DE102017221353A1 - Spread planetary plain bearings - Google Patents

Abstract

The invention relates to an arrangement (101) having at least one planet pin (109), at least one planet wheel (105) and at least one radial plain bearing (115, 117); wherein the planetary gear (105) by means of the radial sliding bearing (115, 117) is rotatably mounted on the planet shaft (109). At least a part of the radial sliding bearing (115, 117) and a toothing of the planetary gear (105) are arranged on different sides of a radially oriented plane.

Description

The invention relates to an arrangement according to the preamble of claim 1.

Sliding planetary gears can be deformed due to deformations caused by misalignment. This problem is favored by narrow planet gears and correspondingly narrow plain bearings. In particular, the downstream planetary stages of multistage planetary gears of wind turbines are affected.

The invention has for its object to eliminate the inherent disadvantages of the prior art solutions disadvantages. In particular, the misalignments described above should be reduced.

This object is achieved by an arrangement according to claim 1. Preferred developments are contained in the subclaims.

The arrangement comprises at least one planet pin, at least one planetary gear and at least one radial sliding bearing. The planetary pin, the planetary gear and the radial plain bearing are part of a planetary stage. This also includes a planet carrier, a sun gear and a ring gear. The planet gear is rotatably supported by means of the radial sliding bearing on the planet shaft and meshes with the sun gear and / or with the ring gear. Two of the three components sun gear, planet carrier and ring gear are rotatably mounted. The third component is arranged rotationally fixed. The planetary pin is immovably fixed relative to the planet carrier in the planet carrier.

A radial plain bearing is defined as a plain bearing that rotatably supports one component - here: the planetary gear - and against radial displacements, i. fixed against displacements orthogonal to a rotation axis of the component. In the axial direction, i. E. along the axis of rotation allows the radial slide bearings shifts. The radial slide bearing has cylindrical sliding surfaces. The sliding surfaces thus have the shape of an outer or inner circumferential surface of a straight circular cylinder.

According to the invention, at least a part of the radial plain bearing and a toothing of the planetary gear, with which the planetary gear meshes with the sun gear and / or the ring gear, on different sides of a radial, i. arranged to a rotational axis of the planet orthogonally oriented plane. The plane thus extends between the part of the sliding bearing and the toothing of the planetary gear. No part of the toothing is on the same side of the plane as the part of the radial plain bearing.

The part of the radial plain bearing is preferably a part of its sliding surface pair. The part thus comprises a part of a first sliding surface and a part of a second sliding surface of the radial sliding bearing.

The invention enables a relative to the teeth of the planetary gear radially outwardly offset position of the sliding bearing. This reduces the stresses occurring in the slide bearing caused by orthogonal to the axis of rotation of the planet gear induced loads. Concomitant inclinations of the planetary gear are thus reduced.

The planetary gear can be rotatably mounted on the planet pin by means of a single radial plain bearing or by means of a first and a second radial plain bearing. The first radial sliding bearing and the second radial sliding bearing are arranged as described above. At least a part of the first radial plain bearing and a toothing of the planetary gear are thus located on different sides of a first, radially aligned plane. At least a part of the second radial plain bearing and the toothing are located on different sides of a second, radially aligned plane. The said part of the second radial plain bearing and the toothing in turn are on the same side of the first plane. Accordingly, said part of the first radial sliding bearing and the toothing are on the same side of the second plane. This implies that the gearing is located between the first level and the second level.

In a preferred embodiment, there is at least one recess or omission or depression in a cheek of the planet carrier. At least part of the radial plain bearing protrudes further education in the recess or is located within the recess. This implies that an area bordered by an opening of the recess separates the said part of the radial plain bearing from the rest of the radial plain bearing. The part of the radial plain bearing may be, for example, a part of a sliding surface pair of the radial plain bearing.

A cheek of a planetary carrier is a Leitstützstruktur in which the planet pins are fixed. It is usually a radially extending part of the planet carrier. A planet carrier has two cheeks, which are arranged opposite to each other. Each planetary pin is fixed with both ends in each of the cheeks. The term lead support structure is roughly defined in "Pahl / Beitz Design Theory" ( J. Feldhusen, K.-H. Grote, Springer Vieweg, 8th Edition, 2013 ).

The cheek forms in a further preferred development of at least one bolt seat. Under a bolt seat is a means for fixing a planetary bolt to understand. Preferably, it is a recess of the shape of a straight circular cylinder, in which the planetary pin can be inserted. To fix the planetary bolt, the bolt is stretched into the recess and / or the cheek shrunk into the bolt seat on the planet shaft.

The bolt seat is further education arranged in the recess. This means that the bolt seat opens into the recess. To insert the planet pin in the pin seat, an axial end of the pin seat must be passed through the recess.

The bolt seat and the recess are not identical. Thus, the recess has an area that does not belong to the bolt seat. In this area, the above-mentioned part of the radial sliding bearing is preferably arranged.

The arrangement is preferably further developed with at least one axial sliding bearing, which supports the planetary gear axially against the planet carrier, in particular against the cheek. The Axialgleitlager is arranged in the recess. Preferably, the Axialgleitlager is completely in the recess. For the arrangement of the thrust bearing, the above-mentioned, different from the bolt seat area is.

