JP6369486B2 - Structure manufacturing method and case thereof - Google Patents

Description

  The present invention relates to a method for manufacturing a case of a structure and the case.

  A case of a structure such as a transmission mounted on a vehicle is formed entirely using a metal material such as aluminum, but it is required to reduce the weight while ensuring a predetermined rigidity.

  On the other hand, a structure in which a part of a case of a metal structure is replaced with a resin and a metal frame member and a resin cover member are combined is known. For example, in Patent Document 1, a side cover that constitutes a part of a case of a transmission is configured by a metal frame member and a resin cover member that closes an opening formed between the frame members. Are disclosed.

JP 2013-117240 A

  As in the case disclosed in Patent Document 1, a frame member or the like for exclusively supporting the strength and rigidity of the frame member, a cover member for closing an opening surrounded by the bone part constituting the frame portion, and the like In the case of the wall portion, it is conceivable to reduce the thickness of the wall portion in order to further reduce the weight while ensuring the strength and rigidity.

  However, if the wall thickness is reduced, membrane vibrations with the skeleton as the node and the wall as the belly are likely to occur, and in particular the structure of a vehicle transmission or the like in which the case transmits vibrations from inside and outside. If it is a case, the membrane vibration becomes remarkable and causes noise.

  Then, an object of this invention is to provide the case of the structure which can suppress the membrane vibration of a wall surface part effectively, avoiding a weight increase, and its manufacturing method.

  In order to solve the above problems, the present invention is configured as follows.

First, the invention according to claim 1 of the present application is
A method for producing a case of a structure having a skeleton part that forms a skeleton and a wall surface part that closes an opening surrounded by the bone part constituting the skeleton part,
Having a modeling step of modeling the wall portion;
In the modeling step, a concave portion is formed on at least one surface so as to increase the rigidity of the wall surface portion ,
The bone part constituting the skeleton part has at least one hole extending in the longitudinal direction in the inside thereof .

The invention according to claim 2 is the manufacturing method according to claim 1,
In the modeling step, the concave portions are formed on both surfaces of the wall surface portion.

The invention according to claim 3 is the manufacturing method according to claim 2,
In the modeling step, the concave portions are formed on both surfaces of the wall portion so as not to overlap each other in plan view.

Moreover, invention of Claim 4 is a manufacturing method of any one of the said Claims 1-3, In the manufacturing method of Claim 1,
In the modeling step, a partition wall portion is formed in the recess so that the inside of the recess is divided into a plurality of regions in plan view.

The invention according to claim 5 is the manufacturing method according to any one of claims 1 to 4,
In the modeling step, a three-dimensional additive manufacturing method is used to model the wall surface portion integrally with the skeleton portion.

The invention according to claim 6 is the manufacturing method according to any one of claims 1 to 5 ,
In the modeling step, the plurality of concave portions having at least one basic shape of a circle, a triangle, a quadrangle, or another polygon in a plan view are formed so as to be regularly arranged.

The invention according to claim 7
A case of a structure having a skeleton part forming a skeleton and a wall part closing an opening surrounded by the bone part constituting the skeleton part,
The wall surface portion includes a recess on at least one surface thereof so as to increase the rigidity of the wall surface portion ,
The bone part constituting the skeleton part has at least one hole extending in the longitudinal direction in the inside thereof .

According to the invention described in claim 1 of the present application, since the modeling step of forming the recesses on at least one surface thereof is performed so as to increase the rigidity of the wall surface portion, the recesses obtained by the modeling step are included. The wall surface portion can be made lighter and have higher bending rigidity than a flat wall surface portion having no recess. Therefore, according to this invention, the manufacturing method of the case of the structure which can suppress the membrane vibration of a wall surface part effectively can be provided, avoiding a weight increase.
In addition, the bone part that constitutes the skeleton part has at least one hole extending in the longitudinal direction in the inside thereof, so that the weight of the bone part is reduced while maintaining the rigidity of the bone part compared to the bone part that does not have the hole part. Can be realized.

  Further, according to the invention of claim 2, since the concave portions are formed on both surfaces of the wall surface portion in the modeling step, the wall surface portion is lighter and more rigid than the case where the concave portion is formed only on one surface. It is possible to manufacture a case of a structure having

  According to the invention described in claim 3, in the modeling process, since the concave portions are formed on both surfaces of the wall surface portion so as not to overlap each other in plan view, a deep concave portion can be formed on the wall surface portion. Therefore, it is possible to manufacture a case of a structural body having a lighter and more rigid wall surface portion.

