Drive having an annular gear and a pinion

Abstract

Disclosed is a drive having an annular gear and a pinion, wherein in particular the external teeth of the pinion mesh with the external teeth of the annular gear, wherein a casing at least partly filled with oil surrounds the external teeth of the annular gear and is sealed with respect to the annular gear.

Description

[0001] Drive, comprising a toothed ring and a pinion

[0002] Description:

[0003] The invention relates to a drive comprising a toothed ring and a pinion.

[0004] It is generally known that a gear ring can be driven by a pinion.

[0005] From US 3 186255 A, a segmented gear is known as the closest prior art.

[0006] A segmented gear is also known from CN 204 300 313 U.

[0007] A gear ring drive for rotating drums is known from DE 855 797 B.

[0008] The invention is therefore based on the object of providing a housing for a toothed ring in such a way that no oil from the interior area surrounded by the housing escapes into the environment.

[0009] According to the invention, the object is achieved by the drive according to the features specified in claim 1.

[0010] Important features of the invention in the drive are that the drive has a toothed ring and a pinion, in particular wherein the external toothing of the pinion engages with the external toothing of the toothed ring, wherein a housing at least partially filled with oil surrounds the external toothing of the toothed ring and is sealed off from the toothed ring. The advantage here is that the housing prevents oil from escaping into the environment. The toothed ring can be provided on a drum, wherein the housing surrounds the external toothing of the toothed ring in an oil-tight manner, but nevertheless occupies the smallest possible volume. For this purpose, the housing is sealed off from the toothed ring, in particular radially inside the external toothing.

[0011] In this way, a drum can be arranged radially inside the toothed ring, whereby the housing does not protect the drum, but the toothed ring, in particular the external toothing of the toothed ring.

[0012] For example, the drum is a drum of a cement mill.

[0013] The housing can be arranged stationary, in particular held on stilts.

[0014] In an advantageous embodiment, the gear ring is composed of ring segments arranged one behind the other in the circumferential direction (relative to the direction of rotation of the gear ring), in particular each connected to the other. This is advantageous because the ring segments can be manufactured on a machine whose dimensions are smaller than the outer diameter of the gear ring. The machine can be designed as a gear cutting machine and is used for grinding or milling the external gearing.

[0015] In an advantageous embodiment, each ring segment has external teeth and a support region, wherein the external teeth - relative to the direction of rotation of the gear ring - are arranged radially outside the support region, in particular adjacent to the support region. It is advantageous in this case that the support region has a flat surface section on each of its end faces, which adjoins the corresponding surface section of the next adjacent support region in the circumferential direction, in particular continuously and / or directly. The housing can thus be provided sealed to these flat surface regions arranged one behind the other in the circumferential direction. Alternatively, a first part of a sheet metal structure can also be connected to the support region, wherein the first part is then provided sealed to a second part by means of a seal, in particular an annular seal, wherein the second part is connected to the housing in a rotationally fixed manner.In an advantageous embodiment, the radial distance area covered by the housing overlaps with the radial distance area covered by the gear ring and, at least in part, also encompasses larger radial distances than the gear ring. Advantageously, the housing encompasses the gear ring at its radial outer edge. For this purpose, the housing extends radially outward further than the gear ring.

[0016] In an advantageous embodiment, the housing is composed of housing segments arranged one behind the other in the circumferential direction—relative to the direction of rotation of the gear ring—and in particular interconnected, in particular wherein the adjacent housing segments in the circumferential direction are connected to one another in an oil-tight manner, in particular by means of a flat seal arranged between them. This is advantageous in that the housing segments can be easily manufactured, in particular on a machine tool that is smaller than the outer diameter of the gear ring.

[0017] In an advantageous embodiment, a sheet metal structure is provided on each of the two end faces of the gear ring, forming an annular main channel and an annular first side channel, in particular, with the rotational axis of the gear ring being aligned coaxially with the annular axis of the main channel and / or the annular axis of the first side channel. The advantage here is that the channels of the sheet metal structure keep oil away from the seal, thus exposing the seal to only a minimal amount of oil.

[0018] In an advantageous embodiment, a separating plate is arranged in the first side channel, which has a smaller radial extent than the first side channel, wherein the radial spacing area covered by the first side channel comprises the radial spacing area covered by the separating plate, in particular wherein the first side channel has greater radial spacing than the first side channel. It is advantageous that the separating plate allows the first side channel to be divided into two subchannels, so that even less oil reaches the seal. However, the oil flows downward from the two subchannels to the main channel and is then transferred from there into the oil sump.

