STEPPED JOINT OF A PART ON A TRANSMISSION HOUSING

Abstract

A separable housing for a transmission wherein the transmission that is to be received in the separable housing has a gear shaft and at least two pinion shafts which are engaged with a gear that is arranged on the gear shaft. The separable housing has at least one first housing element and a second housing element that is connected to the first housing element by a joint of a part. The gear shaft and the at least two pinion shafts can be received in the joint of a part in receptacles on the housing. The joint of a part has a first part-joint stepped section and a second part-joint stepped section, each stepped section forming a different horizontal level in the joint of a part and each stepped section being formed between two of the receptacles of two of the shafts, the stepped sections also being complementarily formed.

Claims

1. A divisible housing for a gearing which can be received in the divisible housing of a gearing of a fluid machine, having a large-gear shaft and having at least two pinion shafts which mesh with a large gear arranged on the large-gear shaft, wherein the divisible housing comprises: at least one first housing element and one second housing element which is connected to the first housing element via a parting joint, and the large-gear shaft and the at least two pinion shafts can be received in receptacles on the housing element in the parting joint, wherein the parting joint has a first parting-joint offset and a second parting-joint offset, which form in each case two different horizontal levels in the parting joint and which are arranged in each case between two of the receptacles of two of the shafts and which are of complementary form with respect to one another.

2. The divisible housing as claimed in claim 1, wherein the first and the second housing element have in each case one mutually corresponding step which forms one of the parting-joint offsets.

3. The divisible housing as claimed in claim 1, wherein the receptacles for the two pinion shafts are arranged to both sides of the receptacle for the large-gear shaft on the housing elements in the parting joint.

4. The divisible housing as claimed in claim 1, wherein a height difference, formed by one of the parting-joint offsets, of the two different horizontal levels is defined in a manner dependent on dimensions of the shafts and/or pinions arranged on the shafts and/or in a manner dependent on a structural space requirement.

5. The divisible housing as claimed in claim 1, wherein the first and/or the second parting-joint offset is sealed off using/in each case using a sealing element which has a form substantially corresponding to the respective parting-joint offset.

6. The divisible housing as claimed in claim 1, wherein the sealing element is a sealing bar and/or in that the sealing element is composed of metal.

7. The divisible housing as claimed in claim 5, wherein the sealing element is arranged over the parting-joint offset, and/or recessed in the parting-joint offset.

8. The divisible housing as claimed in claim 5, further comprising: a sealing device or an O-ring arranged on the sealing element, wherein, the sealing device or the O-ring lies axially in axial receptacles which are formed on the housing elements in the region of the parting-joint offset.

9. The divisible housing as claimed in claim 8, wherein the sealing element has a groove or a projection in which or on which the sealing device is arranged, or into which the O-ring is laid or onto which the O-ring is mounted.

10. The divisible housing as claimed in claim 1, wherein the first and the second housing element are a lower case and an upper case of the gearing housing, and/or in that the first and the second housing element are oriented and/or centered relative to one another by means of vertically mutually staggered step surfaces of steps which form the parting-joint offsets, and/or in that the first and the second housing element are pinned to one another and/or are screwed to one another.

11. The divisible housing as claimed in claim 10, wherein the divisible housing has a third housing element which is connected to the first housing element or to the second housing element via a further parting join.,

12. The divisible housing as claimed in claim 11, wherein the gearing has at least two further pinion shafts which mesh with the large gear or with a further large gear.

13. The divisible housing as claimed in claim 12, wherein the parting-joint offsets are formed in the parting joint, and the further parting joint is formed as a further, non-offset parting joint, such that the receptacles, arranged on the housing elements in the parting joints, of the at least two and of the at least two further pinion shafts form a trapezoid.

14. A fluid machine, turbine, turbocompressor, multi-stage geared compressor or pump, comprising: the divisible housing as claimed in claim 1, and a gearing which is received in the divisible housing and which has a large-gear shaft and at least two pinion shafts which mesh with a large gear arranged on the large-gear shaft, wherein the at least two pinion shafts and the large-gear shaft are received in the receptacles on the housing elements in the parting joint.

