D-shaped housing cover

Abstract

The invention relates to a D-shaped housing cover, in particular to a transmission (101) having at least one planetary stage (103) and at least one spur gear stage (105), wherein a shaft (109) of the planetary stage (103) and a first shaft (111) of the spur gear stage (105) are connected to one another in a rotationally fixed manner, and wherein a housing (121a, 121b) of the spur gear stage (105) forms at least one bearing seat for a second shaft (117) of the spur gear stage. The transmission has a housing cover (119), by means of which the housing (121a, 121b) of the planetary stage (103) and the housing (121a, 121b) of the spur gear stage (105) are fixed to one another, wherein the housing cover (119) encloses the bearing seat in a fluid-tight manner.

Description

Technical Field

[0001] The invention relates to a transmission and a method for producing a transmission component. Background Art

[0002] Wind power transmissions usually have a spur gear stage on the output side, followed by a planetary stage. The following focuses on the housing connection between these two transmission stages. The housing of the spur gear stage is fixed to the housing of the planetary stage via a housing connection. The housing connection must be adapted to the actual geometric structure of the spur gear stage and the planetary stage. This makes it difficult to reuse components across transmissions (getriebeübergreifend). Therefore, for example, changing the axial position of the output shaft requires a specially adjusted housing connection. Summary of the invention

[0003] The object of the present invention is to provide a transmission which does not have the disadvantages inherent in the solutions known from the prior art. In particular, the degree of reusability of components across transmissions should be increased.

[0004] This object is achieved by the transmission according to the invention and the method according to the invention for producing a transmission assembly.

[0005] The transmission comprises at least one planetary stage and at least one spur gear stage. The planetary stage is a transmission stage, that is to say a region of the transmission which in turn forms a transmission with a ring gear, a planetary gear carrier, one or more planetary gears and a sun gear. The planetary gears are rotatably supported in the planetary gear carrier and mesh with the ring gear and / or the sun gear respectively. Two of the three parts, namely the ring gear, the planetary gear carrier and the sun gear, are rotatably supported, and the third part is arranged in a rotationally fixed manner. Thus, for example, the ring gear can be integrated into the transmission housing in a rotationally fixed manner, while the planetary gear carrier and the sun gear are rotatably supported. One of the two rotatably supported parts is connected in a rotationally fixed manner to an input end, for example an input shaft of the planetary stage, and the other rotatably supported part is connected to an output end, for example an output shaft. The input and output of the planetary stage are arranged coaxially with each other, that is, have a common axis of rotation.

[0006] A spur gear stage is a transmission stage with gears which are all designed as spur gears and are rotatably mounted. In particular, all gears of the spur gear stage can be externally toothed. The axes of rotation of the gears are each held fixed in position and extend parallel to one another. The output shaft of the spur gear stage is usually arranged offset from the input shaft axis.

[0007] The shaft of the planetary stage and the first shaft of the spur gear stage are connected to one another in a rotationally fixed manner. The shaft of the planetary stage is preferably the output shaft of the planetary stage. Accordingly, the first shaft of the spur gear stage is preferably the input shaft of the spur gear stage. A rotationally fixed connection means a connection in which the connecting parts cannot be twisted relative to one another. In particular, the shaft of the planetary stage and the first shaft of the spur gear stage can be connected to one another in one piece.

[0008] The housing of the spur gear stage forms a first bearing seat for a second shaft of the spur gear stage. The second shaft is different from the first shaft. The two shafts are particularly axially offset relative to one another.

[0009] The bearing seat is a device for accommodating and fixing the bearing. At present, the following bearing is accommodated and fixed, so that the second shaft is supported in the housing in a rotatable manner by the bearing. The first bearing seat is preferably implemented as a through hole, that is, as a cylindrical through-hole with two through openings. This bearing seat is used to accommodate and fix the outer ring of the bearing, so that the second shaft is supported in the housing by the bearing.

[0010] According to the invention, the transmission has a housing cap as a housing connection between the planetary stage and the spur gear stage. The housing of the planetary stage and the housing of the spur gear stage are fixed to each other by means of the housing cap. The housing cap is thus a connecting element between the housing of the planetary stage and the housing of the spur gear stage. In particular, the housing cap can have the basic shape of a hollow body with a first opening and a second opening. The housing of the planetary stage is fixed to the first opening. Correspondingly, the housing of the spur gear stage is fixed to the second opening.

[0011] The housing shell preferably has the original shape of a hollow body of revolution. The original shape of the body is referred to as the shape of the initial body, from which the first-mentioned body is generated by eliminating individual regions, for example by incorporating recesses, and / or by adding individual regions.

