DE102018114760A1 - Use for a planetary gear pin of a planetary gear - Google Patents

Abstract

The invention relates to an insert (1) for a planet gear pin (2) of a planetary gear (3), comprising at least one radial bore (4a-4h) and at least one channel (5a-5h) which is formed in the interior of the insert (1) and extends from a first distal end of the insert (1) to at least one radial bore (4a-4h) in order to deliver lubricating oil from an oil catcher (6) adjacent to the insert (1) to a bearing element (7) on the planet gear pin (2 ), the insert (1) being cup-shaped, an opening (8) being formed on the first distal end and a bottom (9) being formed on a second distal end, and the at least one channel (5a-5h) is groove-shaped in an inner peripheral surface of the insert (1).

Description

The invention relates to an insert for a planet gear pin of a planetary gear. The insert is intended to guide lubricating oil from an oil catcher to a bearing element on the planet gear pin.

Planetary gears generally have a plurality of planet gears, which are rotatably mounted on a planet carrier via planet gear bolts. The planet carrier is often non-rotatably connected to a ring gear, the planet gears meshing with a toothing of the ring gear. There is at least one sun gear in the center, which in turn meshes with the planet gears. Such planetary gears are used, for example, in automotive transmissions, for example as axle differentials or as distribution differentials.

The planet gears seated on the planet gear bolts are usually rotatably supported on the planet gear bolts via a bearing. In some gear designs, it has proven difficult to lubricate these bearings with an oil bath, so that oil supplies have become known which bring the oil from radially inside to the bearings through a cavity in the bolts.

The DE 10 2010 054 870 A1 discloses, for example, inserts for a planetary gear arrangement. The inserts are inserted in a cylindrical cavity of a planetary gear carrier and interact with an oil catcher in order to supply lubricating oil to the bearing.

The object of the present invention is to provide an improved use for a planet gear pin. The object is achieved by the subject matter of patent claim 1. Preferred embodiments can be found in the dependent claims.

An insert according to the invention for a planetary gear pin of a planetary gear comprises at least one radial bore and at least one channel which is formed in the interior of the insert and extends from a first distal end of the insert to at least one radial bore in order to remove lubricating oil from an adjoining insert Lead oil catcher to a bearing element on the planet gear pin, the insert being cup-shaped, an opening being formed at the first distal end and a base being formed at a second distal end, and the at least one channel being groove-shaped in an inner peripheral surface of the insert.

The cup-shaped design of the insert has manufacturing advantages and, for example, facilitates the assembly of the insert on the planet gear pin. The insert is axially inserted into the hollow planet gear pin with the second distal end, with the first distal end facing the oil pan. In particular, the oil catcher comes into contact at least partially with the insert, the insert being fixed axially between the oil catcher and the planet gear pin.

The at least one channel is preferably designed in an arc shape from the first distal end to the at least one radial bore. In other words, the respective channel is not straight, but describes a curve, in particular a helix or screw curve. The arcuate design of the respective channel enables improved lubricating oil guidance from the opening at the first distal end to the respective radial bore. In other words, the lubricating oil is introduced into the insert via the opening at the first distal end and at least partially guided through the channels to the radial bores. When the planet carrier rotates, the lubricating oil in use is accelerated in the axial and radial directions regardless of the direction of rotation of the planet carrier and is guided through the radial bores in the direction of the planet gear bearing on the planet carrier.

The invention includes the technical teaching that the insert is manufactured as a plastic casting component. In particular, the insert is a plastic injection molded component. The insert is preferably used in a planetary gear that does not have an oil pump, in particular in planetary gears for electrical drive devices.

Preferably, two channels adjoining each other in the circumferential direction together form essentially a parabolic shape. Furthermore, the two channels which jointly form a parabola are preferably separated from one another at the apex, each of the two channels opening into a respective radial bore in an apex region. A parabolic shape is the geometric shape of a quadratic function.

