DE102010051863A1 - Planet pinion carrier of planetary gear for plant, has driven shaft that is provided with axial portion, and planar portion that is formed radially on flat surface of axial portion - Google Patents

Abstract

The carrier (1) has a driven shaft (2) that is provided with an axial portion (3). A planar portion is formed radially on a flat surface (4) of axial portion. Independent claims are included for the following: (1) planetary gear; and (2) plant.

Description

The invention relates to a planet carrier, a planetary gear and a system.

Planetary gear with a planet carrier on which a drive or output shaft is formed, are known. The function of the input or output shaft as driving or aborting shaft depends on the use of the planetary gear with the planet carrier. Functionally, planetary carriers are also referred to as lands.

To connect such a planetary gear, it is known to provide on the input or output shaft flanges, feather key systems, clamping and / or interference fits.

The invention has for its object to provide a planetary gear in which the load capacity is improved.

According to the invention the object is achieved in the planet carrier with the features specified in claim 1 and in the planetary gear with the features specified in claim 14.

Important features of the invention of a Planetenradträgers are that a drive or output shaft is provided, which has an axial portion on which at least one flat, radially oriented surface is formed. Here, by radial orientation is meant an orientation of the surface at which the surface normal of the flat surface encloses an acute angle with a radial direction or even coincides with a radial direction. The terms "radial", "axial" and "circumference" are used in relation to the axis of rotation dictated by the input or output shaft of the planet carrier. The surface formed according to the invention provides a simple, loadable point of application for a positive connection of the input or output shaft with a further rotary part. It can thus be transmitted large torques, whereby the load capacity of the planet carrier and a total of a planetary gear, in which the planet carrier according to the invention is installed, is improved.

In an advantageous embodiment, the axial section is conically shaped. In this case, the surface with an axial plane and / or with an axis of the input or output shaft includes a preferably acute angle. However, it is particularly favorable for the manufacture of the planet carrier if the surface is designed or arranged parallel to an axial plane and / or parallel to an axis of the input or output shaft.

In an advantageous embodiment, it is provided that the radially oriented surface is radially offset relative to an axis of the input or output shaft. The advantage here is that the surface is thus arranged off-center and thus provides a lever for transmitting large torques.

In an advantageous embodiment, it is provided that at least two planar, radially oriented surfaces are formed on the axial section. These surfaces can be offset from one another in the circumferential direction, ie at a distance from one another. Between the surfaces can be formed a transition region or transition, which can describe a cylinder segment. In an advantageous embodiment, in this case the surfaces are an angle with each other or aligned parallel to each other. In an advantageous embodiment, the surfaces are arranged on opposite sides.

In an advantageous embodiment it is provided that the surfaces are also formed adjacent to each other in the circumferential direction, wherein preferably transitions are formed between the adjacent surfaces, for example, to obtain a shape that is suitable for a cast production. To improve the torque transmission is provided in an advantageous embodiment, that the axial portion has two or more such planar, radially oriented surfaces which are spaced apart in the circumferential direction of the input or output shaft or adjacent to each other.

In an advantageous embodiment, it is provided that the axial section has a polygonal cross section. The advantage here is that the polygonal cross-sectional shape, which describes an enveloping mathematical polygon with rounded corners, favorable for the torque transmission with low notch effect in the corresponding receiving part.

In an advantageous embodiment, it is provided that the axial section is designed as a polygon whose side surfaces represent planar, radially oriented surfaces.

In an advantageous embodiment, it is provided that the polygon is shaped as triangular, square, pentagonal, hexagonal or with another, preferably regular cross-sectional shape. The training as a square has proven to be particularly favorable manufacturing technology, especially for the correspondingly shaped receiving the axial portion of the other connection or rotary part.

In an advantageous embodiment, it is provided for mounting the planet carrier that between a planetary gear receiving Planetenradaufnahme and the axial section, a cylindrical first shaft portion is formed. This shaft portion can carry the bearing, via which the planet carrier is mounted in a planetary gear.

In an advantageous embodiment, it is provided that the Planetenradaufnahme carries the planet gears axially on one side. For the transmission of high torques, it has proven to be beneficial to form the Planetenradaufnahme as a cage. Here, a cage is understood to mean a shape in which radially oriented recesses are formed, in which the planetary gears are arranged, wherein the bearing of the planetary gears are respectively axially supported on both sides of the planet gears on the cage.

In an advantageous embodiment, it is provided that a Planetenradaufnahme has two axially spaced cheeks, which are connected by axially extending connecting webs. Preferably, the cheeks are arranged coaxially with the input or output shaft and take the planet gears in the position of use between them. By the connecting webs, the space between the cheeks is divided in the circumferential direction, whereby recesses for receiving the planet gears are formed.

