Housing

Abstract

A housing for a work implement has a first housing shell with first outer wall and a second housing shell with second outer wall. The first and second outer walls contact each other along a separation plane. The first housing shell has a first rib extending transversely to the separation plane and projecting past the separation plane into the second housing shell. First measuring points are located in the separation plane. The first rib has a first rib height measured in transverse direction from a first measuring point to a first end of the first rib facing the second housing shell. The second housing shell has a second shell height measured in transverse direction from the same first measuring point to an inner side of the second housing shell. The first measuring points include measuring points where the first rib height is at least 15% of the second shell height.

Claims

1.-16. (canceled)

17. A housing for a hand-guided work implement, the housing comprising: a first housing shell comprising a first outer wall; a second housing shell comprising a second outer wall; wherein the first outer wall and the second outer wall at least partially contact each other along a separation plane; wherein the first housing shell comprises a first rib extending in a transverse direction transversely to the separation plane; wherein the first rib projects past the separation plane into the second housing shell; wherein first measuring points are located in the separation plane; wherein the first rib comprises a first rib height measured in the transverse direction, beginning at one of the first measuring points located in the separation plane, to a first end of the first rib, wherein the first end of the first rib faces the second housing shell; wherein the second housing shell comprises a second shell height measured in the transverse direction, beginning at the same first measuring point located in the separation plane where the first rib height is measured, to a second inner side of the second housing shell, wherein the second inner side faces the first housing shell; wherein the first measuring points located in the separation plane include at least one first measuring point at which the first rib height amounts to at least 15% of the second shell height.

18. The housing according to claim 17, wherein the second housing shell comprises a second rib, wherein the second rib, beginning at the second outer wall of the second housing shell, extends in the transverse direction toward the first housing shell, wherein the second rib projects past the separation plane, and wherein the second rib projects into the first housing shell.

19. The housing according to claim 18, wherein second measuring points are located in the separation plane, wherein the second rib comprises a second rib height measured in the transverse direction, beginning at one of the second measuring points located in the separation plane, to a second end of the second rib, wherein the second end of the second rib faces the first housing shell, wherein the first housing shell comprises a first shell height measured in the transverse direction, beginning at the same second measuring point located in the separation plane where the second rib height is measured, to a first inner side of the first housing shell, wherein the first inner side of the first housing shell faces the second housing shell, and wherein the second measuring points located in the separation plane include at least one second measuring point at which the second rib height amounts to at least 15% of the first shell height.

20. The housing according to claim 18, wherein the first rib comprises a first maximum wall thickness measured perpendicularly to the transverse direction in a wall thickness direction and wherein a rib distance measured in the wall thickness direction between the first rib and the second rib amounts to less than the first maximum wall thickness.

21. The housing according to claim 20, wherein the rib distance amounts to at least 1% of the first maximum wall thickness.

22. The housing according to claim 17, wherein the first rib comprises a first region arranged in relation to the second outer wall at a first distance measured in the separation plane perpendicularly to the second outer wall.

23. The housing according to claim 17, wherein the first rib is fixed at the first outer wall.

24. The housing according to claim 23, wherein the first rib is embodied monolithic with the first outer wall.

25. The housing according to claim 17, wherein the first rib comprises a first maximum wall thickness measured perpendicularly to the transverse direction in a wall thickness direction, wherein the first rib comprises a first shell distance in relation to the second housing shell measured in the transverse direction, and wherein the first shell distance is greater than 40% of the first maximum wall thickness of the first rib.

26. The housing according to claim 17, wherein the first housing shell comprises two of said first rib and wherein said two first ribs cross each other and comprise a crossing point, viewed in the transverse direction.

27. The housing according to claim 26, wherein the crossing point, viewed in the transverse direction, comprises a first cross distance in relation to the first housing wall, and wherein said two first ribs, beginning at the crossing point, extend up to the first housing wall.