  According to the invention described in claim 4, in the modeling step, the partition wall portion is formed in the recess so that the recess is divided into a plurality of regions in plan view, and thus there is no partition wall portion. Rigidity can be greatly improved with a small increase in weight compared to the above.

  According to the invention of claim 5, since the wall surface portion is integrally formed with the skeleton portion using the three-dimensional additive manufacturing method, the wall surface portion and the skeleton portion are separately manufactured and then combined with each other. Compared to the above, it is possible to realize a manufacturing method in which parts management is easy and production efficiency is high. Furthermore, according to the three-dimensional additive manufacturing method, it is possible to freely mix portions having different thicknesses on the wall surface. On the other hand, in casting, although it is possible to partially form a build-up part as a rib etc. on the wall surface of the basic wall thickness, it is limited to setting different wall thickness due to the flow of hot water or die cutting. There is. In press molding, the wall thickness is basically limited to the thickness of the workpiece.

According to the invention described in claim 6 , the plurality of concave portions having at least one basic shape of a circle, a triangle, a quadrangle, or another polygon in plan view are formed so as to be regularly arranged. Therefore, the wall surface part which has various designs can be formed.

Further, according to the invention described in claim 7 , as in the invention described in claim 1, there is provided a structure case capable of effectively suppressing the membrane vibration of the wall surface portion while avoiding an increase in weight. can do.
In addition, the bone part that constitutes the skeleton part has at least one hole extending in the longitudinal direction in the inside thereof, so that the weight of the bone part is reduced while maintaining the rigidity of the bone part compared to the bone part that does not have the hole part. Can be realized.

It is a top view of the case of the structure concerning a 1st embodiment of the present invention. It is sectional drawing of the case of the structure along the YY line in FIG. It is the perspective view of the wall surface part of the case of the said structure, a top view, and sectional drawing. It is explanatory drawing regarding the effect | action of the said wall part. It is sectional drawing of the wall surface part of the case of the structure which concerns on 2nd Embodiment of this invention. It is a top view of the wall surface part of the case of the structure concerning a 3rd embodiment of the present invention. It is a perspective view of the wall surface part of the case of the structure which concerns on 4th Embodiment of this invention. It is a top view of the wall surface part of the case of the structure which concerns on 5th Embodiment of this invention. It is a top view of the wall surface part of the case of the structure which concerns on 6th thru | or 8th embodiment of this invention. It is a top view of the wall surface part of the case of the structure which concerns on 9th thru | or 11th embodiment of this invention. It is a top view of the wall surface part of the case of the structure which concerns on 12th thru | or 14th embodiment of this invention. It is a top view of the wall surface part of the case of the structure which concerns on 15th thru | or 17th embodiment of this invention. It is the perspective view and sectional drawing of the wall surface part of the case of the structure which concern on 18th Embodiment of this invention. It is the perspective view and sectional drawing of the wall surface part of the case of the structure which concern on 19th Embodiment of this invention. It is the perspective view and sectional drawing of the wall surface part of the case of the structure which concern on 20th Embodiment of this invention. It is the perspective view and sectional drawing of the wall surface part of the case of the structure which concern on 21st Embodiment of this invention. It is the perspective view and sectional drawing of the wall surface part of the case of the structure which concern on 22nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[First Embodiment]
FIG. 1 is a top view of the case of the structure according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the case of the structural body taken along line YY in FIG.

[Structure of structure case]
As shown in FIG. 1, the case 1 of the structure according to the first embodiment of the present invention is a transmission that constitutes a power transmission device mounted on a vehicle, specifically, an input shaft and an output shaft are in the same axis This is a case of a vertical-type manual transmission mounted on a front engine / rear drive vehicle arranged in the vehicle.

  The case 1 is provided with a speed change mechanism arranged such that its axis extends in the longitudinal direction of the vehicle body. The speed change mechanism is connected to a drive source such as an engine disposed on the vehicle body front side of the case 1 via a clutch. An input shaft S1 to be connected (see FIG. 2), an output shaft (not shown) arranged on the same axis as the input shaft S1, and a counter shaft S2 arranged in parallel to the input shaft S1 and the output shaft ( The input shaft S1, the output shaft, and the counter shaft S2 are rotatably supported on the case 1.

