undeformed state, i.e. in a flat state,
• 5 the bridge deformed into a channel 4 ,
• 6 Another perspective view of the channel-like deformed bridge 5 before assembly and before the rivet-like deformation of the projections,
• 7 one of the two support cheeks of the embodiment 1 until 3 in perspective view,
• 8th a top view of the carrier beam 7 ,
• 9 a cross section along line IX through the carrier cheek 8th ,
• 10 an increase in the area X of the 9 ,
• 11 a top view of a carrier beam with inserted bridges, the free ends of the projections of the bridges being deformed like a rivet,
• 12 a longitudinal section along line XII 11 through the planet carrier shown there,
• 13 the enlargement of area XIII 12 in finished condition,
• 14 the previous state of deformation of the projections using a tool,
• 15 a planetary gear with a planet carrier according to the invention in a top view,
• 16 the planetary gear, partially shown in longitudinal section 15 , with the cut partly running along line XVI,
• 17 an enlargement of area XVII 16 , and
• 18 a perspective view of the planetary gear 15 .

The figures are only of a schematic nature and only serve to understand the invention. The same elements are given the same reference numbers.

In the 1 a planet carrier 1 according to the invention is shown. The planet carrier 2 has two carrier cheeks 2 and 3 made of sheet metal. As in the 15 , 16 and 18 can also be seen, the two carrier cheeks 2 and 3 are intended for supporting planetary gears 4 via planetary bolts 5.

Coming back up 1 it is clearly visible that three bridges 6 are used.

Each bridge 6 has a plurality of first projections 7 on one side and a plurality of second projections 8 on the other side. There are three first projections 7 and three second projections 8 for each of the three bridges 6. The first projections 7 should be inserted into receiving holes 9 in the first carrier cheek 2. The second projections 8 should be inserted into receiving holes 10 in the second carrier cheek 3.

Being plugged in is the 2 easy to see. In a subsequent step, the free ends of the projections 7 and 8 are shaped like a rivet, as in 3 can be recognized.

The projections 7 and 8 thus have defined areas 11.

In the 4 until 6 This design of the undeformed bridge 6 into a channel 12, having two walls 13 and a floor 14, is shown. There are crowns 15 in gaps 16 between projections 7 and projections 8.

In the 7 until 10 the design of the two support cheeks 2 and 3 is shown.

The fully assembled planet carrier 1 is also the 11 and 12 refer to. Each bridge 6 has a kind of U-shape in cross section. To reach the staked / rivet-like deformed areas 11 of the free ends of the projections 7 and 8, as in 14 indicated, a forming tool 16 is used. A forming force 17 is applied.

The assembly into a planetary gear 18 according to the invention with symmetrical carrier cheeks 2 and 3, planetary bolts 5 on which planet gears 4 are mounted, washers 19 and, for example, rolling bearings 20 designed as needle bearings is visualized. The planet carrier 1 can not only be used for a 3-planet design, it can also be used for rectangular, pentagonal, hexagonal or n-gonal designs. The number of planet gears is then equal to the number of sheet metal bridges 6.

The bridge 6 thus forms a web-like spacer with its base 14.

Reference symbol list

1

Planet carrier

2

first beam

3

second beam

4

Planetary gear

5

planetary bolt

6

Bridge

7

first lead

8th

second lead

9

Receiving hole in the first beam

10

Receiving hole of the second beam

11

demarcated area

12

gutter

13

Wall

14

Floor

15

Crowning/convexity

16

forming tool

17

Power

18

Planetary gear

19

washer

20

roller bearing

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely 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.

Cited patent literature

• DE 102018107359 A1 [0002]

Claims (10)

Planet carrier (1) with two carrier cheeks (2, 3) made of sheet metal for supporting planetary gears (4) via planetary bolts (5), with at least one bridge (6) made of sheet metal with at least one first projection (7) in a receiving hole ( 9) the one carrier cheek (2) and with at least one second projection (8) is inserted into a receiving hole (10) in the second carrier cheek (3) and the two projections (7, 8) are deformed like a rivet, the bridge (6) has a web-like spacer between the two projections (7, 8), which keeps the two support cheeks (2, 3) spaced apart, characterized in that the bridge is shaped like a shell. Planet carrier (1). Claim 1 , characterized in that the bridge (6) forms a channel (12). Planet carrier (1) according to one of the Claims 1 or 2 , characterized in that the channel (12) is located with its base (14) radially outside the projections (7, 8). Planet carrier (1) according to one of the Claims 1 until 3 , characterized in that a convex / spherical transition (15) is present between two projections (7, 8). Planet carrier (1). Claim 4 , characterized in that the transition is directed convexly towards the nearest carrier cheek (2 or 3). Planet carrier (1) according to one of the Claims 1 until 5 , characterized in that the bridge (6) has more than two first projections (7) and more than two second projections (8). Planet carrier (1) according to one of the Claims 1 until 6 , characterized in that each support cheek (2, 3) is designed as a flat/flat component. Planet carrier (1) according to one of the Claims 1 until 7 , characterized in that the bridge (6) has at least three projections (7, 8) on each side. Planetary gear (18) with a planet carrier (1) according to one of the preceding claims. Planetary gear (18) characterized in that n-planet bolts (5) are inserted into the two carrier cheeks (2, 3) and n-bridges (6) are inserted.

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