28. The housing according to claim 17, wherein the first housing shell comprises a plurality of said first rib, wherein the second housing shell comprises a plurality of said second rib, wherein the plurality of said first rib and the plurality of said second rib comprise an added-up total length measured in the separation plane, wherein the plurality of said first rib and the plurality of said second rib are delimited in the separation plane by a virtual enveloping polygon, wherein the virtual enveloping polygon encloses a polygon surface, and wherein a quotient of the added-up total length and the polygon surface amounts to at least 0.2 mm.sup.−1.

29. The housing according to claim 17, wherein the first rib comprises a first cutout, wherein the second housing shell comprises a second reinforcement rib projecting in the transverse direction into the first cutout so that the second reinforcement rib crosses the cutout of the first rib in a direction perpendicularly to the transverse direction.

30. The housing according to claim 17, wherein the first housing shell and the second housing shell are injection molded parts.

31. The housing according to claim 17, wherein the housing is a grip housing and wherein an operating element for operating the work implement is arranged at the grip housing.

32. The housing according to claim 17, wherein the first rib intersects the separation plane across an added-up first length and wherein the first rib height at the first measuring points located in the separation plane across at least half of the added-up first length of the first rib amounts to at least 30% of the second shell height.

Description

[0027] An embodiment of the invention will be explained in the following with the aid of the drawing. It is shown in:

[0028] FIG. 1 a schematic side view of a work implement with a housing;

[0029] FIG. 2 a perspective illustration of a housing;

[0030] FIG. 3 a perspective illustration of a first housing shell of the housing according to FIG. 2 with a view of an inner side of the first housing shell;

[0031] FIG. 4 a perspective illustration of a second housing shell of the housing according to FIG. 2 with a view of an inner side of the second housing shell;

[0032] FIG. 5 a side view in a transverse direction of the inner side of the first housing shell of FIG. 3;

[0033] FIG. 6 a side view in transverse direction of the inner side of the second housing shell of FIG. 4;

[0034] FIG. 7 a side view of the first housing shell of FIG. 3 perpendicular to the transverse direction;

[0035] FIG. 8 a side view of the second housing shell of FIG. 4 perpendicular to the transverse direction;

[0036] FIG. 9 a side view of the first housing shell of FIG. 3 perpendicular to the transverse direction;

[0037] FIG. 10 a side view of the second housing shell of FIG. 4 perpendicular to the transverse direction;

[0038] FIG. 11 a side view of the housing of FIG. 2 perpendicular to the transverse direction;

[0039] FIG. 12 a section along the section plane XII-XII of FIG. 11;

[0040] FIG. 13 a section along the section plane XIII-XIII of FIG. 12;

[0041] FIG. 14 a detail of the section illustration of FIG. 13;

[0042] FIG. 15 a section along the section plane XV-XV of FIG. 12;

[0043] FIG. 16 a section along the section plane XVI-XVI of FIG. 12;

[0044] FIG. 17 a section along the section plane XVII-XVII of FIG. 11:

[0045] FIG. 18 a detail of the section illustration of FIG. 17; and

[0046] FIG. 19 the detail of FIG. 18 with marking of the first and second ribs.

[0047] FIG. 1 shows a hand-guided work implement 2. The hand-guided work implement 2 is a blower. However, the work implement can also be, for example, a motor chainsaw, a trimmer, a cutoff machine or the like.

[0048] The work implement 2 comprises a housing 1. In the embodiment, the housing 1 is a grip housing. The housing can however also be any other type of housing, for example, a motor housing or the like.

[0049] As illustrated in FIG. 2, the work implement 2 comprises an operating element 5. In the embodiment, the operating element 5 is a throttle lever. By means of the operating element 5, a motor, not illustrated, of the work implement 2 can be operated. The operating element 5 projects from the housing 1.

[0050] The housing 1 comprises a first housing shell 10 and a second housing shell 20. The operating element 5 is arranged between the first housing shell 10 and the second housing shell 20.

