Spur gear housing for receiving a spur gear stage

Abstract

The invention relates to a spur gear housing (10) which is designed to receive a spur gear stage of a transmission. The spur gear housing (10) comprises: a reinforcement structure (12; 112) which is formed to absorb a force acting on the spur gear housing (10); a plurality of stop structures (14), each of which is designed for attaching at least one stop means for the spur gear housing (10); and a plurality of connection structures (16; 116), each of which is designed to provide at least one supply element of the spur gear stage. The reinforcement structure (12; 112) comprises radially outer receiving regions (12a) and radially inner reinforcement regions (12b) which are arranged in a distributed manner in the circumferential direction of the spur gear housing (10). The stop structures (14) and the connection structures (16; 116) are in each case distributed in the circumferential direction of the spur gear housing (10) and are provided in a number that is greater than the number required for use of the spur gear stage.

Description

[0001] Spur gear housing for accommodating a spur gear stage

[0002] Technical area

[0003] The present invention relates to a spur gear housing with multiple structures arranged circumferentially therein. The spur gear housing is designed to selectively accommodate and operate with various types of spur gear stages.

[0004] State of the art

[0005] Industrial gearboxes are well-known for driving industrial equipment. These industrial gearboxes consist of several housings containing various gear sections. The housings are manufactured individually according to customer requirements.

[0006] Description of the invention

[0007] In one aspect, the invention relates to a spur gear housing designed to accommodate a spur gear stage of a gearbox. The gearbox can be an industrial gearbox for transmitting torque from a motor to an industrial plant. An industrial plant can be understood, for example, as a rock mill for crushing rocks, a cement processing plant, or similar plants that are subject to high levels of shock. A spur gear stage can form the first gear stage in the torque transmission chain. The spur gear stage can be connected to the motor via a drive shaft. Alternatively or additionally, the spur gear stage can be connected to an industrial plant via an output shaft of the gearbox. A first gear ratio within the gearbox can be realized by means of the spur gear stage.To implement the first gear stages, the spur gear stage can comprise at least two gears that can be mechanically connected to transmit torque. The spur gear housing can be made of a metal material. The spur gear housing can have a cavity in which the spur gear stage can be accommodated. The spur gear housing can be constructed in two or more parts. The spur gear housing can be connected to additional gear housings.

[0008] The spur gear housing comprises a stiffening structure designed to absorb a force acting on the spur gear housing. A force acting on the spur gear housing can be understood to be a force caused by operation of the gearbox. For example, the rotating input shaft or the rotating output shaft of the gearbox can be mounted in the spur gear housing. As a result, the spur gear housing can be exposed to a shear force or a moment, for example. Alternatively or additionally, the spur gear housing can be exposed to vibrations during transport and during operation of the gearbox or the spur gear housing. These vibrations can also result in a force acting on the spur gear housing.Alternatively or additionally, the spur gear housing can be subjected to a tensile force or a compressive force, for example by connecting the spur gear housing to other gear housings.

[0009] A structure can refer to a portion of the spur gear housing that is shaped for a specific purpose. A structure can be divided into several substructures, which can be designed analogously to the structure. Alternatively, the substructures can be combined to form the structure.

[0010] A stiffening structure can be understood as a partial area of ​​the spur gear housing that does not deform, or only slightly deforms, under the influence of the force acting on the spur gear housing. The stiffening structure can be designed to direct the force acting on the spur gear housing in a predetermined direction, for example, along a longitudinal direction of the stiffening structure. Alternatively or additionally, the stiffening structure can be designed to absorb the force acting on the spur gear housing so that this force is not transmitted to other partial areas of the spur gear housing. The stiffening structure can, for example, have a higher area moment of inertia than adjacent partial areas of the spur gear housing.Alternatively or additionally, the stiffening structure may have a geometric structure, for example a plurality of ribs or a layered structure, which is suitable for dissipating the force acting on the spur gear housing.

[0011] The spur gear housing further comprises a plurality of stop structures, each of which is designed to attach at least one stop means for the spur gear housing. A stop means can be understood as a fastening means attachable to the spur gear housing, by means of which the spur gear housing can be fastened or held, for example during transport or during operation of the transmission. For example, a stop means can be an eyelet that can be screwed into the spur gear housing and to which a wire rope or chain can be attached. Round slings and chains are preferably used. Alternatively, a stop means can be understood as a connecting element, for example a rod element, by means of which the spur gear housing can be fastened to a fastening structure, for example a frame or a base.The lifting device can be detachably attached to the stop structure. For example, the lifting device can be attached to the stop structure for transporting the spur gear housing. The lifting device can be removed again before commissioning the gearbox.