[0019] In an advantageous embodiment, a first part of the sheet metal structure is connected in a rotationally fixed manner to the gear ring and / or to the support area and the second, in particular the remaining, part of the sheet metal structure is firmly connected to the housing. The advantage here is that the channels can be realized using a sheet metal structure and are therefore cost-effective and easy to manufacture. The first part of the sheet metal structure is preferably connected to the support area in an oil-tight manner. This means that the oil flowing laterally out of the external teeth of the gear ring flows into the first part of the sheet metal structure and not into the environment. The main channel and the first side channel are formed in the first part of the sheet metal structure so that the oil is then collected in the channels.

[0020] In an advantageous embodiment, the housing surrounds the external toothing of the gear ring and is sealed off from the supporting region of the gear ring or from the first part of the sheet metal structure, in particular by interposing an annular seal whose ring axis is aligned coaxially with the rotational axis of the gear ring. The advantage here is that the housing surrounds the external toothing, yet the gear ring can be mounted on a drum arranged outside the housing, in particular radially spaced from the housing and radially inside the housing. Thus, while the external toothing is located in the oil, another component, such as the drum, can still be arranged radially inside the housing.

[0021] In an advantageous embodiment, the main channel has continuous recesses on its radial outer circumference, in particular on its radial outside, which recesses are in particular permeable to oil. The advantage here is that in the upper region of the gear ring, the oil escaping laterally from the external toothing of the gear ring can enter directly into the main channel and in the lower region of the gear ring the oil can escape into the oil sump of the housing. In an advantageous embodiment, the main channel and the first side channel are each impermeable to oil on their respective radial inner circumference, in particular on their respective radial inside. The advantage here is that the oil that has entered the respective channel is collected and does not drain radially inwards.

[0022] In an advantageous embodiment, a side wall of the main channel also functions as a side wall of the first side channel and has a recess permeable to oil. This is advantageous because the oil can flow from the first side channel into the main channel. For this purpose, the radial outer surface of the first side channel preferably has a smaller outer diameter than the radial outer surface of the main channel.

[0023] In an advantageous embodiment, the annular seal is arranged axially adjacent to the first side channel, in particular adjacent to it. This is advantageous because, due to the main channel, only small amounts of oil enter the first side channel, which is then drained away, so that the seal is exposed to very small amounts of oil. As a result, the seal is not exposed to high oil pressure and achieves a long service life.

[0024] In an advantageous embodiment, the annular cross-section of the seal is conical, abutting a conical region of the respective housing segment, or triangular, with the longest side of the triangle touching the first part of the sheet metal structure, in particular, and thus sealing against this first part of the sheet metal structure. This is advantageous in that the seal abuts the first part at a shallow angle, thus minimizing wear.

[0025] In an advantageous embodiment, the radially outer periphery, in particular the radial outside, of the main channel is connected to the second part of the sheet metal structure, while the radially inner periphery, in particular the radial inside, of the main channel is connected to the first part of the sheet metal structure. This advantageously allows the oil to enter directly into the co-rotating main channel.

[0026] Further advantages emerge from the dependent claims. The invention is not limited to the combination of features in the claims. Further possible combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent to those skilled in the art, particularly from the problem and / or the problem posed by comparison with the prior art.

[0027] The invention will now be explained in more detail using schematic illustrations:

[0028] Figure 1 shows an oblique view of a drive according to the invention with a toothed ring, in particular for a rotatably mounted drum.

[0029] Figure 2 shows the drive in side view.

[0030] Figure 3 shows a cross section through an upper area of ​​the gear ring.

[0031] Figure 4 shows a cross section through a lower area of ​​the gear ring.

[0032] As shown in the figures, the drive has a toothed ring which is composed of ring segments 1 arranged one behind the other in the circumferential direction with respect to the axis of rotation of the toothed ring, connected to one another and each provided with a toothing 20.

[0033] Each ring segment has a support area, wherein the toothing 20 of the respective ring segment 1 is arranged radially outside the support area.

[0034] The teeth 20 of the ring segments 1 form the external teeth of the toothed ring.

[0035] A pinion connected to a driving shaft 3 in a rotationally fixed manner, in particular by means of a key, is in engagement with its external toothing with the external toothing of the toothed ring.