[0012] The first bearing seat is encapsulated in a fluid-tight manner by the housing cover. That is, the housing cover covers the first bearing seat in such a way that fluid, in particular oil contained in the transmission, cannot escape into the surrounding environment. This means that the first bearing seat opens into the housing cover.

[0013] With the invention, a separate covering of the first bearing seat is obsolete. Such a covering requires adjustments to the housing cover, which is disadvantageous for the desired reusability.

[0014] In a preferred development, there is a fluid-tight connection between the housing cover and the housing of the spur gear stage on the one hand and between the housing cover and the housing of the planetary stage on the other hand. Preferably, the housing of the planetary stage, the housing cover and the housing of the spur gear stage form a common hollow space in which the transmission oil is present and which is enclosed in a fluid-tight manner towards the surroundings by the housing of the planetary stage, the housing cover and the housing of the spur gear stage.

[0015] In a further preferred refinement, the second shaft of the spur gear stage is an input or output shaft. This means that the second shaft end opposite the first shaft end protrudes from the housing of the spur gear stage. The second shaft end is located on the side of the housing opposite the first bearing seat. Conversely, the housing cover is arranged on the side of the housing opposite the second shaft end.

[0016] In a particularly preferred development, the housing of the spur gear stage is designed in two parts. In this case, a first dividing seam, which is preferably designed in a fluid-tight manner, extends between a first housing part of the housing of the spur gear stage and a second housing part of the housing of the spur gear stage. The first shaft is rotatably supported in the first housing part. Therefore, only the first housing part is used to support the first shaft. This means that the bearing that supports the first shaft in a rotatable manner is only fixed in the first housing part. The first bearing seat is formed by the first housing part and the second housing part. Therefore, the first housing part forms a first part of the first bearing seat and the second housing part forms a second part of the first bearing seat. The first dividing seam also extends through the bearing seat.

[0017] The above-described embodiments with respect to the first bearing seat and the two-part embodiment of the housing of the spur gear stage preferably apply analogously to the second bearing seat of the second shaft of the spur gear stage. The second bearing seat is therefore used to accommodate and fix a further bearing, with which the second shaft is rotatably supported in the housing of the spur gear stage. The first housing part of the housing of the second spur gear stage forms the first part of the second bearing seat. The second part of the second bearing seat is formed by the second housing part of the housing of the spur gear stage. The first separating seam also extends through the second bearing seat.

[0018] The first housing part of the housing of the spur gear stage forms the body and the second housing part forms a removable cover. Since the body and the cover together form a bearing seat for the second shaft, the second shaft can be oriented for maintenance purposes when the cover is removed. This enables maintenance or replacement of the second shaft during installation of the transmission in the tower of the wind power plant.

[0019] Preferably, the transmission is developed in such a way that the dividing joint and the axis of rotation of the second shaft lie in a common plane. The plane contains the dividing joint and the axis of rotation.

[0020] In a preferred development, a second separating seam extends between the housing of the spur gear stage and the housing cover. The second separating seam extends here not only on the first housing part of the housing of the spur gear stage, but also on the second part of the housing of the spur gear stage. This means that a first part of the second separating seam extends between the first housing part and the housing cover; a second part of the second separating seam extends between the second housing part and the housing cover. The first housing part and the housing cover form the first part of the separating seam, the second housing part and the housing cover form the second part of the separating seam. Preferably, the second separating seam is also designed to be fluid-tight.

[0021] The second separating joint is preferably designed to be flat, ie, extends in one plane or is contained in one plane.

[0022] In a preferred improvement, a portion of the surface of the housing cover is annular and forms a bulge radially outward. This portion of the surface of the housing cover and the housing of the spur gear stage form a second dividing seam. The bulge covers at least a portion of the bearing seat.

[0023] Preferably, the bulge is modified in a D-shape. This means that the bulge has an arcuate shape. In particular, the bulge can be designed in a semicircular shape.

[0024] Since the bulge at least partially covers the bearing seat, the positioning of the bulge also changes with the position of the bearing seat. In order to increase the degree of reusability of the individual parts across the transmission, the housing cover is designed in at least two parts in a preferred development, if the positioning of the second shaft is variable depending on the respective application. The first part of the housing cover has a rounded surface section, while the second part has the bulge. With this development, the transmission series described below can be produced.

[0025] A transmission series is defined as a plurality of individual transmissions. These transmissions form a series, that is to say the series is generally identical.