[0012] The stop structures can have at least one surface to which the lifting device can be attached. For example, the surface can be provided with a hole into which the lifting device can be screwed. Other forms of attaching a lifting device are also conceivable, as long as the function is fulfilled. Alternatively or additionally, the stop structures can be shaped to counteract a force acting on the lifting device, for example, a tensile force acting on the lifting device.

[0013] The spur gear housing further comprises a plurality of connection structures, each of which is designed to provide at least one supply element of the spur gear stage. A supply element of the spur gear stage can be, for example, an oil level sensor that can detect an oil level within the spur gear housing. Alternatively or additionally, a supply element can be a temperature sensor that can detect a temperature within the spur gear housing. Further examples of a supply element of the spur gear stage can be a supply line for supplying the spur gear stage with electrical current or a supply line for supplying the spur gear stage with a lubricant.

[0014] The provision of at least one supply element can be achieved by pre-machining the connecting structures. For example, the connecting structures can be provided with bores, polished, ground, coated, or otherwise pre-machined in order to enable attachment of the supply element to the spur gear housing. Alternatively or additionally, the connecting structures can be provided with a connecting element, for example a flange, to which the supply element can be attached. Provision can be made for one connecting structure to be provided for multiple supply elements of the spur gear stage. Alternatively or additionally, provision can be made for one supply element to be provided on multiple connecting structures.

[0015] The stiffening structure can comprise radially outer receiving regions and radially inner stiffening regions. The receiving regions and the stiffening regions can be distributed in the circumferential direction of the spur gear housing. The radial direction of the spur gear housing can be defined starting from a longitudinal axis of the spur gear housing. The receiving regions can have at least one surface or area designed to absorb the force acting on the spur gear housing. The stiffening regions can be designed to dissipate the absorbed force. For example, the stiffening regions can have a greater material thickness than adjacent regions of the spur gear housing. Alternatively or additionally, the stiffening regions can have a geometric structure designed to dissipate the force, for example, a plurality of stiffening ribs or a plurality of stiffening layers.The circumferential direction of the spur gear housing can correspond to a direction along its outer circumference. The receiving regions and the stiffening regions can, for example, comprise a plurality of identical structural elements arranged circumferentially at predetermined distances or angles to one another. Alternatively or additionally, the receiving regions and the stiffening regions can each comprise a plurality of different structural elements arranged at predetermined distances or angles to one another. Thus, the stiffening structure is arranged along the entire circumference of the spur gear housing.

[0016] The stop structures and the connection structures are each distributed in the circumferential direction of the spur gear housing and are provided in a number that is greater than the number required for use of the spur gear stage. Use of the spur gear stage can be understood as the installation or assembly of the spur gear stage in the spur gear housing. Use of the spur gear stage can also be understood as the operation or use of the spur gear stage as part of a gearbox. For use of the spur gear stage, for example, only one, two, or three of the stop structures may be required. Alternatively or additionally, for use of the spur gear stage, for example, only one, two, or three of the connection structures may be required. Therefore, not all of the existing stop structures or connection structures are usually used.Rather, from the majority of stop structures or from the majority of connection structures, those can be selected which are necessary or advantageous for the selected application of the spur gear stage.

[0017] The proposed spur gear housing enables variable adaptation of the spur gear housing to different installation positions. The increased number of stop structures or connecting structures ensures that the respective structures are present multiple times in the circumferential direction of the spur gear housing. The spur gear housing can therefore be rotated into a preferred installation position or mounted in this position, in which, for example, the supply elements or the fastening devices can be attached to the spur gear housing in a particularly favorable manner. Due to the increased number of stop structures and connecting structures, their exact position does not have to be taken into account when installing the spur gear housing. Furthermore, the proposed spur gear housing enables variable adaptation of the spur gear housing to different arrangements of the spur gear stage accommodated in the spur gear housing.Due to the increased number of stop structures and connecting structures, different spur gear stages can be used in the spur gear housing without having to consider the exact position of the respective structures. Accordingly, the proposed spur gear housing can be used in a variety of different installation positions or with a variety of different spur gear stages. Finally, the stiffening structure is distributed along the entire circumference of the spur gear housing. Thus, its arrangement does not have to be taken into account when selecting the spur gear stage. Rather, the stiffening structure ensures increased rigidity of the spur gear housing for any application of the spur gear stage. The proposed spur gear housing is therefore suitable for a variety of different applications of the spur gear stage while simultaneously providing increased rigidity.