  The case 1 includes a clutch housing 2 that houses a clutch, a transmission case 3 that houses the transmission mechanism coupled to the clutch housing 2, and an extension housing 4 that is coupled to the transmission case 3 on the rear side of the vehicle body. It has as a case component. The case 1 includes a flange portion 2 a provided on the vehicle body rear side of the clutch housing 2, a flange portion 3 a provided on the vehicle body front side of the transmission case 3, and a flange provided on the vehicle body rear side of the transmission case 3. The flange portion 4a provided on the vehicle body front side of the portion 3b and the extension housing 4 is formed by fastening and fixing using bolts and nuts.

  These case constituent members 2, 3, and 4 have a skeleton portion 10 that forms the skeleton of the case 1, and a wall surface portion 20 that is provided so as to close an opening surrounded by the skeleton portion 10.

  The skeleton part 10 includes a plurality of first skeleton parts 11 extending in the longitudinal direction of the vehicle body, which is the axial direction of the case 1, and a plurality of second skeleton parts 12 extending in the circumferential direction of the case 1 in a direction orthogonal to the axial direction of the case 1. And have.

  As shown in FIG. 2, a plurality of first skeleton parts 11 are provided spaced apart in the circumferential direction of the case 1 in a cross section in a direction orthogonal to the axial direction of the case 1, and are formed in a substantially quadrangular cross section. . The first skeleton part 11 has a hollow structure having a hole 13 having a substantially square cross section extending in the longitudinal direction of the first skeleton part 11 at the center of the cross section.

  A plurality of second skeleton parts 12 are provided apart from each other in the axial direction of the case 1 and have a substantially circular cross section. Similarly to the first skeleton part 11, the second skeleton part 12 has a hollow structure having a hole 14 having a substantially circular cross section extending in the longitudinal direction of the second skeleton part 12 at the center of the cross section.

  The first skeleton part 11 and the second skeleton part 12 are, for example, a porous layer in which a plurality of pores communicating with each other are dispersed inside a skin layer forming a peripheral surface, for example, a structure in which a plurality of pores extend in the longitudinal direction. Alternatively, a structure in which a three-dimensional lattice is formed, a solid structure, or the like may be used.

  On the other hand, the wall surface part 20 of the case 1 is provided so as to close the opening part surrounded by the skeleton part 10, specifically, the first skeleton part 11 and the second skeleton part 12, and as shown in FIG. It is formed in a flat plate shape that is thinner than 10.

  Next, the structure of the wall surface 20 which is a feature of the present invention will be described in detail with reference to FIG. 3 (a), 3 (b), and 3 (c) are a perspective view, a plan view, and a cross-sectional view taken along line XX of the plan view, respectively. Only one wall surface 20 surrounded is illustrated.

  As shown in FIG. 3A, the wall surface portion 20 has a structure in which a plurality of concave portions 21 and 22 are formed on both surfaces of a flat plate-like member. The plurality of recesses 21 and 22 provided on each surface are regularly arranged in an equal pitch lattice pattern alternately so as not to overlap each other in plan view.

As shown in FIG. 3B, each of the recesses 21 and 22 has a rectangular basic shape in plan view. Each of the recesses 21 and 22 has partition wall portions 23 and 24 formed therein for reinforcement. In the present embodiment, the partition wall portions 23 and 24 have a cross-shaped shape, and the partition wall portions 23 and 24 have four regions 21 ₁ , 21 ₂ , 21 ₃ , respectively, in plan view. 21 ₄ , 23 ₁ , 23 ₂ , 23 ₃ , and 23 ₄ are divided in a lattice pattern. In addition, you may divide the inside of each recessed part 21 and 22 into another number of area | region by planar view by the partition wall parts 23 and 24. FIG.

  As shown in FIG.3 (c), each recessed part 21 and 22 is a rectangular recessed part which has a flat bottom face, and it is formed so that the depth to the bottom face may become common. In the case of the present embodiment, the heights of the partition wall portions 23 and 24 provided inside the recesses 21 and 22 are constant, and the thickness of the partition walls 23 separates the recesses 21 and 22 adjacent to each other. It is formed thicker.

  The shape, size and depth of the recesses 21 and 22 and the arrangement, height and thickness of the partition wall portions 23 and 24 can be appropriately set according to required bending rigidity, weight, and the like.

[Method for manufacturing case of structure]
The structure case 1 configured as described above is manufactured by the following manufacturing method.

  First, for example, using a 3D printer using a metal powder such as aluminum as a raw material, a modeling process is performed in which the skeleton part 10 and the wall surface part 20 of the case constituent members 2, 3, and 4 are integrally layered by a three-dimensional additive manufacturing method. .