[0051] The first housing shell 10 and the second housing shell 20 each are produced by a demolding method. The first housing shell 10 and the second housing shell 20 are made of plastic material. In the embodiment, the first housing shell 10 and the second housing shell 20 each are each produced by an injection molding method. The first housing shell 10 and the second housing shell 20 are injection molded parts. In FIG. 2, a transverse direction 50 is illustrated. When assembling the housing 1, the first housing part 10 and the second housing part 20 are caused to approach in transverse direction 50 so that they contact each other. The transverse direction 50 points in two opposite directions. The transverse direction 50 corresponds to the demolding direction for demolding the first housing shell 10. The transverse direction 50 corresponds to the demolding direction for demolding the second housing shell 20. Demolding direction refers to the direction in which the molds for the respective housing shells 10, 20 are to be removed upon demolding. This means the normal demolding direction. The demolding direction of gates for forming undercuts is not referred to by the term demolding direction.

[0052] FIG. 3 shows the first housing shell 10 in a perspective view. The first housing shell 10 comprises a first inner side 18 which is facing the second housing shell 20 in the assembled state of the housing 1. The first inner side 18 is delimited at least partially by a first outer wall 11. The first outer wall 11 forms a part of an outer side of the housing 1. The first outer wall 11 comprises a first end face 12. In the assembled state of the housing 1, the first end face 12 is facing the second housing shell 20. The first housing shell 10 is positioned with its first end face 12 at the second housing shell 20. The first end face 12 extends in the embodiment at least partially perpendicularly to the transverse direction 50.

[0053] FIG. 4 shows the second housing shell 20. The second housing shell 20 comprises a second inner side 28 which is facing the first housing shell 10 in the assembled state of the housing 1. The second inner side 28 is at least partially delimited by a second outer wall 21. The second outer wall 21 forms a portion of an outer side of the housing 1. The second outer wall 21 comprises a second end face 22. In the assembled state of the housing 1, the second end face 22 is facing the first housing shell 10. The second housing shell 20 is contacting with its second end face 22 the first housing shell 10. In the embodiment, the second end face 22 extends at least partially perpendicularly to the transverse direction 50.

[0054] The first outer wall 11 and the second outer wall 21 from an outer side of the housing 1. The term outer wall excludes transverse stays in the interior of the housing 1.

[0055] The housing shells 10 and 20 resting against each other are illustrated in particular in the FIGS. 13 to 15. When looking at FIGS. 3, 4 and 13 or 14 jointly, it can be seen that the first outer wall 11 of the first housing shell 10 and the second outer wall 21 of the second housing shell 20 are at least partially contacting each other along the separation plane 3. In the separation plane 3, the first housing shell 10 and the second housing shell 20 contact each other. The separation plane 3 extends transversely to the transverse direction 50. In the embodiment, the separation plane 3 extends perpendicularly to the transverse direction 50. In the separation plane 3, the first housing shell 10 and the second housing shell 20 contact each other in transverse direction 50.

[0056] As illustrated in FIG. 14, the first end face 12 of the first outer wall 11 comprises a first projection 19. The second end face 22 of the second outer wall 21 comprises a second projection 29. The first projection 19 projects in transverse direction 50 in the direction toward the second housing shell 20 past a first end face base 51 of the first end face 12 (FIG. 14). The second projection 29 projects in transverse direction 50 in the direction toward the first housing shell 10 past a second end face base 61 of the second end face 22. The second projection 29 is arranged closer to an outer side of the housing 1 than the first projection 19. An outer side of the second projection 29 is part of the outer side of the housing 1. The first projection 19 corresponds with the second projection 29. The second projection 29 and the first projection 19 overlap in relation to the transverse direction 50. The second projection 29 extends around an outer side of the first projection 19 at least partially. Upon assembly of the housing 1, the first housing shell 10 and the second housing shell 20 are positioned relative to each other by means of the first projection 19 and of the second projection 29. It can be provided that an outer side of the first projection 19 contacts an inner side of the second projection 29.

[0057] In transverse direction 50, the first projection 19 is delimited by a first front face 52. The first front face 52 is facing the second housing shell 20. The first front face 52 is positioned at the second end face base 61 of the second end face 22 of the second outer wall 21. The first front face 52 and the second end face base 61 are contacting each other in the separation plane 3.