[0036] A housing surrounds the pinion and the gear ring teeth to ensure lubrication by oil without oil leaking into the environment.

[0037] For this purpose, the housing is composed of housing segments 2 arranged one behind the other in the circumferential direction relative to the rotational axis of the gear ring. Sealing material is interposed between the housing segments 2 that are closest to each other in this circumferential direction, so that the housing segments 2 are connected to each other in an oil-tight manner. Alternatively, a welded connection of the housing segments 2 is also possible. The gear ring is attached to a driven drum (not shown in the figures).

[0038] The housing is supported by support parts 4, which are installed on the floor of an industrial plant.

[0039] Radially within the toothing of the gear ring, a sheet metal structure is formed which forms channels to collect oil, keep it away from the seal 33 and return it to the oil sump.

[0040] The seal 33 is designed as a ring seal and is made of low-wear material because it is arranged between the stationary housing and the rotating section of the sheet metal structure.

[0041] The rotating section of the sheet metal structure is non-rotatably connected to the supporting areas of the ring segments 1.

[0042] Since the sheet metal structure is arranged on the end faces of the gear ring and radially within the external toothing of the gear ring, the oil in the uppermost region of the gear ring flows laterally, particularly in both axial directions, out of the external toothing of the gear ring, as shown in Figure 3. A significant portion of this flows into the main channel 30 formed by the sheet metal structure, which is directly axially adjacent to the respective end face of the gear ring.

[0043] For this purpose, the main channel 30 is permeable to oil at its radially outer edge region, so that the oil can flow into the main channel 30. However, the radially inner edge region of the main channel 30 is impermeable to oil.

[0044] This main channel 30 is annular and shaped like an annular groove extending circumferentially relative to the rotational axis of the gear ring. The ring axis is aligned coaxially with the rotational axis of the gear ring.

[0045] Axially adjacent to the main channel, a first side channel 31 is formed by the sheet metal structure, arranged concentrically therewith. A separating plate 32, which extends from the radially inner end of the first side channel 31 into the first side channel 31, divides the first side channel 31 into two interconnected areas. The first side channel 31 is arranged axially between the seal 33, in particular an annular seal, and the main channel 30.

[0046] The area covered by the main channel 30 in the radial direction, in particular the radial distance area covered by the main channel 30, in particular with respect to the axis of rotation of the toothed ring, overlaps with the radial distance area covered by the seal 33 and with the radial distance area covered by the first side channel 31.

[0047] Radial distance area as well as with the radial distance area covered by the separating plate 32.

[0048] The first side channel 31 is axially adjacent to the seal 33.

[0049] By means of the arrangement of the two channels and the division of the first side channel 31 by means of the separating plate 32, a multi-stage safety is achieved with regard to keeping oil away from the seal 33.

[0050] The seal 33 seals the rotating part of the sheet metal structure, which is non-rotatably connected to the toothed ring.

[0051] The axial width of the main channel 30 is greater than the axial width of the first side channel 31.

[0052] As shown in Figure 4, the outer diameter of the first side channel 31 is smaller than that of the main channel 30. Therefore, the oil flows from the first side channel 31 into the main channel 30 in the lower region shown in Figure 4. For this purpose, the side wall of the main channel 30 is permeable to oil.

[0053] At the radially outer edge region of the main channel 30, the oil flows out of the main channel 30 into the oil sump, in particular through the same recesses through which it entered the main channel 30 in the upper region shown in Figure 3.

[0054] Since the separating plate 32 is radially less extended than the first side channel 31, the oil of the first side channel 31 is not divided into two areas, but flows entirely into the main channel 30. The oil level in the housing is designed to be so high that the engaging area of ​​the pinion is covered with oil.

[0055] In addition, the pinion can also drive an oil feed wheel, which causes an oil flow within the oil sump and thus prevents oil residues and the like from settling.

[0056] The oil feed wheel is constructed from a particularly abrasion-resistant, involute-toothed gear, whose involute external teeth mesh with the external teeth of the pinion, and is located in the oil, in particular at least partially below the oil level. The oil feed wheel is preferably constructed as a plastic injection-molded part.

[0057] In further embodiments according to the invention, the part of the sheet metal structure forming the main channel 30 and the first side channel 31 is connected to the toothed ring in a rotationally fixed manner, in particular is designed to rotate with it.