  In this modeling process, when the skeleton part 10 of the case constituent members 2, 3, 4 is formed by the three-dimensional layered modeling method, the holes 13, 14 formed inside the skeleton part 10 are provided in a removal process described later. In order to remove the metal powder remaining in the holes 13 and 14, a plurality of discharge holes (not shown) communicating with the surfaces of the case constituent members 2, 3 and 4, preferably the inner peripheral surface are formed.

  Here, as the three-dimensional additive manufacturing method, for example, based on CAD data, a powder sintering additive manufacturing method is used in which a material powder is sintered and formed one by one using a laser or an electron beam. obtain. Specifically, a powder layer in which a powder of metal or the like is spread thinly is melted and solidified by selectively irradiating with a laser or an electron beam, and a new powder layer is laminated thereon and laser irradiation is repeated. Powder Bed Fusion, which performs additive manufacturing, and Direct Energy Deposition (DMP), which melts by laser or electron beam while supplying powder and deposits the melt. ) Can be used. According to such a method, it is possible to integrally model a product having a complicated internal structure such as a hollow structure that cannot be manufactured by molding using a mold. Note that the three-dimensional additive manufacturing method is not limited to the above-described method.

  Next, a removal process is performed in which the metal powder remaining without being melted and solidified in the holes 13 and 14 formed in the skeleton 10 is removed from the discharge holes of the skeleton 10 to the outside of the holes 13 and 14.

  Specifically, this removal is performed by sending compressed air from one of the plurality of discharge holes communicating with the holes 13 and 14 to the holes 13 and 14 and blowing out the metal powder remaining together with the air from the other discharge holes. Then, vibration is applied to the case 1 after the layered modeling, and the metal powder remaining from the discharge hole is shaken off.

  In addition, the finishing process which performs a cutting etc. in the required location of the case structural members 2, 3, and 4 may be implemented after a removal process.

  Finally, the assembly process of assembling each other is performed by fastening and fixing the case components 2, 3, and 4 using bolts and nuts.

  By the above manufacturing method, the structure case 1 configured as described above is manufactured.

  As mentioned above, according to this embodiment, there exist the following effects.

  According to this embodiment, the modeling process which forms the recessed part 21 in the at least one surface is performed so that the rigidity of the wall surface part 20 may be improved. Therefore, in the case of the conventional flat wall surface portion 20 ′, as shown in FIG. 4A, since the bending rigidity is low, it is easy to bend, and the surrounding skeleton portion (not shown) is caused by vibration of the engine or the like. There is a risk of membrane vibration having a node and a wall surface 20 ′ as an abdomen, but in the case of the wall surface portion 20 of the present embodiment, as shown in FIG. In addition, membrane vibration hardly occurs on the wall surface portion 20. Therefore, according to the present embodiment, it is possible to provide a manufacturing method of a case of a structure that can effectively suppress membrane vibration of the wall surface portion 20 while avoiding an increase in weight.

  Moreover, according to this embodiment, since the recessed parts 21 and 23 are formed in both surfaces of the wall surface part 20 in a modeling process, compared with the case where the recessed part 21 is formed only in one surface, it is a lighter and highly rigid wall surface. A case of a structure having the portion 20 can be manufactured.

  Moreover, according to this embodiment, since the recessed parts 21 and 23 are formed on both surfaces of the wall surface part 20 so as not to overlap each other in plan view, the deep recessed parts 21 and 23 can be formed on the wall surface part 20 in the modeling process. it can. Therefore, it is possible to manufacture a case of a structure having a wall surface portion 20 that is lighter and more rigid.

  Further, according to the present embodiment, in the modeling step, the partition wall portions 22 and 24 are formed in the recess 21 so that the interior of the recess 21 is divided into a plurality of regions in plan view. Rigidity can be significantly improved with a small increase in weight compared to those not having the.

  Moreover, according to this embodiment, since the wall surface part 20 is modeled integrally with the skeleton part 10 using the three-dimensional additive manufacturing method, the wall part 20 and the skeleton part 10 are manufactured separately and then combined with each other. Compared to the above, it is possible to realize a manufacturing method in which parts management is easy and production efficiency is high. Furthermore, according to the three-dimensional additive manufacturing method, it is possible to freely mix portions having different thicknesses on the wall surface portion 20. On the other hand, in casting, although it is possible to partially form a build-up part as a rib etc. on the wall surface of the basic wall thickness, it is limited to setting different wall thickness due to the flow of hot water or die cutting. There is. In press molding, the wall thickness is basically limited to the thickness of the workpiece.