• 1 eine Planetenstufe mit gespreizten Planetenlager;
• 2 eine Planetenstufe mit Modular aufgebautem, gespreizten Planetenlager; und
• 3 eine weitere Planetenstufe mit gespreizten Planetenlagern.

Preferred embodiments of the invention are shown in the figures. Matching reference numbers identify identical or functionally identical characteristics. In detail shows:

• 1 a planetary stage with spread planetary bearings;
• 2 a planetary stage with a modular, spread planet bearing; and
• 3 another planetary stage with spread planetary bearings.

In the 1 illustrated planetary stage 101 includes a ring gear 103 , a planetary gear 105 , a planet carrier 107 , a planetary bolt 109 and a sun wheel 111 , The planet wheel 105 meshes with the ring gear 103 and with the sun wheel 111 ,

The planet carrier 107 and the sun wheel 111 are rotatably mounted. The ring gear 103 is rotatably in a gear housing 113 fixed.

The planet carrier 107 forms a first bearing seat 113 and a second bearing seat 115 out. In the two bearing seats 113 . 115 is the planetary bolt 109 fixed positively and non-positively.

The planet wheel 105 is rotatable on the planet pin 109 stored. Serve for this purpose a first radial sliding bearing 115 , a second radial plain bearing 117 , a first axial sliding bearing 119 and a second thrust bearing 121 ,

As an intermediate piece between the plain bearings 115 . 117 . 119 . 121 is a hollow shaft 123 intended. This surrounds the planet pin 119 and is by means of plain bearings 115 . 117 . 119 . 121 rotatable in the planetary pin 119 stored. The planet wheel 105 in turn is on the hollow shaft 123 fixed. Thus, the hollow shaft carries 123 the planetary gear 105 ,

The planet carrier 107 has a first recess 125 and a second recess 127 on, in which the hollow shaft 123 protrudes. The first radial plain bearing 115 and the first thrust bearing 119 are in the first recess 125 arranged. The second radial plain bearing 117 and the second thrust bearing 121 are corresponding in the second recess 127 arranged. In this way, the axial base of the bearing of the planetary gear increases 105 and the hollow shaft 123 , Tilts of the planetary gear 105 orthogonal to its axis of rotation, the bearing can accordingly provide greater resistance.

The first axial sliding bearing 119 is supported according to 1 against a cheek of the planet carrier 113 off, the second thrust bearing 121 against a heel of a planetary bolt 109 , An alternative is in 2 shown. Here is the planet pin 109 two-piece, consisting of a first piece 201 and a second piece 203 executed. The first piece 201 protrudes in the radial direction over the second piece 203 and thus forms a shoulder on which the first thrust bearing 119 supported. The second axial plain bearing 121 is based on a paragraph which is analogous to 1 through the second piece 203 is formed.

The planetary pin 109 , the first radial plain bearing 115 , the second radial plain bearing 117 , the first axial sliding bearing 119 , the second axial sliding bearing 121 and the hollow shaft 123 form according to 2 a module that is outside the planetary stage 101 pre-assembled and assembled in the planet carrier 107 can be used. This will be the first piece 201 in a representation of 2 right cheek of the planet carrier 107 fixed.

According to 3 is the planetary gear 105 widened axially outward to its axis of rotation. The hollow shaft 123 is due to the axial broadening of the planetary gear 105 replaced. This provides for a further stiffening of the planetary gear 105 ,

LIST OF REFERENCE NUMBERS

101

planetary stage

103

ring gear

105

planet

107

planet carrier

109

planet shaft

111

sun

113

gearbox

115

first radial plain bearing

117

second radial plain bearing

119

first axial sliding bearing

121

second axial sliding bearing

123

hollow shaft

125

first recess

127

second recess

201

first piece of the planetary bolt

203

second piece of planetary bolt

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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 non-patent literature

• J. Feldhusen, K.-H. Grote, Springer Vieweg, 8th Edition, 2013 [0012]

Claims (4)

Arrangement (101) with at least one planetary pin (109), at least one planetary gear (105) and at least one radial sliding bearing (115, 117); wherein the planetary gear (105) is rotatably supported on the planetary pin (109) by means of the radial sliding bearing (115, 117); characterized in that at least a part of the radial sliding bearing (115, 117) and a toothing of the planetary gear (105) are arranged on different sides of a radially oriented plane. Arrangement (101) according to Claim 1 ; characterized by a planet carrier (107); wherein at least one cheek of the planet carrier (107) has at least one recess (125, 127); wherein at least a part of the radial sliding bearing (115, 117) projects into the recess (125, 127). Arrangement (101) according to the preceding claim; characterized in that the cheek forms at least one bolt seat; wherein the bolt seat is disposed in the recess (125, 127). Arrangement (101) according to Claim 2 or Claim 3 ; characterized by at least one Axialgleitlager (119, 121), which supports the planet gear (105) axially against the planet carrier (107) and in the recess (125, 127) is arranged.

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