15. The divisible housing as claimed in claim 2, wherein the first and the second housing element have two mutually corresponding steps which form the parting-joint offsets.

16. The divisible housing as claimed in claim 6, wherein the metal comprises aluminum.

17. The divisible housing as claimed in claim 7, wherein the sealing element is arranged over the parting-joint offset in a manner screwed to the housing elements and/or recessed in the parting-joint offset so as to completely cover the parting-joint offset.

18. The divisible housing as claimed in claim 11, wherein the further parting joint comprises a non-offset parting joint, and wherein the third housing element is a cover, the first housing element is a lower case and the second housing element is an upper case of the divisible housing, wherein the third housing element is connected to the second housing element via the further non-offset parting joint.

19. The divisible housing as claimed in claim 12, wherein the at least two further pinion shafts are arranged in receptacles on the second and third housing elements in the further parting joint which comprises a non-offset parting joint.

20. The divisible housing as claimed in claim 13, wherein the receptacles of the at least two pinion shafts and the receptacles of the at least two further pinion shafts form in each case base sides of the trapezoid.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0107] In the figures:

[0108] FIG. 1 shows a view (front view) of a divided housing, which has a cover, an upper case and a lower case, for a gearing of a multi-stage geared compressor,

[0109] FIG. 2 shows a sketch illustrating the shaft arrangement in the case of the divided housing for a gearing of a multi-stage geared compressor from FIG. 1,

[0110] FIG. 3 is a three-dimensional illustration of the divided housing, which has a cover, an upper case and a lower case, for a gearing of a multi-stage geared compressor as per FIG. 1,

[0111] FIG. 4 shows a view (rear view) of a sealing bar for sealing off a parting-joint offset in the case of the parting joint between the lower case and the upper case of the divided housing for a gearing of a multi-stage geared compressor as per FIGS. 1 to 3,

[0112] FIG. 5 shows a view (sectional side view; section line A-A) of a sealing bar for sealing off a parting-joint offset in the case of the parting joint between the lower case and the upper case of the divided housing for a gearing of a multi-stage geared compressor as per FIGS. 1 to 3,

[0113] FIG. 6 shows a view (front view) of a sealing bar for sealing off a parting-joint offset in the case of the parting joint between the lower case and the upper case of the divided housing for a gearing of a multi-stage geared compressor as per FIGS. 1 to 3,

[0114] FIG. 7 shows a sectional view (section line B-B as per FIG. 4) of a sealing bar for sealing off a parting joint offset in the case of the parting joint between the lower case and the upper case of the divided housing for a gearing of a multi-stage geared compressor as per FIGS. 1 to 3, and

[0115] FIG. 8 shows a detail view (detail C as per FIG. 5) of a sealing bar for sealing off a parting joint offset in the case of the parting joint between the lower case and the upper case of the divided housing for a gearing of a multi-stage geared compressor as per FIGS. 1 to 3.

DETAILED DESCRIPTION OF INVENTION

[0116] Exemplary embodiment: doubly stepped first parting joint in the case of a divided gearing housing for a gearing of a multi-stage geared compressor with parting-joint offsets sealed off by means of sealing bars

[0117] FIGS. 1 and 3 (front and three-dimensional view) and FIG. 2 (shaft arrangement) show views of a divided housing 1 (gearing housing) with lower case 2, upper case 3 and cover 6 for a gearing 100 of a multi-stage geared compressor which is provided for air separation.

[0118] The divided housing 1 has the illustrated lower case 2, the illustrated upper case 2 arranged over or above the lower case 2, and the illustrated cover 6 arranged over or above the upper case 3—all of these advantageously being composed of steel.

[0119] The lower case 2 and the upper case 3 are connected to one another via a first, doubly stepped, horizontal parting joint 4; the upper case 3 and the cover 6 are connected to one another via a second, horizontal and non-stepped parting joint 7.