[0058] List of reference symbols

[0059] 1 ring segment 2 housing segment

[0060] 3 driving shaft

[0061] 4 Support part

[0062] 20 External toothing of the ring segment 21 Oil

[0063] 30 main channel

[0064] 31 first side channel

[0065] 32 Divider 33 Seal

Claims

Patent claims:

1. Drive, comprising a toothed ring and a pinion, in particular wherein the external toothing of the pinion is in engagement with the external toothing of the toothed ring, characterized in that a housing which is at least partially filled with oil surrounds the external toothing of the toothed ring and is sealed off from the toothed ring.

2. Drive according to claim 1, characterized in that the toothed ring is composed of ring segments arranged one behind the other in the circumferential direction - with respect to the direction of rotation of the toothed ring - and in particular each connected to one another.

3. Drive according to one of the preceding claims, characterized in that each ring segment has an external toothing and a support area, wherein the external toothing - with respect to the direction of rotation of the toothed ring - is arranged radially outside the support area, in particular and adjoins the support area.

4. Drive according to one of the preceding claims, characterized in that the radial distance region covered by the housing overlaps with the radial distance region covered by the toothed ring and at least partially also includes larger radial distances than the toothed ring.

5. Drive according to one of the preceding claims, characterized in that the housing is composed of housing segments arranged one behind the other in the circumferential direction - with respect to the direction of rotation of the toothed ring - in particular each connected to each other, in particular wherein each housing segment has a conical region on its radial inner side, in particular wherein the associated cone axis is aligned coaxially to the axis of rotation of the toothed ring, in particular wherein the closest adjacent to each other in the circumferential direction Housing segments are connected to each other in an oil-tight manner, in particular by means of an intermediate flat seal.

6. Drive according to one of the preceding claims, characterized in that a sheet metal structure is provided on each of the two end faces of the toothed ring, which forms an annular main channel and an annular first side channel, in particular wherein the axis of rotation of the toothed ring is aligned coaxially with the ring axis of the main channel and / or with the ring axis of the first side channel.

7. Drive according to one of the preceding claims, characterized in that a separating plate is arranged in the first side channel, which has a smaller radial extent than the first side channel, wherein the radial distance region covered by the first side channel comprises the radial distance region covered by the separating plate, in particular wherein the first side channel has greater radial distances than the first side channel.

8. Drive according to one of the preceding claims, characterized in that a first part of the sheet metal structure is connected in a rotationally fixed manner to the toothed ring and / or to the support area and the second, in particular remaining, part of the sheet metal structure is firmly connected to the housing.

9. Drive according to one of the preceding claims, characterized in that the housing surrounds the external toothing of the toothed ring and is designed to be sealed towards the supporting region of the toothed ring or towards the first part of the sheet metal structure, in particular by interposing an annular seal whose ring axis is aligned coaxially with the axis of rotation of the toothed ring.

10. Drive according to one of the preceding claims, characterized in that the main channel has on its radially outer circumference, in particular on its radial outer side, continuous recesses, in particular which are permeable to oil.

11. Drive according to one of the preceding claims, characterized in that the main channel and the first side channel are each impermeable to oil on their respective radially inner circumference, in particular on their respective radial inner side.

12. Drive according to one of the preceding claims, characterized in that a side wall of the main channel also functions as a side wall of the first side channel and has a recess permeable to oil.

13. Drive according to one of the preceding claims, characterized in that the annular seal is arranged axially adjacent to the first side channel, in particular and adjacent to it.

14. Drive according to one of the preceding claims, characterized in that the annular cross-section of the seal is conical, in particular wherein the cone axis is aligned coaxially to the axis of rotation of the toothed ring, in particular wherein the seal is fastened at its radially outer edge region to the housing segment (2) and is in sliding contact with its radially inner end region with the radially inner edge region of the first part of the sheet metal structure connected to the toothed ring, which part forms the main channel (30) and the first side channel (31), or that the annular cross-section of the seal is triangular, wherein the longest side of the triangle touches the first part of the sheet metal structure, in particular and thus seals off against this first part of the sheet metal structure.

15. Drive according to one of the preceding claims, characterized in that the radially outer circumference, in particular the radial outside, of the main channel is connected to the second part of the sheet metal structure, wherein the radially inner circumference, in particular the radial inside, of the main channel is connected to the first part of the sheet metal structure.

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