[0058] The second projection 29 projects in transverse direction 50 in the direction toward the first housing shell 10 past the separation plane 3. The second projection 29 is delimited in transverse direction 50 by a second front face 62. Between the second front face 62 of the second projection 29 and the first end face base 51 of the second end face 12 a groove 31 is formed. The groove 31 is visible at the outer side of the housing 1. A bottom of the groove 31 is formed by the first projection 19. The groove 31 extends between the first housing shell 10 and the second housing shell 20. In the embodiment, the groove 31 extends outside of the separation plane 3.

[0059] As can be seen in FIGS. 2 to 4, the first outer wall 11 and the second outer wall 21 delimit a cavity in the interior of the housing 1. In the first housing shell 10 (FIG. 3), a first rib 13 is arranged in the cavity. The first rib 13 extends beginning at the first outer wall 11 of the first housing shell 10 in transverse direction 50 in the direction toward the second housing shell 20. As can be seen also in FIGS. 7 and 9, the first rib 13 projects in transverse direction 50 past the separation plane 3. The first rib 13 projects into the second housing shell 20. The first housing shell 10 comprises a plurality of first ribs 13, 33, 53, 54, 55 as can be seen in FIG. 3. All of these first ribs 13, 33, 53, 54, and 55 project past the separation plane 3. The first rib 13, 33, 53, 54, 55 is secured at the first outer wall 11. The first rib 13 is secured with its first rib base 14 at the first outer wall 11 (FIG. 13). The first rib 13, 33, 53, 54, 55 in the embodiment is embodied monolithic with the first outer wall 11. The first rib 13, 33, 53, 54, 55 is produced by an injection molding method together with the first outer wall 11. The first rib 13, 33, 53, 54, 55 extends on both sides of the separation plane 3.

[0060] The first ribs 33, 54, and 55 form together a structure (FIG. 3) extending circumferentially closed about the transverse direction 50.

[0061] At the inner side of the first outer wall 11, a first reinforcement rib 56 is arranged. The first reinforcement rib 56 is fixed at the first outer wall 11. The first reinforcement rib 56 extends beginning at the first outer wall 11 in transverse direction 50 in the direction toward the second housing shell 20. The first reinforcement rib 56 is arranged exclusively on one side of the separation plane 3. The first reinforcement rib 56 connects advantageously the first rib 13 with the first rib 53. In the embodiment, the first ribs 13 and 53 form together with the first reinforcement rib 56 a structure extending circumferentially closed about the transverse direction 50.

[0062] FIG. 4 shows the second housing shell 20 with a view of its inner side. The second housing shell 20 comprises a second rib 23. The second rib 23 extends beginning at the second outer wall 21 of the second housing shell 20 in transverse direction 50 in the direction toward the first housing shell 10. As also illustrated in FIGS. 8 and 10, the second rib 23 projects in transverse direction 50 past the separation plane 3. The second rib 23 projects into the first housing shell 10. The second rib 23 is arranged in the cavity (FIGS. 2 to 4). The first outer wall 11 and the second outer wall 21 delimit the cavity in the interior of the housing 1. The first rib 13 as well as the second rib 23 are arranged in the cavity. The second housing shell 20 comprises a plurality of second ribs 23, 43, 63 (FIG. 4). All of the second ribs 23, 43, and 63 project past the separation plane 3. The second rib 23, 43, 63 is secured at the second outer wall 21. The second rib 23 is secured with its second rib base 24 at the second outer wall 21 (FIG. 15). The second rib 23, 43, 63 in the embodiment is embodied monolithic with the second outer wall 21. The second rib 23, 43, 63 is produced together with the second outer wall 21 by an injection molding method.

[0063] As illustrated in FIG. 4, a second reinforcement rib 27 is arranged at the inner side of the second outer wall 21. The second reinforcement rib 27 is fixed at the second outer wall 21. Beginning at the second outer wall 21, the second reinforcement rib 27 extends in transverse direction 50 in the direction toward the first housing shell 10. The second reinforcement rib 27 is arranged exclusively at one side of the separation plane 3. The second reinforcement rib 27 connects advantageously the second rib 23 with the second rib 43. In the embodiment, the second ribs 23 and 43 form together with the second reinforcement rib 27 a structure extending circumferentially closed about the transverse direction 50.