[0026] The transmission system comprises a first transmission and a second transmission, each of which has a housing cover that is implemented in two parts. The second part of the housing cover of the first transmission and the second part of the housing cover of the second transmission are of the same structure. This makes it possible to use the second part across the transmissions in the transmission system.

[0027] The first parts of the housing cover of the first transmission and the first parts of the housing cover of the second transmission respectively have a receiving portion for fixing the second part. The receiving portion for fixing the second part of the housing cover of the first transmission and the receiving portion for fixing the second part of the housing cover of the second transmission are different in positioning. In addition, the first part of the housing cover of the first transmission and the first part of the housing cover of the second transmission are preferably of the same structure.

[0028] Different positioning of the receiving portion for fixing the second part of the housing cover makes it possible to achieve matching with different positioning of the second shaft. Due to the different positioning of the receiving portion, the use of the first part of the housing cover across the transmission is not possible. However, the method according to the invention makes it possible to use the following blank across the transmission, from which the first part of the housing cover is produced. The method provides that the first part of the housing cover of the first transmission is produced from a first blank and the first part of the housing cover of the second transmission is produced from a second blank. The first blank and the second blank are structurally identical. Within the scope of the first part of the respective housing cover made from the blank, the receiving portion for fixing the second part is produced. Here, the positioning of the receiving portion can be adjusted uniquely according to the transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Preferred embodiments of the present invention are shown in the accompanying drawings. Identical reference numerals represent identical or functionally identical features. In detail:

[0030] Figure 1 The transmission is shown;

[0031] Figure 2 The housing of the spur gear stage of the transmission is shown;

[0032] Figure 3 An integral flange of the housing cover is shown;

[0033] Figure 4 A two-piece flange is shown; and

[0034] Figure 5a and 5b A variant made from a blank is shown. DETAILED DESCRIPTION

[0035] Figure 1 The transmission 101 is shown in longitudinal section. The transmission 101 has a planetary stage 103 and a spur gear stage 105. Figure 1 As shown, one or more further planetary stages may be arranged upstream of planetary stage 103 .

[0036] The sun gear 107 of the planetary stage 103 is connected to the sun shaft 109 in a rotationally fixed manner, which serves as the output shaft of the planetary stage 103 and is connected to the hollow shaft 111 of the spur gear stage 105 in a rotationally fixed manner via a spline. The first spur gear 113 is arranged on the hollow shaft 111 and is connected to it in a rotationally fixed manner. The first spur gear meshes with the second spur gear 115. The second spur gear 115 is arranged on the output shaft 117 of the transmission and is connected to it in a rotationally fixed manner.

[0037] In order to connect the planetary stage 103 and the spur gear stage 105 to each other fixedly relative to the housing, a housing cover 119 is provided. The housing cover is integrated in one piece into the rotor-side part of the housing of the planetary stage 103 or of the transmission 101. The housing cover 119 is designed as a flange, to which the housing 121a, 121b of the spur gear stage 105 is screwed. The housing of the spur gear stage is formed by a body 121a and a cover 121b. The cover 121b is screwed onto the body 121a.

[0038] exist Figure 2 1 shows a view of the housing 121a, 121b from the direction of the rotor toward the generator, that is, in Figure 1 1. A view from right to left in the plane of the drawing. It can be seen here that the body 121a and the cover 121b together form a bearing seat for the rotor-side bearing of the output shaft 117. The body 121a and the cover 121b are joined to each other along a flat dividing surface.

[0039] The flange of the housing cover is Figure 3 In the figure, it is indicated by reference numeral 301. A top view of the flange 301 is shown in the axial direction from the generator to the rotor, i.e. Figure 1 The flange 301 has a circular ring-shaped portion 303 and a half-moon-shaped or D-shaped portion 305.

[0040] The annular portion 303 is aligned coaxially with the axis of rotation of the sunshaft 109. The axis of symmetry of the annular portion 303 is therefore identical with the axis of rotation.

[0041] The D-shaped portion 305 is designed as a bulge radially outward and covers the rotor side of the output shaft 117 in a fluid-tight manner, i.e., at Figure 11. The bearing seat is arranged on the left in the plane of the drawing. For this purpose, there is a fluid-tight connection between the D-shaped part 305 and the cover 121b of the housing 121a, 121b of the spur gear stage 105. In addition, there is a fluid-tight connection between the annular part 303 of the flange 301 and the body 121a of the housing 121a, 121b of the transmission stage 105. The fluid-tight connection surface between the flange 301 and the housing 121a, 121b extends completely around the axis of rotation of the sun shaft 109 and is closed per se.