[0120] The multi-stage geared compressor is composed of eight (compressor) stages (A to H) which are realized by means of a gearing 100 which is received in the divided housing 1 and which has four pinion shafts A/B 10, C/D 11, E/F 20, G/H 21 of the gearing 100, which are in engagement with a large gear 101, arranged on a large-gear shaft 102, of the gearing 100. On the free ends of the four pinion shafts A/B 10, C/D 11, E/F 20, G/H 21 there are arranged turbo impellers which, as shown in FIG. 2, are received in spiral housings 25 (flow-guiding components) which are arranged externally with respect to the gearing housing 1.

[0121] All four pinion shafts A/B 10, C/D 11, E/F 20, G/H 21 are arranged around a large gear 101 or large-gear shaft 102 and are in engagement, by means of toothings, with the large gear 101.

[0122] Here, the first A/B 10 and the second pinion shaft B/C 11 (stages 1 to 4)—in the first, doubly stepped, horizontal parting joint 4—are arranged to both sides of the large gear 101 or of the large-gear shaft 102; the third E/F 10 and the fourth pinion shaft G/H 21 (stages 5 to 8)—in the second, horizontal and non-stepped parting joint 7—are arranged above the large gear 101 or the large-gear shaft 102.

[0123] To permit efficient engagement of the pinion shafts A/B 10, C/D 11, E/F 20, G/H 21, the pinion shafts A/B 10, C/D 11, E/F 20, G/H 21 are—with regard to their spacing to the large-gear shaft 102—arranged such that the pitch circles of the pinion shafts A/B 10, C/D 11, E/F 20, G/H 21 each contact the pitch circle of the large gear 101.

[0124] The large gear 101 or the large-gear shaft 102 is driven by means of an electric motor (not illustrated). The sealing of the compressor stages with respect to the gearing housing 1 is realized by means of Kohler rings.

[0125] As shown in FIGS. 1 and 3, the lower case 2, on its bottom side which together with the top side of the upper case 3 forms the first, doubly stepped second, horizontal parting joint 4, has receptacles 44, 45, that is to say the shaft seats 44, 45, for the shaft 102 of the large gear 101 (axis of rotation of the large-gear shaft or large-gear shaft central position 17) and the first A/B 10 (arranged to the right of the large-gear shaft 102 in the front view) and the second pinion shaft C/D 11 (arranged to the left of the large-gear shaft 102 in the front view) (axes of rotation 14, 15 of the pinion shafts 10, 11).

[0126] As shown in FIGS. 1 and 2, the first, doubly stepped parting joint 4 has two complementary offset points 5a of equal height (right-hand step arranged to the right of the large-gear shaft 102 in the front view), (left-hand step arranged to the left of the large-gear shaft 102 in the front view) 5b (“doubly stepped”) with in each case a height of approximately 400 mm.

[0127] Said step-like offset points 5a, 5b are formed in each case by corresponding steps 8 both in the lower case 2 of the housing 1 or on the top side thereof and also correspondingly in the upper case 3 of the housing 1 or on the bottom side thereof.

[0128] If it is the case here, as illustrated in FIGS. 1 to 3, that the parting-joint offsets 5a, 5b or the steps 8 are of complementary form—in this case specifically in an upturned U-shaped profile—then it is the case as a result that the pinion shaft receptacles 40, 41, 42, 43 (and thus also the pinion shafts A/B 10, C/D 11 or the pinion shaft central points/positions 14, 15 thereof) migrate downward in the first, doubly stepped, horizontal parting joint 4 (with respect to the large-gear shaft receptacle 44, 45 or the large-gear shaft 102 or shaft central point/position), whereby structural space is thus obtained in the second, horizontal and non-stepped parting joint 7.

[0129] That is also to say that, as illustrated in FIGS. 1 to 3, the first A/B 10 and the second pinion shaft C/D 11 lie no longer in the same horizontal plane 12b or 13b as the large-gear shaft 102, but rather—correspondingly to the parting-joint offsets 5a, 5b or step 8 that are formed—in lower horizontal planes 12a and 13a or at lower heights 12a, 13a. It is now only the case that the pitch circles of first A/B 10 and second pinion shaft C/D 11 and large gear 101 make contact.