[0064] FIG. 5 shows a side view of the inner side of the first housing shell 10 in transverse direction 50. FIG. 6 shows a side view of the inner side of the second housing shell 20 in transverse direction 50.

[0065] FIGS. 7 to 10 show side views of the first housing shell 10 and of the second housing shell 20 in directions perpendicular to the transverse direction 50. FIGS. 7 and 9 show in particular in which shape the first rib 13 projects past the separation plane 3. FIGS. 8 and 10 show in particular in which shape the second rib 23 projects past the separation plane 3.

[0066] FIG. 11 shows the housing 1 in the assembled state in a side view in the direction perpendicularly to the transverse direction 50. Between the first housing shell 10 and the second housing shell 20 the groove 31 is formed.

[0067] FIG. 12 shows a section through the housing 1 along the section plane XII-XII of FIG. 11. FIG. 12 shows the first inner side 18 of the first housing wall 11 of the first housing shell 10. The second rib 23 of the second housing shell 20 projects into the first housing shell 10. The first rib 13 of the first housing shell 10 and the second rib 23 of the second housing shell 20 are arranged immediately adjacent to each other. The first rib 13 of the first housing shell 10 and the second rib 23 of the second housing shell 20 extend parallel to each other in the section plane.

[0068] FIG. 13 shows a section through the housing 1 along the section plane XIII-XIII of FIG. 12. The section extends through the first rib 13 of the first housing shell 10. The transition between the first rib 13 and the first outer wall 11 is shown in dashed lines. The first rib 13 comprises a first end 15. The first end 15 is facing the second housing shell 20. The first end 15 is facing the second inner side 28 of the second housing shell 20. The first end 15 is the end face of the first rib 13.

[0069] The first end 15 is the rim of the first rib 13. The first end 15 is facing in transverse direction 50.

[0070] The first rib 13 comprises a first rib height r1a, r1b. The first rib height r1a, r1b is measured from the separation plane 3 to the first end 15 of the first rib 13. The first rib height r1a, r1b is measured in transverse direction 50. The first rib height r1a, r1b is measured perpendicularly to the separation plane 3. The first rib height r1a is measured beginning at a first measuring point M1a. The first rib height r1b is measured beginning at a first measuring point M1b. The first measuring point M1a, M1b is positioned in the separation plane 3. The first measuring point M1a, M1b is positioned in a region of the separation plane 3 that is intersected by the first rib 13. The first measuring point M1a is spaced apart from the first measuring point M1b. In the embodiment, the first rib height r1a is larger than the first rib height r1b.

[0071] The second housing shell 20 comprises a second shell height h2a, h2b. The second shell height h2a, h2b is measured from the separation plane 3 to the second inner side 28 of the second housing shell 20. The second inner side 28 of the second housing shell 20 corresponds to the inner side of the second outer wall 21 of the second housing shell 20. The second shell height h2a, h2b is measured in transverse direction 50. The second shell height h2a, h2b is measured perpendicularly to the separation plane 3. The second shell height h2a is measured beginning at the first measuring point M1a. The second shell height h2b is measured beginning at the first measuring point M1b. The second shell height h2a is measured beginning at the same first measuring point M1a as the first rib height r1a. The second shell height h2b is measured beginning at the same first measuring point M1b as the first rib height r1b. In the embodiment, the second shell height h2a is larger than the second shell height h2b.

[0072] In the separation plane 3, numerous first measuring points are existing based on which the first rib height and the second shell height can be determined. In the separation plane 3, there exists at least one first measuring point M1a, M1b at which the first rib height r1a, r1b amounts to at least 15%, in particular at least 30%, in particular at least 45%, preferably at least 60%, of the second shell height h2a, h2b. In the embodiment, the first rib height r1a amounts to at least 60% of the second shell height h2a. The first rib height r1b amounts to at least 60% of the second shell height h2b.