[0042] Figure 4 The flange 301 of the two-part housing cover 119 is shown. The first part of the housing cover 119 forms the annular portion 303 and the second part forms the D-shaped portion 305. A flat dividing surface extends between the two parts, which is oriented parallel to the rotation axis of the sun shaft 109.

[0043] The angular position of the first part of the housing flange 119 is preset by the interface to the planetary stage 103 and is therefore immutable. Nevertheless, the solution of reusing the first component 303 across the transmission is Figure 5a and 5b Shown in. Figure 5a The first part of the housing flange 119 is shown with the annular portion 303 of the flange 301, wherein a dividing surface extends horizontally between the first portion and the second portion. This corresponds to Figure 4 The flange 301 shown. To produce such a part, the direction of the interface is machined from a rotationally symmetrical blank. Therefore, the direction of the interface is variable. It is therefore possible to change the angular position of the interface, such as Figure 5b As shown, the positioning of the second part of the housing shell 119 and thus the positioning of the D-shaped part 305 of the flange 301 can also be changed and matched to the changed positioning of the output shaft 117 .

[0044] Reference numerals list

[0045] 101 Transmission

[0046] 103 Planetary

[0047] 105 cylindrical gear stage

[0048] 107 Sun gear

[0049] 109 Sun Axis

[0050] 111 Hollow shaft

[0051] 113 First cylindrical gear

[0052] 115 Second cylindrical gear

[0053] 117 Output shaft

[0054] 119 Shell cover

[0055] 121a body

[0056] 121b Cover

[0057] 301 Flange

[0058] 303 Ring-shaped part

[0059] 305 D-shaped part

Claims

1. A transmission (101) comprising at least one planetary stage (103) and at least one spur gear stage (105), wherein: The shaft (109) of the planetary stage (103) and the first shaft (111) of the spur gear stage (105) are connected to one another in a rotationally fixed manner, and wherein: The housing (121a, 121b) of the spur gear stage (105) forms at least one bearing seat for a second shaft (117) of the spur gear stage, characterized in that A housing cap (119) is provided, by means of which the housing of the planetary stage (103) and the housing (121a, 121b) of the spur gear stage (105) are fixed to one another, wherein: The housing cover (119) encapsulates the bearing seat in a fluid-tight manner. The housing (121a, 121b) of the cylindrical gear stage (105) has a first dividing seam, which extends between a first housing part (121a) and a second housing part (121b), wherein: The first shaft (111) is rotatably supported in the first housing part (121a), wherein: The first housing part (121a) forms a first part of a bearing seat for the second shaft (117), and wherein The second housing portion (121b) forms a second portion of the bearing seat, And wherein there is a second dividing seam, wherein, A first portion of the second dividing seam extends between the first housing portion (121a) and the housing cover (119), wherein: A second portion of the second dividing seam extends between the second housing part (121b) and the housing cover (119).

2. The transmission device (101) according to claim 1, characterized in that: The housing shell (119) is connected in a fluid-tight manner to the housing (121a, 121b) of the spur gear stage (105) and to the housing of the planetary stage (103).

3. The transmission device (101) according to claim 1, characterized in that: The second shaft (117) is an input shaft or an output shaft.

4. The transmission device (101) according to claim 1, characterized in that: The first dividing seam and the rotation axis of the second shaft (117) are located in a common plane.

5. The transmission device (101) according to claim 1, characterized in that The second dividing joint has a flat course.

6. The transmission device (101) according to claim 5, characterized in that: The housing cover (119) forms a surface having a circular ring-shaped portion (303) and a raised portion (305) radially outwardly along the second dividing seam, wherein the raised portion (305) at least covers a portion of the bearing seat.

7. The transmission device (101) according to claim 6, characterized in that: The protrusion (305) has an arcuate shape.

8. The transmission device (101) according to any one of claims 6 to 7, characterized in that: The housing shell (119) is designed in at least two parts, wherein: The first component has the annular portion (303), and the second component has the raised portion (305).

9. A transmission assembly, comprising a transmission according to claim 8 as a first transmission and a transmission according to claim 8 as a second transmission, characterized in that: The second part of the housing cover of the first transmission device and the second part of the housing cover of the second transmission device are of the same structure, wherein: The first part of the housing shell of the first gear mechanism and the first part of the housing shell of the second gear mechanism each have a receptacle for fixing the second part, which receptacles differ in their angular position.

10. Method for producing a transmission assembly according to claim 9, characterized in that The first part of the housing shell of the first transmission is produced from a first blank, and the first part of the housing shell of the second transmission is produced from a second blank, wherein: The first blank and the second blank are structurally identical.

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