DE102022102648A1 - Planet carrier with rigidity-optimized oil passage; and planetary gears - Google Patents

Abstract

The invention relates to a planetary carrier (1) for a planetary gear (10), with a base body (2), the base body (2) having two spaced-apart disc areas (3, 4) and a plurality of disc areas distributed along a circumferential direction, the two disc areas ( 3, 4) has mutually connecting web areas (5), wherein in the circumferential direction between the web areas (5) axially aligned receiving holes (7) are provided for receiving a bearing element for a planet wheel (11) in the disk areas (3, 4), and wherein each web area (5) has at least one oil guide duct (8) which is directly formed with the base body (2) by the primary form or is introduced completely by machining into the base body (2) and penetrates the base body (2) axially. The invention also relates to a planetary gear (10) with this planet carrier (1).

Description

The invention relates to a planet carrier for a planetary gear of a motor vehicle drive train.

The basic requirements for planetary carriers used in planetary gears, particularly in spur gear differentials, are to mount the planetary gears of several different planetary gear sets with as little wear as possible. It has been shown that twisting deformations of the planetary carrier in particular can lead to tilting of the contact surfaces for the planetary gears, as a result of which wear of the corresponding contact areas increases significantly. Consequently, the planetary carrier should be designed to be as robust as possible with respect to deformations, in particular torsional deformations. Lubrication precautions should also be taken.

It is therefore the object of the present invention to provide a planet carrier for a planetary gear which is designed to be as torsion-resistant as possible and at the same time designed for the effective distribution of lubricating oil.

According to the invention, this is achieved by the subject matter of claim 1 . Claim 1 claims a planetary carrier for a planetary gear, the planetary carrier being equipped with a base body. The base body has two disc areas arranged at a distance from one another and a plurality of web areas which are distributed along a circumferential direction and connect the two disc areas to one another. In the circumferential direction between the web areas, receiving holes aligned axially with one another are provided for receiving a bearing element for a planet wheel in the disk areas. Furthermore, each web area has at least one oil guide channel which is formed directly with the base body in the original form or is introduced completely into the base body by machining and which penetrates the base body axially.

Thus, a planetary carrier is produced directly with oil ducts using the original form. The notch effects caused in the planetary carrier by the provision of the oil ducts are accordingly significantly reduced, as a result of which the rigidity of the planetary carrier is as great as possible. The oil ducts also ensure efficient lubrication of the individual components of the planetary gear during operation.

Further advantageous embodiments are claimed with the dependent claims and explained in more detail below.

Accordingly, it is also advantageous if the oil duct is introduced by casting or sintering or in a 3D printing process.

If the oil duct is formed by machining, it is preferably drilled and/or milled.

It is also advantageous if each web area has two oil ducts that are offset in the circumferential direction. This further improves the oil distribution.

If the web area, more preferably the entire base body, is implemented in one piece (i.e. in one piece of material), the oil guide channels of the web areas are also designed to be particularly stable.

Furthermore, it is expedient if the at least one oil duct runs perpendicular to the pane areas. This results in simple manufacturability and a robust design of the planet carrier.

Furthermore, it is advantageous for simpler manufacture if the at least one oil-guiding channel has an inner lateral surface that runs conically at least in sections.

It is also advantageous if a first disk area is provided with projections on a side axially facing away from a second disk area, on which projections a side plate is attached/attached at a distance from the first disk area, with several in turn between the side plate and the first disk area in the circumferential direction distributed arranged (second) planet gears are recorded / stored.

Furthermore, the invention relates to a planetary gear for a motor vehicle, with a planetary carrier according to the invention according to at least one of the embodiments described above and a plurality of planetary gears rotatably mounted on the planetary carrier.

The planetary gear is particularly preferably designed as a spur gear differential or is provided with an integrated spur gear differential. Thus, the Ölleitkanal can be formed directly in the spur gear differential or it can be present in the planet carrier, but the planet carrier is constructed so that a spur gear differential is integrated on / in it.

If the oil duct is arranged coaxially to an axially extending feed hole of a bearing element of a planetary gear, the oil distribution is carried out particularly skilfully during operation.

In other words, according to the invention a rigidity-optimized planetary carrier with an oil passage (oil duct) is formed.

The invention will now be explained in more detail below with reference to figures, in which context various exemplary embodiments are also illustrated.