[0073] The first rib 13 intersects the separation plane 3 across an integrated first length 11. The first rib 13 comprises across at least half of the integrated first length 11 first measuring points where the first rib height amounts to at least 15%, in particular at least 30%, in particular at least 45%, preferably at least 60%, of the correlated second shell height. In the embodiment, the first rib 13, across at least 90% of the integrated first length 11, comprises first measuring points at which the first rib height amounts to at least 15%, in particular at least 30%, in particular at least 45%, preferably at least 60%, of the correlated second shell height. However, it can also be provided that the first rib 13 comprises across the entire integrated first length 11 first measuring points at which the first rib height amounts to at least 15%, in particular at least 30%, in particular at least 45%, preferably at least 60%, of the correlated second shell height.

[0074] FIG. 15 shows a section through the housing 1 along the section plane XV-XV of FIG. 12. The section extends through the second rib 23 of the second housing shell 20. The transition between the second rib 23 and the second outer wall 21 is indicated by dashed lines. The second rib 23 comprises a second end 25. The second end 25 is facing the first housing shell 10. The second end 25 is facing the first inner side 18 of the first housing shell 10. The second end 25 is the end face of the second rib 23. The second end 25 is the rim of the second rib 23. The second end 25 is oriented in transverse direction 50.

[0075] The second rib 23 comprises a second rib height r2a, r2b. The second rib height r2a, r2b is measured from the separation plane 3 to the second end 25 of the second rib 23. The second rib height r2a, r2b is measured in transverse direction 50. The second rib height r2a, r2b is measured perpendicularly to the separation plane 3. The second rib height r2a is measured beginning at a second measuring point M2a. The second rib height r2b is measured beginning at a second measuring point M2b. The second measuring point M2a, M2b is positioned in the separation plane 3. The second measuring point M2a, M2b is located in a region of the separation plane 3 that is intersected by the second rib 23. The second measuring point M2a is spaced apart from the second measuring point M2b. In the embodiment, the second rib height r2a is greater than the second rib height r2b.

[0076] The first housing shell 10 comprises a first shell height h1a, h1b. The first shell height h1a, h1b is measured from the separation plane 3 to the first inner side 18 of the first housing shell 10. The first inner side 18 of the first housing shell 10 corresponds to the inner side of the first outer wall 11 of the first housing shell 10. The first shell height h1a, h1b is measured in transverse direction. The first shell height h1a, h1b is measured perpendicularly to the separation plane 3. The first shell height h1a is measured beginning at the second measuring point M2a. The first shell height h1b is measured beginning at the second measuring point M2b. The first shell height h1a is measured beginning at the same second measuring point M2a as the first rib height r1a. The second shell height h2b is measured beginning at the second measuring point M2b as the second rib height r2b. In the embodiment, the first shell height h1a is greater than the second shell height h1b.

[0077] In the separation plane 3, there exist numerous second measuring points based on which the second rib height and the first shell height can be determined. In the separation plane 3 at least one second measuring point M2a, M2b exists at which the second rib height r2a, r2b amounts to at least 15%, in particular at least 30%, in particular at least 45%, preferably at least 60%, of the first shell height h1a, h1b. In the embodiment, the second rib height r2a amounts to at least 60% of the first shell height h1a. The second rib height r2b amounts to at least 60% of the first shell height h1b.

[0078] The second rib 23 intersects the separation plane 3 across an integrated second length l2. The second rib 23 comprises across at least half of the integrated second length l2 second measuring points at which the second rib height amounts to at least 15%, in particular at least 30%, in particular at least 45%, preferably at least 60%, of the correlated first shell height. In the embodiment, the second rib 23 comprises across at least 90% of the integrated second length l2 second measuring points at which the second rib height amounts to at least 15%, in particular at least 30%, in particular at least 45%, preferably at least 60%, of the correlated first shell height. It can also be provided that the second rib 23 across the entire integrated second length l2 comprises second measuring points at which the second rib height amounts to at least 15%, in particular at least 30%, in particular at least 45%, preferably at least 60%, of the correlated first shell height.

