JP5268781B2 - Axle case - Google Patents

Description

  The present invention relates to an axle case of a sheet metal welding assembly structure in which an upper side plate having a groove-shaped cross section with a lower open side and a lower side plate with an open upper side facing each other are welded face to face.

  As shown in FIG. 1, an axle case 1J having a sheet metal welding assembly structure generally has an upper bulging portion 2J that has a groove-shaped cross-sectional shape that is open at the bottom and bulges upward in the center in the vehicle width direction. The side plate 3J is welded face-to-face with a lower side plate 5J having a groove-shaped cross-sectional shape with an open top and a lower bulging portion 4J bulging downward at the vehicle width direction central portion. A ring-shaped reinforcing member 6 for attaching a gear case (for differential gear) is welded to the portion, and a substantially hemispherical cover 7 for sealing gear lubricating oil or the like is welded to the rear central opening. , Schematically configured (FIG. 1 of Patent Document 1).

  As shown in FIG. 5 (a), the upper side plate 3J and the lower side plate 5J of the axle case 1J are blanked by punching a rectangular material plate 8J and removing excess portions (chips) 9J indicated by hatching. The blank product 10J is formed by bending or the like at the portion indicated by the alternate long and short dash line by pressing. The edge of the blank 10J in FIG. 5A on the right side (inward in the vehicle width direction) from the top 11J of the mountain is the central opening of the axle case 1J, and to the left (outward in the vehicle width direction) of the mountain top 11J. ) Is the welded portion 12J between the upper side plate 3J and the lower side plate 5J, and the crest portion 11J is the weld end in the vehicle width direction of the welded portion 12J.

  As shown in FIG. 1, the upper bulging portion 2J of the upper side plate 3J extends downward from the web 13J having a central portion in the vehicle width direction bulged upward and the front and rear ends of the web 13J. The lower bulging portion 4J of the lower side plate 5J is formed into a groove-shaped cross section with the lower portion opened by the flange 14J. The web 15J has a central portion in the vehicle width direction bulged downward, and the front end and the rear of the web 15J. It is formed in a groove-shaped cross section that is open upward by flanges 16J extending upward from the ends.

  In the upper side plate 3J and the lower side plate 5J of the conventional axle case 1J, the widths of the webs 13J and 15J in the upper bulge portion 2J and the lower bulge portion 4J are substantially constant along the vehicle width direction. That is, as shown to Fig.5 (a), a pair of dashed-dotted line which is a fold line of the blank 10J was substantially parallel (substantially straight line).

JP 2009-1252 A JP 2007-62538 A

  Incidentally, the distance A from the one-dot chain line of the blank 10J shown in FIG. 5A to the top 11J of the mountain is determined by the dimensions of the product (axle case). For this reason, if a pair of dashed-dotted lines are substantially parallel, the space | interval of the peak parts 11J of the blank goods 10J will become the length which added the space | interval B of dashed-dotted lines to what doubled the said distance A, and material The width of the plate 8J is determined by its length. As a result, in the conventional axle case 1J, when the blank plate 10J is punched out to obtain the blank product 10J, the shavings 9J indicated by hatching are larger than those of the present invention product shown in FIG. Yield decreases. This has been a major obstacle in reducing the material cost and, in turn, the manufacturing cost of the axle case 1J.

  In order to prevent a decrease in yield, as shown in FIG. 3 of Patent Document 2, there is known an axle case having a structure in which two triangular plates are added to both sides of the central opening portion at the front and rear of the axle case. Yes. According to the axle case of this structure, since the blank product of the upper side plate and the lower side plate becomes a substantially rectangular plate, it is possible to suppress the yield reduction of the material. However, in such a structure, since the number of parts increases, an increase in parts processing costs and an increase in assembly processing costs are unavoidable, and in addition, a decrease in durability strength accompanying welding of the triangular plate can be a problem. .

  Accordingly, an object of the present invention is to provide an axle case of a sheet metal welded assembly structure that can improve the material yield without increasing the number of parts, promote cost reduction and weight reduction, and suppress a decrease in strength. It is in.

  In order to achieve the above object, the present invention has an upper side plate that is formed in a groove-shaped cross section that is open downward along the vehicle width direction and has an upper bulging portion at the center in the vehicle width direction, along the vehicle width direction. And a lower side plate having a lower bulging portion at the center in the vehicle width direction, and an axle of a sheet metal welding assembly structure in which the upper side plate and the lower side plate are welded to face each other. The upper bulging portion has a web bulged upward in the vehicle width direction central portion, and the lower bulging portion has a web bulged downward in the vehicle width direction central portion. And at least one of the upper bulging portion and the lower bulging portion has a web width at the beginning of the bulging and an apex of the bulging at a portion between the bulging start and the bulging apex along the vehicle width direction of the web. Having a constricted web formed narrower than the width of the web A.

  Further, even if the cross section obtained by obliquely cutting the constricted web portions of the upper bulging portion and the lower bulging portion from the inside to the outside of each bulging portion with respect to the axle is a trapezoid whose lower side is open Good.