[0130] If the first A/B 10 and the second pinion shaft C/D 11 (duly) lie below the large-gear shaft 102 but jointly in the first, doubly stepped, horizontal parting joint 4, this is expedient from an assembly and cost aspect.

[0131] To permit alignment of lower case 2 and upper case 3, the vertical step surfaces 9 are staggered with respect to one another. The lower case 2 and upper case 3 are, as shown in FIGS. 1 and 3, pinned 33 by means of centering pins and screwed 32. The upper case 3 and the cover 6 are also pinned 33 and screwed 32 as shown in FIG. 3.

[0132] As is also shown in FIGS. 1 and 3, the upper case 3, on its top side—which together with the bottom side of the cover 6 forms the second, horizontal and non-stepped parting joint 7—has the receptacles 46, 48, that is to say the shaft/bearing seats 46, 48 for the third E/F 20 (arranged on the right in the front view) and the fourth pinion shaft G/H 21 (arranged on the left in the front view). The corresponding receptacles 47, 49 or shaft/bearing seats 47, 49 for the third E/F 20 and the fourth pinion shaft G/H 21 are also provided in the bottom side of the cover 6.

[0133] Here, both of the two pinion shafts 20, 21 lie in a (common) horizontal plane—as per the second, non-stepped and horizontal parting joint 7.

[0134] If, as is possible here, it is sought for not only the third pinion shaft E/F 20 but also the fourth pinion shaft G/H 21 to be received in the second, horizontal and non-stepped parting joint 7, it is possible for a fourth pinion shaft which must otherwise be provided as a plug-in pinion shaft (as a cumbersome plug-in pinion shaft arrangement) to be omitted.

[0135] If the third E/F 20 and the fourth pinion shaft G/H 21 lie jointly in the second, horizontal and non-stepped parting joint 7, this is expedient from an assembly and cost aspect inter alia owing to the improved accessibility.

[0136] As illustrated in FIG. 2, the pinion shafts A/B 10, C/D 11, E/F 20, G/H 21 or the receptacles 40 to 43, 46 to 49 thereof or the pinion shaft central positions 14, 15, 16 (axis central points) thereof span a trapezoid 19, the two horizontally oriented base sides 22, 23 of which are formed by the pinion shafts A/B 10 and C/D 11 or the receptacles 40 to 43 thereof or the pinion shaft central positions 14, 15 thereof and by the pinion shafts E/F 20 and G/H 21 or the receptacles 46 to 49 thereof or the pinion shaft central positions 16 (axis central points) thereof.

[0137] That is to say, the trapezoid 19 “lies flat” on one of its base sides 22, 23 (“height” of the trapezoid h2), resulting in the flat structural space. In the case of corresponding housings with a plug-in pinion arrangement, the corresponding polygon (through the shaft central points/receptacles) stands on one corner and is of correspondingly tall construction.

[0138] A weakening of the housing 1 or of the gearing cases 2, 3 is compensated for by stiffening means 24 arranged in stellate fashion around the large-gear shaft receptacle 44, 45 on the gearing cases 2, 3. [0139] Sealing of the first, doubly stepped, horizontal parting joint 4 by means of (two) sealing bars 30 with O-ring 31 (FIGS. 1, 2 and 4 to 8).

[0140] The lubrication of the gearing 100 arranged in the housing 1 is realized by means of oil sump lubrication, wherein the oil sealing of the first, doubly stepped parting joint 4, in particular of the two parting-joint offsets 5a, 5b there or of the steps 8 in the lower case 2 and the upper case 3, is of central importance.

[0141] For this purpose, as shown in particular in FIG. 1, FIG. 3 and FIGS. 4 to 8, the gearing housing 1 provides the use of two sealing elements 30, that is to say two sealing bars 30, which are identical (in this case owing to the identical/complementary form of the two parting-joint offsets 5a, 5b or steps 8).