• 1 eine perspektivische Darstellung eines erfindungsgemäßen nach einem ersten Ausführungsbeispiel ausgebildeten Planetenträgers von seiner Vorderseite,
• 2 eine perspektivische Darstellung des Planetenträgers der 1 von seiner Rückseite,
• 3 eine perspektivische Darstellung des nun in Längsrichtung geschnittenen Planetenträgers der 1 und 2, wodurch ein zwischen Scheibenbereichen axial verlaufender Stegbereich versetzt zu einem Ölleitkanal gezeigt ist,
• 4 eine perspektivische Darstellung des in Längsrichtung geschnittenen Planetenträgers der 1 und 2 in einer gegenüber der in 3 gewählten Schnittebene versetzten Schnittebene, wobei ein Ölleitkanal im Schnitt näher zu erkennen ist,
• 5 eine perspektivische Darstellung eines erfindungsgemäßen Planetenträgers nach einem zweiten Ausführungsbeispiel von seiner Vorderseite,
• 6 eine perspektivische Darstellung des Planetenträgers der 5 von seiner Rückseite,
• 7 eine Längsschnittdarstellung des Planetenträgers der 1 und 2 im Bereich des Ölleitkanals, sowie
• 8 eine perspektivische Darstellung eines schematischen Teilzusammenbaus eines erfindungsgemäßen Planetengetriebes.

Show it:

• 1 a perspective view of a planet carrier according to the invention designed according to a first embodiment from its front,
• 2 a perspective view of the planet carrier 1 from his back,
• 3 a perspective view of the now cut in the longitudinal direction of the planet carrier 1 and 2 , whereby a land area running axially between disc areas is shown offset to an oil duct,
• 4 a perspective view of the planet carrier cut in the longitudinal direction 1 and 2 in one opposite the in 3 selected sectional plane offset sectional plane, whereby an oil duct can be seen more closely in the section,
• 5 a perspective view of a planet carrier according to a second embodiment of the invention from its front,
• 6 a perspective view of the planet carrier 5 from his back,
• 7 a longitudinal sectional view of the planet carrier 1 and 2 in the area of the oil duct, as well as
• 8th a perspective view of a schematic partial assembly of a planetary gear according to the invention.

The figures are only of a schematic nature and serve exclusively for understanding the invention. The same elements are provided with the same reference numbers.

With the 1 until 4 and 7 a planetary carrier 1 of a first exemplary embodiment is shown. The planet carrier 1 is used in a planetary gear 10 according to the invention. The planetary gear 10 is preferably also used in a drive train of a motor vehicle.

A designed as a spur gear planetary gear 10 is connected to 8th indicated schematically. In 8th In particular, a planetary assembly of the planetary gear 10 can be seen. Several first planetary gears 11 (of a first planetary gear set), several second planetary gears 12 (of a second planetary gear set) and several third planetary gears 13 (of a third planetary gear set) are already rotatably mounted on the planet carrier 1 . In the usual way, these planet gears 11, 12, 13 partially mesh with each other and/or with sun gears of the planetary gear 10, which are not shown here for the sake of clarity.

In 8th can also be seen that the planet carrier 1 is essentially realized in two parts. A base body 2, which is explained in more detail below, is made from a cast material and is therefore formed by casting in a primary shaping process. A side plate 14 is attached to the base body 2 . In this embodiment, the base body 2 and side plate 14 also form the planetary carrier 1 .

With regard to the body 2 is with the 1 and 2 It is easy to see for the first exemplary embodiment that it has two disk areas 3, 4 that run essentially parallel to one another. The disk areas 3 , 4 are spaced axially from one another as seen in relation to a central longitudinal axis/axis of rotation 16 . The two disk areas 3 , 4 are connected to one another via a plurality of web areas 5 , here three, distributed in the circumferential direction (direction along a circular line running coaxially to the axis of rotation 16 ). The web areas 5 are each of the same design and run perpendicularly to the planes of the disk areas 3, 4, ie axially.

In the circumferential direction between the web areas 5, receiving holes 7 in the form of through-holes are formed/introduced in the disc areas 3, 4 in alignment with one another (axially). The receiving holes 7 serve directly to receive a bearing pin 15 (bearing element) for mounting a first planet wheel 11 (in 8th indicated). Alternatively, the bearing pin 15 can also be designed as a one-piece axial extension of the first planet wheel 11 .

According to the invention, the web areas 5 are each provided with two oil guide channels 8 penetrating them axially in the original form, that is to say directly in the casting process of the base body 2 . The oil ducts 8 run in a straight line through the web areas 5 (axially) through/penetrate the base body 2 completely. The two oil ducts 8 of a web area 5 run parallel to one another. The respective Ölleitkanal 8 is used during operation to conduct / convey a lubricating oil, here preferably directly to the supply to the second planetary gears 12 and third planetary gears 13. It is particularly advantageous if the respective oil duct 8 is arranged coaxially to an axially extending feed hole of a bearing element (again designed as a bearing bolt or as an axial extension) of the second planet wheel 12 or the third planet wheel 13 .