[0018] According to one embodiment, the receiving areas and stiffening areas are arranged alternately in the circumferential direction of the spur gear housing. The receiving areas and stiffening areas can be arranged alternately in the circumferential direction of the spur gear housing such that each stiffening area is followed by a receiving area in the circumferential direction, or each receiving area is followed by a stiffening area in the circumferential direction. The alternating arrangement of the stiffening areas and the receiving areas allows the absorbed force to be absorbed and dissipated along the entire circumference of the spur gear housing. This increases the rigidity of the spur gear housing.

[0019] According to a further embodiment, the stiffening structure runs in a wave-like manner in the circumferential direction of the spur gear housing. A wave-like course of the stiffening structure can be understood to mean a stiffening structure which has a substantially continuous outer contour which is designed in the form of repeating radially outer elevations and radially inner depressions. It can be provided that the peaks of the elevations or the troughs of the depressions are not tapered, but flattened. By means of the wave-like course, the wall thickness of the housing can be reduced or the rigidity with regard to bending loads can be increased. According to a further embodiment, the wave-like stiffening structure has a substantially constant wall thickness.A wall thickness can be understood as the distance between a radially outer side and a radially inner side of the circumferentially extending wave-shaped structure. This distance can be essentially constant along the entire circumference of the spur gear housing. This allows material to be saved without reducing the rigidity of the spur gear housing.

[0020] According to one embodiment, the stop structures can each have at least one radially outer stop region for attaching the at least one stop means and at least one radially inner stiffening region for dissipating a force acting on the stop structures. The radial direction of the spur gear housing can be defined starting from a longitudinal axis of the spur gear housing. The stop region can have at least one surface designed for attaching the stop means. The stiffening region can, for example, have a greater material thickness than adjacent regions of the spur gear housing. Alternatively or additionally, the stiffening region can have a geometric structure designed to dissipate the force, for example, a plurality of stiffening ribs or a plurality of stiffening layers.By locating the stop area radially outside the stiffening area, any force acting on the spur gear housing from the outside by the stop device can be easily absorbed and diverted to the stiffening area. This ensures sufficient load-bearing capacity for transport.

[0021] According to a further embodiment, the stop region is designed as a stop cam and the stiffening region is designed as a stiffening rib. A stop cam can be understood as a cylindrical or conical element which has a substantially flat upper side. The upper side of the stop cam can be designed for the attachment of the stop means. A stiffening rib can be understood as a stiffening region whose extent in the longitudinal direction can be considerably greater than in the transverse direction. Alternatively or additionally, it can be provided that the stiffening rib tapers radially inwards. Due to their respective design, a stop cam or a stiffening rib is particularly suitable for attaching the stop means or for dissipating the acting force.

[0022] According to a further embodiment, a plurality of stop cams are arranged at a predetermined distance from one another in the circumferential direction of the spur gear housing. The predetermined distance can be predetermined based on an angle. For example, the plurality of stop cams can each be arranged at an angle of 30°, 45°, 60°, 90°, or 120° relative to one another in the circumferential direction. Furthermore, the plurality of stop cams can be arranged at a combination of several angles relative to one another in the circumferential direction. For example, two of the stop cams can each be arranged at an angle of 60°, and two of the stop cams can each be arranged at an angle of 120° relative to one another in the circumferential direction. Other combinations of angular arrangements of the stop cams are also conceivable. Due to the predetermined distance, the arrangement of the stop cams can be adapted to a variety of uses of the spur gear housing.

[0023] According to a further embodiment, the connecting structures can be arranged at least partially offset radially inward with respect to the radially outer receiving areas of the stiffening structure. For example, the stiffening structure can be designed as a wave-shaped structure and have wave crests or wave troughs. One of the connecting structures can be arranged between two wave crests. Further configurations of the stiffening structure and the relative arrangement of the connecting structures thereto are also conceivable within the scope of the proposed spur gear housing. By designing the connecting structures radially offset inward with respect to the receiving areas, the installation space available in the spur gear housing can be optimally utilized.