The invention includes the technical teaching that at least one radially configured collar element for positioning the insert on the planet gear pin is formed on the first distal end. Two collar elements are preferably formed on the insert, each collar element penetrating a recess provided on the planet gear pin in order to align the insert axially and in the circumferential direction in such a way that the radial bores interact fluidly with radial bores in the planet gear pin in use.

• 1 eine schematische Perspektivschnittdarstellung zur Veranschaulichung des Einführens eines erfindungsgemäßen Einsatzes in einen Planetenradbolzen eines Planetengetriebes,
• 2 eine schematische Schnittdarstellung zur Veranschaulichung des im Planetenradbolzen montierten Einsatzes gemäß 1,
• 3 eine schematische Schnittdarstellung des im Planetenradbolzen montierten Einsatzes gemäß den 1 und 2,
• 4 eine schematische Stirnseitendarstellung auf ein erstes Ende des Einsatzes gemäß den 1 bis 3,
• 5 eine schematische Stirnseitendarstellung auf ein zweites Ende des Einsatzes gemäß den 1 bis 4,
• 6 eine schematische Schnittdarstellung des Einsatzes gemäß den 1 bis 5, und
• 7 eine schematische Perspektivdarstellung des Einsatzes gemäß den 1 bis 6.

Further measures improving the invention are shown below together with the description of a preferred embodiment of the invention with reference to the figures. It shows

• 1 2 shows a schematic perspective sectional view to illustrate the insertion of an insert according to the invention into a planet gear pin of a planetary gear,
• 2 is a schematic sectional view illustrating the insert mounted in the planet gear pin according to 1 .
• 3 is a schematic sectional view of the insert mounted in the planet gear pin according to the 1 and 2 .
• 4 is a schematic front view of a first end of the insert according to the 1 to 3 .
• 5 is a schematic front view of a second end of the insert according to the 1 to 4 .
• 6 is a schematic sectional view of the insert according to the 1 to 5 , and
• 7 is a schematic perspective view of the use according to the 1 to 6 ,

1 shows an insert according to the invention 1 when inserted into a planetary gear pin 2 of a planetary gear 3 , which is only partially shown in the present case. The planetary gear 3 has multiple planet gears 11 on, in the present case only a section of the planetary gear 3 with a single planet gear 11 is shown. The planet gear 11 is over the planet gear pin 2 rotatable on a planet carrier 12 of the planetary gear 3 arranged, being between the planet gear 11 and the planet gear pin 2 a bearing element 7 is arranged. The bearing element 7 is designed as a needle bearing. On both ends of the planet gear 11 is a respective disc 13 arranged. The planet gear pin 2 has a total of four radial bores 14a-14d on that in the assembled state of use 1 with radial holes 4a-4h of use 1 are fluidically connected. Furthermore, the use 1 eight channels 5a-5h on that inside of the insert 1 are formed and extend from a first distal end of the insert 1 down to the respective radial bore 4a-4h extend. The stake 1 is cup-shaped, with an opening at the first distal end 8th and a bottom at a second distal end 9 is trained. The canals 5a-5h are groove-shaped in an inner peripheral surface of the insert 1 educated. Not all radial bores are present due to the sectional view 4a-4h , Channels 5a-5h , and radial bores 14a-14d shown.

2 shows the stake 1 in the assembled state within the planet gear pin 2 , The stake 1 has two radially formed collar elements at the first distal end 10a . 10b for positioning the insert 1 in the planet gear pin 2 on. The two collar elements 10a . 10b come in provided axial recesses 15a . 15b on one end of the planet gear pin 2 to the facility. Furthermore comes to use 1 and on the planet carrier 12 an oil pan 6 axial to the system. The oil pan 6 is for collecting lubricating oil, especially immersion, spray and splash oil in the operation of the planetary gear 3 and introducing the collected lubricating oil into the insert 1 intended. The lubricating oil flows through the respective arcuate channel 5a-5h in action 1 from the first distal end to the respective radial bore 4a-4h to get through this from use 1 into the respective radial bore 14a - 14d on the planet gear pin 2 to get. About the radial holes 14a-14d on the planet gear pin 2 becomes the bearing element 7 supplied with lubricating oil.