In an advantageous embodiment, to further improve the mounting of the planet carrier in a planetary gear provided that axially spaced from the first shaft portion, a cylindrical second shaft portion is formed. This second shaft section can be used, for example, for a second storage. The second shaft section may additionally or alternatively be used for sealing means, for example a shaft sealing ring.

In an advantageous embodiment, it is provided that the second shaft section is formed on the axial end of the planet carrier facing away from the axial section. As a result, the greatest possible distance between the axial section and the second shaft section is achieved. This is favorable for the introduction of force in the torque transmission from and to the planet carrier.

In an advantageous embodiment, it is provided that one or the Planetenradaufnahme is disposed between the first shaft portion and the second shaft portion. The advantage here is that the Planetenradaufnahme axially on both sides in a planetary gear is storable.

In an advantageous embodiment, it is provided that the first shaft portion has a greater axial length than the second shaft portion. It is advantageous in this case that the bearings provided on the shaft sections can be dimensioned differently. For example, the first shaft portion may be disposed between a Planetenradaufnahme and the axial portion. In this case, the main load of the bearing can be absorbed by the larger sized first shaft portion.

In an advantageous embodiment, it is provided that the axial section is formed on an axial end projecting from the or a planetary gear receptacle. Thus, the axial total length of the planet carrier can be optimally utilized.

In an advantageous embodiment, it is provided that fastening means are introduced on an end face of the input or output shaft. The advantage here is that the fastening means for axially securing a form-fitting connected to the input or output shaft rotary member can be used. In an advantageous embodiment, the fastening means comprise at least one axially aligned mounting hole. In an advantageous embodiment, a thread is formed in the mounting hole, in which engages a locking screw for the axial securing of the connecting or rotating part.

In an advantageous embodiment, it is provided that the mounting hole is arranged off-center with respect to an axis of the input or output shaft. Such a design has proven to be favorable for many applications.

In an advantageous embodiment, a plurality of mounting holes are formed on the end face, whereby the axial securing of the connecting or rotating part can be further improved. For example, it may be provided that the mounting holes are arranged in a symmetrical about the axis of the input or output shaft hole pattern. In this way it can be achieved that the connecting part or rotary part, which introduces or derives the torque, can be fastened in several orientations on the input or output shaft. Preferably, the rotational symmetry of the hole pattern agrees with the rotational symmetry of the polygon of the axial section.

In an advantageous embodiment, it is provided that in the end face a transport bore is formed centrally in relation to the axis. The advantage here is that for transporting the planet carrier in the transport hole a lifting eye or a transport hook can be screwed, with which the planet carrier can be lifted, transported and used for mounting in the planetary gear. Due to the central arrangement arise during transport no unwanted torques. The possibility of being able to transport the planet carrier by means of lifting eye or transport hook, is particularly advantageous if the planet carrier is designed for use in a planetary gear with a nominal torque of more than 5 kNm.

In an advantageous embodiment of the planet carrier is made as a casting. In particular, the Planetenradaufnahme can be formed as a cage in this way in a few manufacturing steps. Also, the material used can be exploited so with low losses. Preferably, in this case, the shaft sections are manufactured by turning.

In an advantageous embodiment, it is provided for a defined abutment of a connection or rotary part to be placed on the axial section that a shaft shoulder is formed between the first shaft section and the axial section. Preferably, the first shaft portion has a larger diameter than the maximum diameter of the axial portion.

To solve the problem is provided with a planetary gear, the planet carrier, also called web, inventively form.

In an advantageous embodiment, it is provided that a bearing of the planet carrier is arranged on the first shaft section and / or on the second shaft section.

In an advantageous embodiment, it is provided that a shaft sealing ring is arranged on the first shaft section. The advantage here is that the shaft seal closes the interior of the planetary gear to the outside tight, the input or output shaft protrudes through the shaft seal and the axial section is arranged outside of a planetary gear housing. Thus, the axial section provides an easily accessible point of application for torque transmission to a driving or abortive connection or rotary part. The connecting or rotating part can be axially secured on the input or output shaft, for example with screws or bolts, which engage in corresponding axially or radially aligned mounting holes on the input or output shaft.

To achieve the above object is in a system comprising a planetary gear and a device with at least one rotatably mounted connector part, provided that the planetary gear is designed according to the invention and that the connecting part with the planet carrier of the planetary gear rotatably connected detachably.

In an advantageous embodiment, it is provided that a receptacle is formed on the connecting part, in which the axial section is arranged in the position of use.

In an advantageous embodiment, it is provided that the receptacle is shrunk onto the axial section and / or that the receptacle and the axial section form an interference fit. The advantage here is that a backlash-free torque transmission is effected.

In an advantageous embodiment, it is provided that the receptacle has an inner contour which is matched to the outer contour of the axial section or this is similar. The advantage here is that the material is optimally exploitable.

In an advantageous embodiment, the connection part is a shaft. The advantage here is that a direct cultivation is feasible.