[0024] According to a further embodiment, the connecting structures can be arranged at a substantially equal distance from one another in the circumferential direction of the spur gear housing. The distance can be specified based on a predetermined angle. For example, the connecting structures can each be arranged at an angle of 30°, 45°, 60°, 90°, or 120° relative to one another in the circumferential direction. Furthermore, the connecting structures can be arranged at a combination of several angles relative to one another in the circumferential direction. For example, two of the connecting structures can each be arranged at an angle of 45°, and two of the connecting structures can each be arranged at an angle of 90° relative to one another in the circumferential direction. Further combinations of angular arrangements are also conceivable. Due to the substantially equal distance, the arrangement of the connecting structures can be adapted to the selected application of the spur gear housing.

[0025] According to a further embodiment, the connection structures can have a substantially planar connection region for providing the at least one supply element. A substantially planar connection region can be understood as a region of the connection structures whose curvature lies below a predetermined threshold value. A substantially planar connection region can be machined particularly favorably for providing the supply element. The provision of the supply element by means of mechanical processing is thus facilitated by the substantially planar connection region.

[0026] A further embodiment of the spur gear housing can have at least one holding means connected to the spur gear housing for holding a lubricant line for the spur gear stage. The holding means can, for example, be designed in the form of a cylindrical opening into which the lubricant line can be inserted. Alternatively, the holding means can, for example, be designed as a groove in the casting of the spur gear housing, in which the lubricant line can be guided. A lubricant line can, for example, be understood as a pipe by means of which a lubricant, for example lubricating oil, can be supplied to the spur gear stage. By connecting the holding means to the spur gear housing, mechanical remachining of the spur gear housing during installation of the lubricant line is no longer necessary or only requires minimal effort.

[0027] According to a further embodiment, the spur gear housing comprises a housing pot and a housing cover mountable on the housing pot. The housing pot can be the portion of the spur gear housing that can be connected to another gear housing. The housing cover can be the portion of the spur gear housing that faces a motor connected to the spur gear stage. The housing pot and the housing cover mounted on it can form a cavity between them in which the spur gear stage can be accommodated. The two-part design of the spur gear housing facilitates the installation of the spur gear stage.

[0028] According to one embodiment, a further stiffening structure can be provided on the housing cover, which extends in a wave-like manner in the circumferential direction of the housing cover. The further stiffening structure can extend in a wave-like manner in the circumferential direction of the housing cover, analogous to the stiffening structure explained above. By forming a wave-like stiffening structure on both the housing pot and the housing cover, the rigidity of the two-part spur gear housing can be further increased.

[0029] According to a further embodiment, a plurality of additional connection structures can be provided on the housing cover. The additional connection structures can each be distributed in the circumferential direction of the spur gear housing. The distribution in the circumferential direction or the number of additional connection structures can be analogous to the distribution in the circumferential direction or the number of connection structures according to the embodiments explained above. By forming additional connection structures on the housing cover, the adaptability of the spur gear housing to various applications of the spur gear stage can be further increased.

[0030] According to a further embodiment, the spur gear housing can be designed to selectively accommodate and operate with different types of spur gear stages. The spur gear stages can, for example, differ in terms of a torque class. Alternatively or additionally, the spur gear stages can, for example, differ in terms of their geometric dimensions, their installation position, or their intended use. One of the different types of spur gear stages can be used in the spur gear housing. However, the inventive configuration of the spur gear stage makes it possible to use the spur gear housing with all of the different types of spur gear stages. According to a further embodiment, the spur gear housing can comprise, on the output side, a connecting section for connecting the spur gear housing to another gear housing and a receiving section for receiving the spur gear stage.A diameter of the connecting section can be smaller than a diameter of the receiving section. The connecting section and the receiving section can be designed as a single piece. Alternatively, the connecting section can be mountable on the receiving section. A diameter of the receiving section can be defined, for example, by a diameter of the spur gear stage received therein. A diameter of the connecting section can be defined, for example, by a diameter of the additional gear housing. Due to the smaller diameter of the connecting section, the spur gear housing can also be used with additional gear housings that have a smaller diameter than the spur gear housing. This improves the possible applications of the spur gear housing.

[0031] Short description of the drawings

[0032] Figure 1 shows schematically a spur gear housing with a housing pot and a housing cover according to an embodiment of the invention.

[0033] Figures 2a-2c schematically show different views of a housing pot of the spur gear housing according to an embodiment of the invention.

[0034] Figures 3a-3b schematically show different views of a housing cover of the spur gear housing according to an embodiment of the invention.