  Further, according to the present embodiment, the first skeleton part 11 and the second skeleton part 12 constituting the skeleton part 10 have at least one hole part 13 extending in the longitudinal direction therein, and therefore the hole part 13 Compared to the first skeleton part 11 and the second skeleton part 12 that do not have, the weight can be reduced while maintaining the rigidity of the first skeleton part 11 and the second skeleton part 12.

  Further, according to the present embodiment, the plurality of concave portions 21 and 23 having at least one basic shape of a circle, a triangle, a quadrangle, or another polygon in plan view are formed so as to be regularly arranged. The wall portion 20 having various designs can be formed.

[Other Embodiments]
The specific shape and arrangement of the recesses provided in the wall surface are not limited to the above-described first embodiment. Below, the structure of the wall surface part in the case of the structure which concerns on other embodiment is demonstrated concretely, referring FIGS. 5-17 is a figure which shows the wall surface part which obstruct | occludes one of the opening parts enclosed by the bone part which comprises the frame | skeleton part 10 which is not shown in figure. Moreover, in the following description, description is abbreviate | omitted about the structure which is common in the above-mentioned 1st Embodiment.

  As shown in FIG. 5, the wall surface portion 120 in the case of the structure according to the second embodiment is only provided in one surface so that the plurality of concave portions 121 increase the rigidity of the wall surface portion 120. Different from the first embodiment. Similarly to the first embodiment, a lattice-shaped partition wall 122 is formed in each recess 121 so that the recess 121 is divided into a plurality of regions in plan view. According to this, by arranging the plurality of concave portions 121 regularly in an equal pitch lattice pattern on the entire surface, the membrane vibration of the wall surface portion 20 is effectively prevented while avoiding an increase in weight as in the first embodiment. Can be suppressed. Since the case of the structure according to the second embodiment can form one surface of the wall surface portion 120 flat, it is effective when it is desirable that the surface of the case has less irregularities.

  Moreover, as shown in FIG. 6, the wall surface part 220 in the case of the structure according to the third embodiment is disposed obliquely with respect to a skeleton part (not shown) surrounding the plurality of concave parts 221 and 223. It differs from 1st Embodiment only by a point.

  Moreover, as shown in FIG. 7, the wall surface part 320 in the case of the structure according to the fourth embodiment is different from the first embodiment only in that no partition wall part is provided inside each of the recesses 321 and 322. .

  As shown in FIG. 8, the wall surface 420 in the case of the structure according to the fifth embodiment is along the diagonal lines of the recesses 421 and 422 in which the partition wall portions 423 and 424 have a rectangular basic shape in plan view. It differs from 1st Embodiment only by the point provided.

  Next, another embodiment in which the basic shape of the concave portion in plan view is different from that of the first embodiment will be described with reference to FIGS.

  FIG. 9 is a plan view of the wall surface of the case of the structure according to the sixth to eighth embodiments of the present invention, and relates to a structure provided with a plurality of concave portions having a circular basic shape in plan view.

  As shown to Fig.9 (a), the wall surface part 520 in the case of the structure which concerns on 6th Embodiment has the basic shape circular shaped by the recessed parts 521 and 523, and was provided in each surface. The plurality of recesses 521 and 523 are regularly arranged in an equal pitch staggered pattern so as not to overlap each other in plan view, and partition walls are provided inside the recesses 521 and 523. It is not done.

  Further, as shown in FIG. 9B, the wall surface portion 620 in the case of the structure according to the seventh embodiment has a cruciform shape parallel to the surrounding bone portion (not shown) inside the recesses 621 and 623. Partition walls 622 and 624 are provided.

  Moreover, as shown in FIG.9 (c), the wall surface part 720 in the case of the structure which concerns on 8th Embodiment is diagonally with respect to the surrounding bone | frame part (not shown) inside each recessed part 721,723. X-shaped partition wall portions 722 and 724 extending in the direction are provided.

  FIG. 10 is a plan view of the wall surface portion of the case of the structure according to the ninth to eleventh embodiments of the present invention, and relates to a structure including a plurality of concave portions having a regular triangular basic shape in plan view.

  As shown in FIG. 10A, the wall surface portion 820 in the case of the structure according to the ninth embodiment has concave portions 821 and 823 having a regular triangular basic shape in plan view, and is provided on each surface. The plurality of recesses 821 and 823 are regularly arranged in a regular pitch staggered pattern alternately so as not to overlap each other in plan view.