[0079] In the embodiment, the first housing shell 10 and the second housing shell 20 contact each other in relation to the transverse direction 50 only in a single plane. The position of the separation plane 3 is unequivocally determined. Should the first housing shell 10 and the second housing shell 20 in transverse direction have contact points in more than one plane, the position of the separation plane is to be determined such that the separation plane is perpendicular to the demolding direction and that a first surface area of the first outer wall is of the same size as the second surface area of the second outer wall. The first surface area is the surface area of the part of an outer surface of the first outer wall which, in the direction toward the second outer wall, projects past the separation plane to be determined and contacts the second outer wall. The second surface area is the surface area of the part of an outer side of the second outer wall which, in the direction toward the first outer wall, projects past the separation plane to be determined and contacts the first outer wall.

[0080] FIG. 16 shows a section along the section plane XVI-XVI of FIG. 12. The section plane extends perpendicularly to the separation plane 3 through the first rib 13 and through the second rib 23. The section plane extends through the first measuring point M1b illustrated in FIG. 13 and through the second measuring point M2b illustrated in FIG. 15. Correspondingly, the first housing shell 10 in the section plane according to FIG. 16 comprises the first shell height h1b. The second housing shell 20 comprises the second shell height h2b. The sum of the first shell height h1b and of the second shell height h2b provides the cavity height h of the housing 1. The cavity height h is measured in the transverse direction 50 between the first inner side 18 of the first housing shell 10 and the second inner side 28 of the second housing shell 20 at the level of the first measuring point M1b. The cavity height h is measured from the first groove base 14 of the first rib 13 to the second inner side 28 of the second housing shell 20.

[0081] The first rib 13 and the second rib 23 overlap each other in relation to the transverse direction 50 in an overlap region 32. The overlap region 32 comprises an overlap length l which is measured in transverse direction. The overlap length l corresponds to the sum of the first rib height r1b and of the second rib height r2b. The overlap length l amounts to at least 20%, in particular at least 30%, in particular at least 50%, in particular at least 60%, preferably at least 70% of the cavity height h. This applies in analogy to the overlap lengths at the first measuring point M1a, at the second measuring point M2a, and at the second measuring point M2b.

[0082] The first rib 13 comprises a first maximum wall thickness mw1. The first maximum wall thickness mw1 is measured in a wall thickness direction 49. The wall thickness direction 49 extends perpendicularly to the transverse direction 50. The wall thickness direction 49 extends parallel to the separation plane 3.

[0083] The second rib 23 is arranged at a rib distance a to the first rib 13. The rib distance a is measured in the wall thickness direction 49. In the embodiment, the rib distance a is constant in relation to the transverse direction 50. Independent of the distance in relation to the separation plane 3, the rib distance a is constant. The rib distance amounts to less than the first maximum wall thickness mw1, in particular less than two thirds of the first maximum wall thickness mw1.

[0084] The second rib 23 comprises a second maximum wall thickness mw2 measured in the wall thickness direction 49. The second maximum wall thickness mw2 in the embodiment is of the same size as the first maximum wall thickness mw1. However, it can also be provided that the first maximum wall thickness mw1 and the second maximum wall thickness mw1 differ in size.

[0085] The rib distance a amounts to at least 10%, in particular at least 20%, of the first maximum wall thickness mw1. It can also be provided that the rib distance a amounts to at least 1%, in particular at least 5%, of the first maximum wall thickness mw1.

[0086] The first rib 13 comprises in relation to the second housing shell 20 a first shell distance s1. The first shell distance s1 is measured in transverse direction 50. The first shell distance s1 is measured from the first end 15 of the first rib 13 to the second inner side 28 of the second housing wall 21. The first shell distance s1 is greater than 40% of the first maximum wall thickness mw1 of the first rib 13. This is also illustrated in FIG. 13.

[0087] The second rib 23 comprises in relation to the first housing shell 10 a second shell distance s2 (FIG. 16). The second shell distance s2 is measured in transverse direction 50. The second shell distance s2 is measured from the first end 25 of the second rib 23 to the first inner side 18 of the first housing wall 11. The second shell distance s2 is greater than 40% of the second maximum wall thickness mw2 of the second rib 23.