[0035] Figures 4a-4c show schematically different views of a

[0036] Stiffening structure and a stop structure of the spur gear housing according to an embodiment of the invention.

[0037] Detailed Description of Embodiments Figure 1 schematically shows a spur gear housing 10 according to one embodiment of the invention. The spur gear housing 10 comprises a housing pot 10a and a housing cover 10b. A cavity is formed between the housing pot 10a and the housing cover 10b, in which a spur gear stage (not shown) can be accommodated. The spur gear housing 10 is equipped with various structures to improve rigidity and adaptability to different installation positions of the spur gear stage, which will be discussed in more detail with reference to Figures 2-4.

[0038] Figures 2a to 2c schematically show various views of a housing pot 10a of the spur gear housing 10 from the exemplary embodiment of Figure 1. The housing pot 10a of the spur gear housing 10 comprises a stiffening structure 12 for absorbing a force acting on the spur gear housing 10. The stiffening structure 12 extends in a wave-like manner in the circumferential direction of the spur gear housing 10. The further design of the stiffening structure 12 is explained in more detail with reference to Figures 4a and 4b.

[0039] Figures 4a and 4b show detailed views of the stiffening structure 12 of the spur gear housing 10. As can be seen from the exemplary embodiment in Figure 4a, the stiffening structure 12 comprises a radially outer receiving region 12a for absorbing a force acting on the spur gear housing. In the exemplary embodiment in Figure 4a, the receiving region 12a is formed by a radially outer wave crest of the wave-shaped stiffening structure 12. As can be seen from the exemplary embodiment in Figure 4b, the stiffening structure 12 further has a radially inner stiffening region 12b. In the exemplary embodiment in Figure 4b, the stiffening region 12b is formed by a radially inner wave trough of the wave-shaped stiffening structure 12.

[0040] The housing pot 10a of the spur gear housing 10 further comprises a plurality of stop structures 14, each of which is designed for attaching at least one stop means for the spur gear housing 10. The stop structures 14 are shown in the illustration in Figures 2a and 2b in the form of stop cams. As can be seen, for example, from the illustration in Figure 2c, several stop cams 14 are arranged at a predetermined distance from one another in the circumferential direction of the housing pot 10a of the spur gear housing 10. In the exemplary embodiment in Figure 2c, two of the stop cams 14 are arranged at an angle of 60° relative to one another. Furthermore, two of the stop cams 14 are arranged at an angle of 120° relative to one another. The spur gear housing 10 can thus be rotated by 60° or 120°, respectively, in order to select a corresponding stop structure 14 for attaching at least one stop means for the spur gear housing 10.The further design of the stop structures 14 is explained in more detail with reference to Figure 4c.

[0041] Figure 4c shows a detailed view of the stop structures 14 of the spur gear housing 10. As can be seen from the exemplary embodiment of Figure 4c, the stop structures 14 comprise a radially outer stop region 14a for attaching at least one stop means and at least one radially inner stiffening region 14b for dissipating a force acting on the stop structures 14. In the exemplary embodiment of Figure 4c, the stop region 14a is designed as a stop cam, and the stiffening region 14b is designed as a stiffening rib.

[0042] Furthermore, the housing pot 10a of the spur gear housing 10 comprises a plurality of connection structures 16, each of which is designed to provide at least one supply element of the spur gear stage. The connection structures 16 have a substantially flat surface, as can be seen in the illustration in Figures 2a and 2c. The substantially flat surface can be machined with little effort to provide the supply element. As can be seen from the exemplary embodiment in Figure 2c, the connection structures 16 are each arranged at an angle of 90° relative to one another in the circumferential direction of the spur gear housing 10. The spur gear housing 10 can thus be rotated by 90° in each case in order to select a corresponding connection structure 16 for providing the supply element.

[0043] Referring to the embodiment of Figure 2c, a plurality of retaining means 18 are further connected to the spur gear housing 10. The retaining means 18 are designed to hold a lubricant line for the spur gear stage. In the embodiment of Figure 2c, the retaining means 18 are shown in the form of bores in a rib of the spur gear housing 10.

[0044] Figures 3a and 3b schematically show different views of a housing cover 10b of the spur gear housing 10 according to the exemplary embodiment of Figure 1. A further stiffening structure 112 is provided on the housing cover 10b, which extends in a wave-like manner in the circumferential direction of the housing cover 10b. The further stiffening structure 112 is designed analogously to the stiffening structure 12 according to the exemplary embodiment of Figures 2a to 2c.