  As shown in FIG. 10 (b), the wall surface portion 920 in the case of the structure according to the tenth embodiment has a surrounding bone portion inside each of the recesses 921 and 923 having a regular triangular basic shape in plan view. Straight partition walls 922 and 924 are provided in parallel with (not shown).

  Further, as shown in FIG. 10C, the wall surface portion 1020 in the case of the structure according to the eleventh embodiment has a radial partition wall inside the concave portions 1021 and 1023 having a regular triangular basic shape in plan view. Portions 1022 and 1024 are provided.

  FIG. 11: is a top view of the wall surface part of the case of the structure which concerns on 12th thru | or 14th embodiment of this invention, Comprising: It is related with what provided the several recessed part which has a regular hexagonal basic shape by planar view.

  As shown in FIG. 11 (a), the wall surface portion 1120 in the case of the structure according to the twelfth embodiment has concave portions 1121, 1123 having a regular hexagonal basic shape in plan view, and is provided on each surface. The plurality of recesses 1121 and 1123 are regularly arranged in a tortoiseshell pattern so as not to overlap each other in plan view.

  Further, as shown in FIG. 11B, the wall surface portion 1220 in the case of the structure according to the thirteenth embodiment is disposed in the concave portions 1221 and 1223 having a regular hexagonal basic shape in plan view, in plan view. Radial partition wall portions 1222 and 1224 extending in a direction perpendicular to the sides of the regular hexagon are provided.

  Moreover, as shown in FIG.11 (c), the wall surface part 1320 in the case of the structure which concerns on 14th Embodiment is planarly arranged inside each recessed part 1321, 1323 which has a regular hexagonal basic shape by planar view. Radial partition walls 1322 and 1324 extending along a regular hexagonal diagonal are provided.

  FIG. 12 is a plan view of the wall surface of the case of the structure according to the fifteenth to seventeenth embodiments of the present invention, and relates to a structure including a plurality of concave portions having different polygonal basic shapes in plan view.

  As shown in FIG. 12 (a), the wall surface portion 1420 in the case of the structure according to the fifteenth embodiment is provided with concave portions 1421a and 1421b having a square and triangular basic shape in plan view on one surface, and the other side. Similarly, recesses 1423a and 1423b having a quadrangular and triangular basic shape in a plan view are also provided on this surface. In addition, a plurality of concave portions 1421a and 1423a whose basic shape is a quadrangle are alternately arranged so that they do not overlap each other in plan view, and a plurality of concave portions 1421b and 1423b whose basic shape is a triangle shape in plan view. The second columns arranged alternately so as not to overlap each other are alternately arranged.

  Also, as shown in FIG. 12B, the wall surface portion 1520 in the case of the structure according to the sixteenth embodiment is provided with recesses 1521a and 1521b having a square and triangular basic shape in plan view on one surface. The other surface is provided with recesses 1523a and 1523b having a square and triangular basic shape in plan view. And the recessed parts 1521a and 1523a whose basic shape is a rectangle and the recessed parts 1521b and 1523b whose basic shape surrounding the four sides of each of the recessed parts 1521a and 1523a are triangular are arranged so as not to overlap each other in plan view.

  As shown in FIG. 12C, the wall surface portion 1620 in the case of the structure according to the seventeenth embodiment is provided with concave portions 1621a and 1621b having hexagonal and triangular basic shapes in plan view on one surface. The other surface is provided with a recess 1623 having a rectangular basic shape in plan view. Then, six concave portions 1623 whose basic shape is a square and six concave portions 1621b whose basic shape is a triangle are alternately arranged so as to surround each concave portion 1621a whose basic shape is a hexagon. .

  Note that the plurality of recesses formed in each wall portion is not limited to the above-described combination, and a recess having a basic shape of a circle, a triangle, a quadrangle, or another polygon in a plan view is required for bending rigidity and You may form it combining suitably according to a weight etc.

  Next, another embodiment in which the shape of the back side of the recess is different from that of the first embodiment will be described with reference to FIGS.