It can also be seen that the disk areas 3 , 4 are recessed radially outside of the oil guide channels 8 / web areas 5 . In the circumferential direction at the height of the receiving holes 7, the disc areas 3, 4 thus protrude further outwards in the radial direction/the disc areas 3, 4 have a larger outer diameter than in the circumferential direction at the height of the respective web area 5.

It can also be seen that a first disk area 3 has three projections 6 distributed in the circumferential direction on a side facing away axially from the second disk area 4 . The projections 6 are used in accordance with the fully assembled state 8th for receiving/supporting the side plate 14. Furthermore, the second planet gears 12 and third planet gears 13 are then rotatably mounted on the side plate 14. Thus, the second planetary gears 12 and third planetary gears 13 are arranged axially between the first disk portion 3 and the side plate 14, while the first planetary gears 11 are arranged axially between the two disk portions 3,4.

Combined with 7 It can also be seen that each oil duct 8 is preferably formed with a conical inner lateral surface 9 . In a finished design, the oil duct 8 preferably consists of a first longitudinal section 17 with a constant diameter, which is incorporated in the first disk area 3, and a second longitudinal section 18, which directly adjoins the first longitudinal section 17 and extends continuously from the first longitudinal section 17 extends conically until it emerges on an axial side of the second disk region 4 facing away from the first disk region 3 .

In connection with the 5 and 6 a second exemplary embodiment is also illustrated, which, however, corresponds to the first exemplary embodiment in terms of structure and function. For the sake of brevity, only the differences from the first exemplary embodiment are briefly described.

It can be seen in the second exemplary embodiment that the disk areas 3, 4 each have a constant outside diameter. Consequently, the disk areas 3 , 4 are provided with the same outer diameter at the level of the web areas 5 as seen in the circumferential direction as at the level of the receiving holes 7 .

In other words, the planet carrier 1 according to the invention combines several advantages at the same time. The previously used oil pipes, which have to be manufactured and assembled as individual parts, are now cast in planet carrier 1. These do not have to be machined or precisely manufactured. Not just three, but six oil pipes (oil ducts 8) can also be manufactured at no cost. On average, the planet carrier 1 nevertheless represents a conventional design with a web (web area 5) which connects the two sides (disc areas 3, 4) of the planet carrier 1. The oil pipes may be designed so large that the planet wheels 11 and other components of the wheelset do not collide with them. By arranging the oil pipe web further to the center of the planet carrier 1, a significantly higher rigidity of the two side walls is achieved together. The material that is located radially above the oil pipes on the side walls no longer contributes to the load balance of the carrier and can simply be omitted from the casting process.

Reference List

1

planet carrier

2

body

3

first disk area

4

second disk area

5

bridge area

6

head Start

7

receiving hole

8th

oil duct

9

inner lateral surface

10

planetary gear

11

first planet wheel

12

second planet gear

13

third planet gear

14

side plate

15

bearing element

16

axis of rotation

17

first longitudinal section

18

second longitudinal section

Claims (9)

Planetary carrier (1) for a planetary gear (10), with a base body (2), wherein the base body (2) has two spaced-apart disc areas (3, 4) and several arranged distributed along a circumferential direction, which at web areas (5) connecting the disk areas (3, 4), with receiving holes (7) aligned axially with one another in the circumferential direction between the web areas (5) for receiving a bearing element for a planet wheel (11) in the disk areas (3, 4) are provided, and wherein each web area (5) has at least one oil guide channel (8) which is formed directly with the base body (2) in the primary form or is introduced completely by machining into the base body (2) and penetrates the base body (2) axially. Planet carrier (1) after claim 1 , characterized in that the oil duct (8) is introduced by casting or sintering or in a 3D printing process. Planet carrier (1) after claim 1 or 2 , characterized in that each web area (5) has two oil guide channels (8) which are offset in the circumferential direction. Planet carrier (1) according to one of Claims 1 until 3 , characterized in that the web area (5) is formed in one piece. Planet carrier (1) according to one of Claims 1 until 4 , characterized in that the at least one oil duct (8) runs perpendicularly to the disk areas (3, 4). Planet carrier (1) according to one of Claims 1 until 5 , characterized in that the at least one oil duct (8) has an inner lateral surface (9) which runs conically at least in sections. Planetary gear (10) for a motor vehicle, with a planet carrier (1) according to at least one of Claims 1 until 6 and a plurality of planet gears (11) rotatably mounted on the planet carrier (1). Planetary gear (10) after claim 7 , characterized in that the planetary gear (10) is designed as a spur gear differential or with an integrated spur gear differential. Planetary gear (10) after claim 7 or 8th , characterized in that the Ölleitkanal (8) is arranged coaxially to an axially extending feed hole of a bearing element of a planet wheel (12).

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