[0088] FIG. 17 shows a section through the housing 1 along the section plane XVII-XVII of FIG. 11. Accordingly, the second inner side 28 of the second housing shell 20 with its second ribs 23, 43, and 63 is visible. The first rib 13 projects into the second housing shell 20. The same holds true for the first ribs 33, 53, 54, and 55. These ribs are also illustrated in FIGS. 3 and 4.

[0089] FIG. 18 shows a detail of the section illustration of FIG. 17. The first rib 13 comprises at least a region 16 which is arranged in relation to the second outer wall 21 at a first distance d1 measured perpendicularly to the transverse direction 50 and perpendicularly to the second outer wall 21. The first distance d1 is measured in the separation plane 3. The first distance d1 amounts to at least five times, in particular at least ten times, the maximum first wall thickness mw1.

[0090] In an analogous manner, the second rib 23 comprises a region which is arranged in relation to the first outer wall 11 at a second distance measured perpendicularly to the transverse direction 50 and perpendicularly to the first outer wall 11. The second distance is measured in the separation plane 3. The second distance amounts to at least five times, in particular at least ten times the maximum second wall thickness mw2.

[0091] The first housing shell 10 comprises at least two first ribs 13, 33. The at least two first ribs 13 and 33, i.e., the first rib 13 and the first rib 33, comprise in transverse direction 50 a crossing point 4 (FIG. 18). In the crossing point 4, the first rib 13 and the first rib 33 are fixedly connected to each other. In the embodiment, the first rib 13 and the first rib 33 are monolithically configured in the crossing point 4. The at least two first ribs 13 and 33 each extend, beginning at the crossing point 4, perpendicularly to the transverse direction 50 to the first housing wall 11. The crossing point 4 comprises, viewed in transverse direction 50, a cross distance k1 to the first housing wall 11. The cross distance k1 is measured perpendicularly to the transverse direction 50 and perpendicularly to the first housing wall 11. The cross distance amounts to at least five times, in particular at least ten times, the first maximum wall thickness mw1 of the first rib 13.

[0092] The first rib 33, the first rib 54, and the first rib 55 form together a structure extending circumferentially closed about the transverse direction 50. The structure comprises three corner points where the first ribs 33, 54, and 55 are connected to each other. The structure encloses a cavity 34.

[0093] As illustrated in FIGS. 3 and 17, the first rib 13 comprises a first cutout 17. The first cutout 17 extends in transverse direction 50. The cutout 17 serves for receiving a second reinforcement rib 27 of the second housing shell 20. The reinforcement rib 27 is illustrated in FIGS. 18 and 4. In the assembled state of the housing 1, the second reinforcement rib 27 of the second housing shell 20 projects into the first cutout 17 of the first rib 13 of the first housing shell 10 so that the second reinforcement rib 27 crosses the cutout 17 of the first rib 13 in the direction perpendicular to the transverse direction 50. The second reinforcement rib 27 is arranged exclusively on one side of the separation plane 3. However, it can also be provided that the second reinforcement rib 27 is configured as a second rib and projects past the separation plane 3. It can also be provided that the reinforcement rib 27 comprises a cutout for receiving the first rib 13. The first rib 13 and the reinforcement rib 27 are then inserted into each other in a crossing manner.

[0094] In FIG. 19, the first ribs of the first housing shell 10 and the second ribs of the second housing shell 20 are marked with dashed lines. All first ribs and all second ribs comprise a total length G which is measured in the separation plane 3 and added up. When adding up, the first ribs and the second ribs are intersected by the separation plane 3 and the length of the first ribs and of the second ribs is measured and added up in the separation plane 3. The length of a rib is measured in this context always in the direction of the greatest extension, viewed from a point of the rib. In case of a curvy or angled extension of the rib in the separation plane 3, the length of the corresponding rib is determined by a path integral.

[0095] All first ribs and all second ribs are delimited by a virtual enveloping polygon P. By means of the polygon P, all immediately neighboring end points of first and second ribs in the separation plane 3 are connected to each other by straight lines.

[0096] The polygon P encloses a polygon surface P. The quotient of total length G and polygon surface P amounts to at least 0.2 mm.sup.−1.