In an advantageous embodiment, the connecting part is a coupling, in particular a cable coupling. A cable coupling has the advantage that a return of the driven strand is not retransmitted.

In an advantageous embodiment, the planetary gear and the device each have a housing, wherein the housing directly, preferably in Flanschmontage, or indirectly, preferably via a common frame or a common base plate, are interconnected. Thus, a compact system with self-contained power flow can be formed.

The invention will now be described with reference to an embodiment, but is not limited to this embodiment. Further embodiments result from combining one or more features of the claims with each other and / or with one or more features of the embodiment.

LIST OF REFERENCE NUMBERS

1

planet

2

Input or output shaft

3

axial

4

area

5

axis

6

crossing

7

Planetenradaufnahme

8th

recess

9

cheek

10

connecting web

11

Cage

12

pin bore

13

first shaft section

14

axial

15

second shaft section

16

axial

17

face

18

fastener

19

mounting hole

20

conveying hole

21

axial length

22

shaft shoulder

23

cast slope

It shows

1 a planet carrier according to the invention in a three-dimensional oblique view and

2 according to the planet carrier 1 in a different spatial orientation in a three-dimensional oblique view.

A whole with 1 designated planet carrier has a drive or output shaft 2 for the rotationally fixed connection of the planet carrier 1 with another rotary part.

At the input or output shaft 2 is an axial section 3 formed, over which the positive, rotationally fixed connection is made with the rotary part not further apparent.

In the axial section 3 are four flat surfaces 4 educated. The surfaces 4 are each oriented radially.

On the surfaces 4 are correspondingly shaped mating surfaces of the rotating part flat. Because of the surfaces 4 in relation to the axis 5 the input or output shaft 2 and the planet carrier 1 are arranged eccentrically, thus can over the surfaces 4 a torque in the input or output shaft 2 be initiated or removed from this.

The four surfaces 4 form a square with square radial section. Thus, each circumferentially adjacent surfaces close 4 in pairs a right angle, while opposing surfaces 4 are aligned parallel to each other.

In the circumferential direction between the surfaces 4 are transitions 6 formed with a slope or with a radius. The square thus has a polygonal cross-section, in particular radial section.

At the planet carrier 1 is a planetary gear 7 educated.

The planet wheel shot 7 has recesses 8th on, in which the planetary gears not shown are used.

Axially on both sides of these planet wheels are cheeks at an axial distance to each other 9 formed, which by connecting webs 10 connected to each other.

The cheeks 9 thus form together with the axially extending connecting webs 10 a cage 11 in whose recesses 8th the planet gears mentioned are included.

Here, the planetary gears are mounted on not shown, known per se bolts, which in the bolt holes 12 the cheeks 9 are fixed.

In the illustrated embodiment, the Planetenradaufnahme 7 a total of four circumferentially offset from each other arranged recesses 8th to accommodate four planetary gears, which is to achieve a great smoothness and the transmission of high torque advantage.

In further embodiments, planetary gear can also 1 for receiving a different number of planetary gears in preferably regular arrangement, for example, of three planetary gears or of two planet gears, be formed.

For storage of the planet carrier 1 according to 1 and 2 in a planetary gear is a cylindrical shaft portion 13 at the input or output shaft 2 educated. On this first wave section 13 a bearing is arranged when the planet carrier 1 is installed in the planetary gear. The first wave section 13 is between the planetary gear pickup 7 and the axial section 3 arranged.

Between the first shaft section 13 and the axial section 3 is a wave shoulder 22 formed. This wave shoulder 22 forms a stop for the on the axial section 3 aufzusetzende connection or rotary part.

Axially spaced from the first shaft portion 13 is at the axial end 14 that of the axial section 3 is turned away, a second shaft section 15 educated.

The planet wheel shot 7 is thus between the first shaft section 13 and the second shaft portion 15 arranged.

The second wave section 15 serves as well as the first shaft section 13 for receiving a bearing of the planet carrier 1 ,

The first wave section 13 has opposite the second shaft section 15 a greater axial length 21 to additionally accommodate a shaft seal and / or to provide more axial space for a reinforced bearing.

Out 1 and 2 is still further evident that the axial section 3 directly or immediately at the axial end 16 of the planet carrier 1 or the input or output shaft 2 is formed, which of the Planetenradaufnahme 2 projects.

At the input or output shaft 2 is an end face 17 educated. In this face 17 are fasteners 18 in the form of axially aligned mounting holes 19 brought in.

The mounting holes 19 are off-center in relation to the axis 5 arranged and form one around the axis 5 Symmetrical hole pattern with twelve fixing holes in the example 19 ,

After the already mentioned several times connecting or rotating part for torque transmission to the axial section 3 is attached, the connecting or rotating part can be axially secured by passing through corresponding holes in the connecting or rotating part through bolts or bolts in the mounting holes 19 be screwed. Here, a locking washer can be placed axially on the connecting or rotating part, through which the screws or bolts are guided.