In 3 is the one in the planetary bolt 2 ordered insert 1 to 2 shown in section, whereby 3 a sectional view of the insert 1 according to a cutting line AA shows, and being the cutting line AA in 2 is drawn. In contrast shows 2 a sectional view of the insert 1 according to a cutting line BB , in the 3 is drawn. How particularly good looking 3 is a respective channel 5a-5h with a respective radial bore 4a-4h in use 1 fluidly connected, the radial bores 4a . 4h with the radial bore 14a on the planet gear pin 2 are fluidically connected, the radial bores also 4b . 4c with the radial bore 14b on the planet gear pin 2 are fluidically connected, the radial bores also 4d . 4e with the radial bore 14c on the planet gear pin 2 are fluidly connected, and wherein the radial bores 4f . 4g with the radial bore 14d on the planet gear pin 2 are fluidically connected.

4 shows a first end view of the insert 1 , the arrangement of the channels 5a-5h that extend from the first distal end of the insert 1 extend, as well as the arrangement of the two collar elements 10a . 10b that are opposite each other at the first distal end of the insert 1 trained, clearly emerges. There is also an opening at the first distal end 8th educated.

In contrast, according to 5 who have a second end view of the insert 1 shows a bottom at a second distal end 9 educated. So the stake is 1 closed at the second distal end and thus fluid-tight. That about the opening 8th Introduced lubricating oil can only over the radial holes 4a - 4h out of action 1 escape.

6 is a sectional view of the insert 1 according to a cutting line CC , in the 4 is drawn. Out 6 the arcuate course of the groove-shaped channels goes particularly well 5a-5h in the inner peripheral surface of the insert 1 in the present case, due to the sectional view only the channels 5a-5d are shown. channel 5a is with the radial bore 4a connected, channel 5b is with the radial bore 4b connected, channel 5c is with the radial bore 4c connected and channel 5d is with the radial bore 4d connected. Two channels adjoining each other in the circumferential direction 5a-5h are essentially parabolic. In the present case, the channels form 5b and 5c essentially a parabolic shape, with the respective radial bores in the vertex region of the parabola 4b . 4c are arranged.

In 7 is the stake 1 shown in perspective. Out 7 the pot-shaped design of the insert is particularly clear 1 out. There are next to the opening 8th the channels at the first distal end 5a-5h as well as the radial bores 4d-4g shown.

LIST OF REFERENCE NUMBERS

1

commitment

2

pinion pin

3

planetary gear

4a-4h

radial bore

5a-5h

channel

6

Oil tray

7

bearing element

8th

opening

9

ground

10a, 10b

collar element

11

planet

12

planet carrier

13

disc

14a-14d

radial bore

15a, 15b

recess

A-A

intersection

B-B

intersection

C-C

intersection

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

• DE 102010054870 A1 [0004]

Claims (4)

Insert (1) for a planet gear pin (2) of a planetary gear (3), comprising at least one radial bore (4a-4h) and at least one channel (5a-5h), which is formed in the interior of the insert (1) and differs from one extends the first distal end of the insert (1) to at least one radial bore (4a-4h) in order to guide lubricating oil from an oil catcher (6) adjacent to the insert (1) to a bearing element (7) on the planet gear pin (2), characterized in that the insert (1) is pot-shaped, an opening (8) being formed on the first distal end and a base (9) being formed on a second distal end, and the at least one channel (5a-5h) being groove-shaped is formed in an inner peripheral surface of the insert (1). Insert (1) after Claim 1 , characterized in that the at least one channel (5a-5h) is arcuate from the first distal end to the at least one radial bore (4a-4h). Insert (1) according to one of the preceding claims, characterized in that in each case two channels (5a-5h) adjoining one another in the circumferential direction together form essentially a parabolic shape. Insert (1) according to one of the preceding claims, characterized in that at least one radially formed collar element (10a, 10b) for positioning the insert (1) in the planet gear pin (2) is formed on the first distal end.

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