  FIG. 13: is the perspective view and sectional drawing of the wall surface part 1720 of the case of the structure which concern on 18th Embodiment of this invention. As shown in FIG. 13A, the wall surface portion 1720 has substantially hemispherical concave portions 1721 and 1723 formed on both surfaces thereof, and substantially hemispherical convex portions 1722, on the back side of the concave portions 1721 and 1723. 1724 are formed. As shown in FIG. 13B, a plane-symmetric dome-shaped wall portion is configured by the combination of the concave portion 1721 and the convex portion 1722, and the concave portion 1723 and the convex portion 1724. The plurality of plane-symmetric dome-shaped wall portions are alternately arranged in an equal pitch lattice pattern so as not to overlap each other in a plan view.

  Moreover, FIG. 14 is the perspective view and sectional drawing of the wall surface part 1820 of the case of the structure which concerns on 19th Embodiment of this invention. As shown in FIG. 14A, the wall surface portion 1820 has substantially hemispherical concave portions 1821 and 1823 formed on both surfaces thereof, and substantially hemispherical convex portions 1822 and 1823 on the back side of the respective concave portions 1821 and 1823. 1824 are respectively formed. As shown in FIG. 14B, the wall surface portion 1820 has a smaller aspect ratio of the plurality of concave portions 1821 and 1823 than the case of the eighteenth embodiment, and accordingly, the height of the convex portions 1822 and 1824 is increased. Is formed low.

  FIG. 15 is a perspective view and a sectional view of the wall surface portion 1920 of the case of the structure according to the twentieth embodiment of the present invention. As shown in FIG. 15A, the wall surface portion 1920 has substantially hemispherical concave portions 1921 and 1923 formed on both sides thereof, and substantially hemispherical convex portions 1922, 1924 are formed. As shown in FIG. 15 (b), the wall surface part 1920 includes a dome-shaped wall part that is plane-symmetrical by a combination of a concave part 1921 and a convex part 1922, and a concave part 1923 and a convex part 1924. The plurality of plane-symmetric dome-shaped wall portions are alternately arranged at the positions of the six apexes of each regular hexagon forming the turtle shell pattern so as not to overlap each other in plan view.

  Moreover, FIG. 16 is the perspective view and sectional drawing of the wall surface part 2020 of the case of the structure which concerns on 21st Embodiment of this invention. As shown in FIG. 16A, the wall surface portion 2020 has concave portions 2021 and 2023 formed on both surfaces thereof, and convex portions 2022 and 2024 are formed on the back side of the concave portions 2021 and 2023, respectively. As shown in FIG. 16 (b), the wall surface portion 2020 includes a dome-shaped wall portion that swells in opposite directions by a combination of a plurality of concave portions 2021 and 2023 and a plurality of convex portions 2022 and 2024. The plurality of dome-shaped wall portions that swell in opposite directions are alternately arranged so that the cross-sections thereof have round and substantially serrated waveforms at the top and bottom portions so as not to overlap each other in plan view.

  Moreover, FIG. 17 is the perspective view and sectional drawing of the wall surface part 2120 of the case of the structure which concerns on 22nd Embodiment of this invention. As shown in FIG. 17A, the wall surface portion 2120 has concave portions 2121 and 2123 formed on both surfaces thereof, and convex portions 2122 and 2124 are formed on the back side of the concave portions 2121 and 2123, respectively. As shown in FIG. 17B, the wall surface portion 2120 includes a dome-shaped wall portion that swells in the opposite direction by a combination of a plurality of concave portions 2121, 2123 and a plurality of convex portions 2122, 2124. The plurality of dome-shaped wall portions that swell in opposite directions are alternately arranged so that the cross-section thereof has a flat, substantially serrated waveform at each top and each bottom so as not to overlap each other in plan view.

  The present invention is not limited to the illustrated embodiments, and various improvements and design changes can be made without departing from the spirit of the present invention.

  For example, in the present embodiment, the plurality of recesses provided in each wall surface portion have the same depth, but the present invention is not limited to this. For example, the wall surface portion is provided in the outer peripheral portion close to the skeleton portion. The concave portion is shallow, and the concave portion provided in the central portion away from the skeleton portion is formed deep, or vice versa, or the depth of the concave portion is randomly formed. It may be different depending on where you are.

  Further, in this embodiment, the size of the basic shape of each recess is the same, but is not limited to this, for example, the recess provided in the outer peripheral portion near the skeleton portion in the wall surface portion is large and separated from the skeleton portion. The size of the basic shape of each recess depends on the location where the recess is provided, such as forming the recess in the central portion small, or vice versa, or forming the size of the recess randomly. May be different.