[0045] Furthermore, the housing cover 10b comprises a plurality of additional connection structures 116. The additional connection structures 116 are each distributed in the circumferential direction of the housing cover 10b. The additional connection structures 116 are designed analogously to the connection structures 16 according to the exemplary embodiment of Figures 2a to 2c.

[0046] Reference symbol Spur gear housing a Housing pot b Housing cover ; 112 Reinforcing structure a Supporting area, wave crest b Reinforcing area, wave trough

[0047] Stop structures a Stop area, stop cam b Stiffening area, stiffening rib; 116 connecting structures

[0048] Holding devices

Claims

Patent claims 1 . Spur gear housing (10) which is designed to accommodate a spur gear stage of a transmission, the spur gear housing (10) comprising: - a stiffening structure (12; 112) which is designed to absorb a force acting on the spur gear housing (10); - a plurality of stop structures (14), each of which is designed to attach at least one stop means for the spur gear housing (10); and - a plurality of connecting structures (16; 116), each of which is designed to provide at least one supply element of the spur gear stage, wherein the stiffening structure (12; 112) comprises radially outer receiving regions (12a) and radially inner stiffening regions (12b) which are arranged distributed in the circumferential direction of the spur gear housing (10), wherein the stop structures (14) and the connecting structures (16; 116) are each distributed in the circumferential direction of the spur gear housing (10) and are provided in a number which is greater than the number required for the use of the spur gear stage.

2. Spur gear housing (10) according to claim 1, characterized in that the receiving regions (12a) and the stiffening regions (12b) are arranged alternately in the circumferential direction of the spur gear housing (10).

3. Spur gear housing (10) according to claim 1 or 2, characterized in that the stiffening structure (12; 112) extends in a wave-like manner in the circumferential direction of the spur gear housing (10).

4. Spur gear housing (10) according to claim 3, characterized in that the wave-shaped stiffening structure (12; 112) has a substantially constant wall thickness.

5. Spur gear housing (10) according to one of the preceding claims, characterized in that the stop structures (14) each have at least one radially outer stop region (14a) for attaching at least one stop means and comprise at least one radially inner stiffening region (14b) for dissipating a force acting on the stop structures (14).

6. Spur gear housing (10) according to claim 5, characterized in that the stop region (14a) is designed as a stop cam and the stiffening region (14b) is designed as a stiffening rib.

7. Spur gear housing (10) according to claim 6, characterized in that a plurality of stop cams are arranged at a predetermined distance from one another in the circumferential direction of the spur gear housing (10).

8. Spur gear housing (10) according to one of the preceding claims, characterized in that the connecting structures (16; 116) are arranged at least partially offset radially inwards with respect to the outer receiving areas (12a).

9. Spur gear housing (10) according to claim 8, characterized in that the connecting structures (16; 116) are arranged in the circumferential direction of the spur gear housing (10) at a substantially equal distance from one another.

10. Spur gear housing (10) according to one of claims 8 or 9, characterized in that the connection structures (16; 116) have a substantially planar connection region for providing the at least one supply element.

11. Spur gear housing (10) according to one of the preceding claims, further characterized by at least one holding means (18) connected to the spur gear housing (10) for holding a lubricant line for the spur gear stage.

12. Spur gear housing (10) according to one of the preceding claims, characterized in that the spur gear housing (10) comprises a housing pot (10a) and a housing cover (10b) mountable on the housing pot (10a).

13. Spur gear housing (10) according to claim 12, characterized in that a further stiffening structure (112) is provided on the housing cover (10b), which extends in a wave-like manner in the circumferential direction of the housing cover (10b).

14. Spur gear housing (10) according to claim 12 or 13, characterized in that a plurality of further connection structures (116) are provided on the housing cover (10b), wherein the further connection structures (116) are each distributed in the circumferential direction of the spur gear housing (10).

15. Spur gear housing (10) according to one of the preceding claims, characterized in that the spur gear housing (10) is designed to selectively accommodate and operate with different types of spur gear stages.

16. Spur gear housing (10) according to one of the preceding claims, characterized in that the spur gear housing (10) comprises, on the output side, a connecting portion for connecting the spur gear housing (10) to a further gear housing and a receiving portion for receiving the spur gear stage, wherein a diameter of the connecting portion is smaller than a diameter of the receiving portion.

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