In the face 17 is centered in relation to the axis 5 a transport hole 20 brought in. The transport bore 20 is different from the mounting holes 19 in that it has a larger diameter. In the transport hole 20 a thread is also formed, in which a transport hook or a transport lug can be screwed. At this transport hook or at this transport eye of the planet carrier 1 transported hanging and even - preferably with pre-assembled planet gears - are used in a ring gear from above.

The planet carrier 1 is made in one piece as a casting, which is particularly true on the cast slopes 23 the connecting webs 10 is recognizable.

When installed in a planetary gear are thus in the recesses 8th the planet gears are arranged, and it's on the shaft sections 13 . 15 each bearing arranged, wherein on the first shaft portion 13 In addition, a shaft seal is arranged.

At the planet carrier 1 is proposed on the input or output shaft 2 an axial section 3 provide, which for torque transmission at least one radially oriented, flat surface 4 having.

Claims (15)

Planet carrier ( 1 ) with a drive or output shaft ( 2 ), characterized in that the input or output shaft ( 2 ) an axial section ( 3 ), on which at least one flat, radially oriented surface ( 4 ) is trained. Planetary gear carrier according to one of the preceding claims, characterized in that the surface ( 4 ) with respect to an axis ( 5 ) of the input or output shaft ( 2 ) is formed radially offset. Planetary gear according to one of the preceding claims, characterized in that on the axial section ( 3 ) at least two planar, radially oriented surfaces ( 4 ) offset in the circumferential direction to each other and / or adjacent to each other in the circumferential direction, preferably parallel to each other and / or enclosing an angle with each other. Planetary gear carrier according to one of the preceding claims, characterized in that the axial section ( 3 ) has a polygonal cross section and / or that it is designed as a polygon, in particular as a square. Planetary gear according to one of the preceding claims, characterized in that between a planetary gears receiving Planetenradaufnahme ( 7 ) and the axial section ( 3 ) a cylindrical first shaft portion ( 13 ) is trained. Planetary gear carrier according to one of the preceding claims, characterized in that a Planetenradaufnahme ( 7 ) two axially spaced cheeks ( 9 ), which by axially extending connecting webs ( 10 ) are connected. Planet carrier ( 1 ) according to one of the preceding claims, characterized that axially spaced from the first shaft portion ( 13 ) a cylindrical second shaft section ( 15 ) is trained. Planetary gear carrier according to one of the preceding claims, characterized in that the second shaft section ( 15 ) at the of the axial section ( 3 ) facing away from the axial end ( 14 ) is trained. Planetary gear carrier according to one of the preceding claims, characterized in that a Planetenradaufnahme ( 7 ) between the first shaft section ( 13 ) and the second shaft section ( 15 ) is arranged. Planet carrier ( 1 ) according to one of the preceding claims, characterized in that the first shaft section ( 13 ) has a greater axial length ( 21 ) has as the second wave section ( 15 ) and / or that the axial section ( 3 ) at one of a Planetenradaufnahme ( 7 ) projecting axial end ( 16 ) is trained. Planet carrier according to one of the preceding claims, characterized in that on an end face ( 17 ) of the input or output shaft ( 2 ) Fastening means ( 18 ), in particular at least one axially aligned mounting hole ( 19 ) are introduced and / or that the mounting hole ( 19 ) off-center with respect to an axis ( 5 ) of the input or output shaft ( 2 ) is arranged. Planetary gear carrier according to one of the preceding claims, characterized in that a plurality of fastening boreholes ( 19 ) in the face ( 17 ) are formed, in particular in one about the axis ( 5 ) of the input or output shaft ( 2 ) symmetrical hole pattern, and / or that in the end face ( 17 ) centered in relation to the axis ( 5 ) a transport hole ( 20 ) is trained. Planetary gear carrier according to one of the preceding claims, characterized in that the planet carrier ( 1 ) is manufactured as a casting and / or that between the first shaft portion ( 13 ) and the axial section ( 3 ) a wave shoulder ( 22 ) is trained. Planetary gear, characterized in that the planetary gear a planet carrier ( 1 ), which is formed according to one of the preceding claims, in particular wherein on the first shaft portion ( 13 ) and / or on the second shaft section ( 15 ) each have a bearing of the planet carrier ( 1 ) and / or wherein on the first shaft section ( 13 ) A shaft seal is arranged. Plant comprising a planetary gear and a device with at least one rotatably mounted connection part, characterized in that the planetary gear is formed according to the preceding claim and that the connection part with the planet carrier ( 1 ) of the planetary gear rotatably connected, in particular wherein on the connecting part a receptacle is formed, in which in the position of use of the axial section ( 3 ) is arranged.

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