[0142] As shown in FIGS. 1 and 3 and in particular FIGS. 4 to 8, the sealing bar 30 is in each case a rod-shaped component, in this case of a length of approximately 450 mm and a width of approximately 70 mm, which corresponds to the shape of the first or second or respective parting-joint offset 5a, 5b or which corresponds in terms of its outer diameter to the shape of the first or second or respective parting-joint offset 5a, 5b.

[0143] As shown in FIGS. 4 and 6, the sealing bar 30 has, in encircling ring-shaped fashion at its edges, screw seats 34, 35 by means of which said sealing bar is screwed 32 to the lower case 2 and to the upper case 3.

[0144] As shown in FIGS. 4 and 5, for the sealing of the respective parting-joint offset 5a, 5b, there is laid onto the sealing bar 30 a sealing means 31, that is to say in this case an O-ring (which realizes the sealing action) is laid into a groove on the sealing bar 30 or on the inner side thereof.

[0145] As shown in particular in FIGS. 1 and 3, said sealing bars 30—in each case with the O-ring 31 laid in the groove 36—are screwed 32 over the respective parting-joint offset 5a or 5b in recessed fashion from the outside, wherein said sealing bar completely covers the respective parting-joint step 5a or 5b.

[0146] For this purpose, as shown in FIGS. 1 and 3, for each sealing bar 30, on the housing elements 2, 3 or on the lower case 2 and on the upper case 3, there are arranged receptacles 37 (on the lower case 2) and 38 (on the upper case 3), that is to say a sealing-bar seat 37 (on the lower case 2) and a sealing-bar seat 38 (on the upper case 3), in the form of axial recesses 37, 38 on the lower case 2 and on the upper case 3, on which the respective sealing bar 30 lies (by means of its edge regions), as shown or illustrated in particular in FIGS. 1 and 2.

[0147] The production of the recessed sealing-bar seats or sealing-bar seats 37, 38 on the gearing housing 1 or on the lower case 2 and on the upper case 3 is performed during the spindling-out of the receptacles 40, 41, 42, 43 or bearing seats 40, 41, 42, 43 of the first A/B 10 and second C/D pinion shaft 11, and does not necessitate any further machining steps.

[0148] Owing to its rod-shaped or bar-shaped form which is adapted to the respective parting-joint offset 5a or 5b and (and which is of horizontally compact construction in the case of a vertical arrangement) and the (thereby also permitted completely) recessed arrangement of the respective sealing bar 30 on the housing elements 2, 3, said sealing bar does not pose an obstruction to adjacent (flow-guiding) components; the spiral housing 25 and the device for spiral setting can still be mounted, but the sealing bar 30 is of extremely compact construction in the horizontal direction, whereby the structural space requirement or a structural space limitation/obstruction in said direction is as small/minor as possible.

[0149] Then, if the O-ring 31 of the respective sealing bar 30 lies axially in the respective axial sealing-bar seats 37, 38 or axial recesses 37, 38 formed on the housing elements 2, 3 or on the lower case 2 and on the upper case 3 in the region of the respective parting-joint offset 5a or 5b, or is screwed 32 axially to the housing elements 2, 3 or to the lower case 2 and to the upper case 3, the sealing bars 30 thus in this case have an axial sealing action, whereby it is possible to dispense with a fit for the centering of the sealing bars 30 in the housing elements 2, 3.

[0150] Said sealing bars 30 with said O-rings 31 (lying axially thereon) furthermore have the advantage that the sealing direction acts counter to the clamping force of the part screw connection. Also, regardless of the sealing means arrangement, that is to say the arrangements of the O-ring 31, on the sealing bar 30, the design and assembly of the parting-joint screw connection/pin connection 32, 33 remain unaffected.

[0151] Even though the invention has been illustrated and described in more detail on the basis of the one or more preferred exemplary embodiments, the invention is not restricted by the disclosed examples, and other variations may be derived from these by a person skilled in the art without departing from the scope of protection of the invention.