  Further, in this embodiment, the width of the partition wall portion provided in each recess is common, but is not limited to this, for example, provided in the recess provided in the outer peripheral portion near the skeleton portion in the wall surface portion. The width of the partition wall portion formed is wide, and the width of the partition wall portion provided in the recess portion provided in the center portion away from the skeleton portion is formed narrowly, or vice versa, or the partition provided in the recess portion The width of the partition wall provided in each recess may be different depending on the location where the recess is provided, such as randomly forming the width of the wall.

  Further, in the present embodiment, a plurality of recesses are regularly arranged in each wall portion, but the present invention is not limited to this. For example, only one recess is provided, or the plurality of recesses are irregular. It may be arranged.

  Further, in the present embodiment, the wall surface portion is provided with a concave portion on the surface, but the wall surface portion has a substantially flat shape as a whole, but is not limited thereto. It may be bent into a shape.

  In the present embodiment, the shape and arrangement of the recesses are the same for all the wall surface parts constituting the case, but the present invention is not limited to this, and the recesses provided on the wall surface parts depending on the location of the wall surface parts. The shape and arrangement may be different.

  In the present embodiment, the case skeleton and the wall surface are integrally formed by the three-dimensional additive manufacturing method. However, the present invention is not limited to this. For example, only the case skeleton is three-dimensional additive manufacturing method. The case is formed by injection molding using a resin material such as a thermoplastic resin or die casting using a metal material such as aluminum by inserting the skeleton portion formed thereafter into a predetermined position of the mold and molding the case. It is also possible to integrally form the skeleton part and the wall surface part.

  Furthermore, in this embodiment, the skeleton portion has a plurality of first skeleton portions extending in the axial direction of the case and a plurality of second skeleton portions extending in the circumferential direction of the case, but is not limited thereto. For example, in order to reduce the weight while ensuring the rigidity of the case, the topology optimization method is applied to the case of the structural body with a predetermined bending rigidity and rigidity such as torsional rigidity as constraints. It is also possible to analyze the optimum shape of the case by sequentially removing the portions that do not contribute to the improvement, and to use the analyzed optimum shape of the case as the skeleton portion.

  As described above, according to the present invention, it is possible to effectively suppress the membrane vibration of the wall surface portion while avoiding an increase in weight, so that a structure such as a manual transmission or an automatic transmission mounted on a vehicle is provided. There is a possibility of being suitably used in the vehicle manufacturing industry, such as in the case of manufacturing a body case.

1 Case 10 Skeletal part 11 First skeletal part (bone part)
12 Second skeleton (bone)
13, 14 Hole 20, 120 ... 2120 Wall 21, 21, ... 2121, 23, 123 ... 2123 Recess 22, 222, 422, 622, 722, 922, 1022, 1222, 1322, 24 224, 424, 624, 724, 924, 1024, 1224, 1324

Claims (7)

A method for producing a case of a structure having a skeleton part that forms a skeleton and a wall surface part that closes an opening surrounded by the bone part constituting the skeleton part,
Having a modeling step of modeling the wall portion;
In the modeling step, a concave portion is formed on at least one surface so as to increase the rigidity of the wall surface portion ,
The method for manufacturing a case of a structure, wherein the bone part constituting the skeleton part has at least one hole extending in the longitudinal direction therein. The method of manufacturing a structure case according to claim 1, wherein in the modeling step, the concave portions are formed on both surfaces of the wall surface portion. 3. The method of manufacturing a structure case according to claim 2, wherein, in the modeling step, the concave portions are formed on both surfaces of the wall surface portion so as not to overlap each other in plan view. The structure according to any one of claims 1 to 3, wherein in the modeling step, a partition wall portion is formed in the recess so that the inside of the recess is divided into a plurality of regions in a plan view. Manufacturing method for body case. 5. The manufacturing of a case of a structure according to claim 1, wherein in the modeling step, the wall surface part is modeled integrally with the skeleton part using a three-dimensional additive manufacturing method. Method. In the modeling step, the plurality of concave portions having at least one basic shape of a circular shape, a triangular shape, a quadrangular shape, or another polygonal shape in a plan view are formed so as to be regularly arranged. A method for manufacturing a case of the structure according to any one of 1 to 5 . A case of a structure having a skeleton part forming a skeleton and a wall part closing an opening surrounded by the bone part constituting the skeleton part,
The wall surface portion includes a recess on at least one surface thereof so as to increase the rigidity of the wall surface portion ,
A case of a structural body, wherein a bone part constituting the skeleton part has at least one hole extending in a longitudinal direction thereof .