  Moreover, the cross-section which cut | disconnected the part of the constriction web of the said upper bulging part and the lower bulging part perpendicularly | vertically perpendicularly to the axle may be a U-shape with the lower part opened.

  According to the axle case according to the present invention, the yield of the material can be improved without increasing the number of parts, and the decrease in strength can be suppressed while promoting cost reduction and weight reduction.

It is a disassembled perspective view of the axle case which shows a prior art example. It is a disassembled perspective view of the axle case which concerns on one Embodiment of this invention. (A) is the IIIa-IIIa sectional view taken on the line of FIG. 2, (b) is the IIIb-IIIb sectional view of FIG. 2, (c) is the IIIc-IIIc sectional view of FIG. It is the IV-IV sectional view taken on the line of FIG. (A) is a development view of a conventional axle case side plate (upper or lower side plate), and (b) is a development view of an axle case side plate according to an embodiment of the present invention. It is a disassembled perspective view of the axle case which concerns on another embodiment of this invention. (A) is the sectional view on the VIIa-VIIa line of FIG. 6, (b) is the sectional view on the VIIb-VIIb line of FIG. 6, (c) is the sectional view on the VIIc-VIIc line of FIG. It is the VIII-VIII sectional view taken on the line of FIG. It is a disassembled perspective view of the axle case (thing using a triangular plate) which concerns on another embodiment of this invention. (A) is a development view of a conventional axle case side plate (using a triangular plate), and (b) is a development view of an axle case side plate (using a triangular plate) according to an embodiment of the present invention.

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

  As shown in FIG. 2, the axle case 1 according to the present embodiment has a sheet metal welded assembly structure, and is formed in a groove-shaped cross section that is open downward along the vehicle width direction, and has an upper swelling at the center in the vehicle width direction. An upper side plate 3 having a protruding portion 2 and a lower side plate 5 having a groove-shaped cross section open upward along the vehicle width direction and having a lower bulging portion 4 at the center in the vehicle width direction. 3 and the lower side plate 5 are welded face to face (butt welding), and a ring-shaped reinforcing member 6 for attaching a gear case (for differential gear) is welded to the front central opening, and the rear central opening Further, a substantially hemispherical cover 7 for sealing the gear lubricating oil or the like is welded to form a schematic structure.

  At the lower end of the upper side plate 3 and the upper end of the lower side plate 5, a welded portion 12 for welding the upper side plate 3 and the lower side plate 5 is formed along the vehicle width direction. The inner end becomes the vehicle width direction inner weld end 11, and the vehicle width direction outer end becomes the vehicle width direction outer weld end 17.

  The upper bulging portion 2 of the upper side plate 3 is arranged along the vehicle width direction and extends downward from the front end and the rear end of the web 13 in which the center portion in the vehicle width direction bulges upward. And a flange 14. Similarly, the lower bulging part 4 of the lower side plate 5 is arranged along the vehicle width direction and the web 15 whose center part in the vehicle width direction is bulged downward, and upward from the front end and the rear end of the web 15 respectively. And an extended flange 16.

  The feature of this embodiment is that the upper bulging portion 2 and the lower bulging portion 4 are webs at which the webs 13 and 15 begin to bulge in a portion between the bulging beginning and the apex of the bulging. 13 and 15 and a narrow web 18 formed narrower than the width of the web 13 and 15 at the top of the bulge. The constricted web 18 may be provided only in one of the upper bulging portion 2 and the lower bulging portion 4 instead of both.

  The section of this constricted web 18 cut obliquely from the inside of each of the bulging portions 2 and 4 to the outside with respect to the axle has a trapezoidal shape with the bottom open.

  That is, as shown in FIG. 3A, the upper bulging portion 2 (the same as the lower bulging portion 4) has an oblique cut surface passing through the constricted web 18 portion and the vehicle width direction inner side weld end 11 downward. 3 is an open trapezoidal shape, and as shown in FIG. 3B, the cut surface passing through the apex-side portion of the constricted web 18 and the weld end 11 in the vehicle width direction is open at the bottom. As shown in FIG. 3 (c), the cut surface passing through the portion on the start side of the squeezing web 18 and the inner weld end 11 in the vehicle width direction has a U shape with the lower part opened. And as shown in FIG. 4, the V-shaped valley 19 is formed in the flange 14 of the upper bulging part 2 (the flange 16 of the lower bulging part 4 is also the same) on both sides of the central opening. Has been.

  As shown in FIG. 5B, the upper and lower side plates 3, 5 are blanked by punching the material plate 8 so as to remove excess portions (chips) 9 indicated by hatching of the rectangular material plate 8. Then, the blank product 10 is formed by bending the part 10 along the dashed line by pressing. The edge of the blank product 10 in FIG. 5 (b) on the left side (inward in the vehicle width direction) from the top 11 of the mountain is the central opening of the axle case 1, and to the right (outward in the vehicle width direction) from the top 11 of the mountain. ) Is the welded portion 12 between the upper side plate 3 and the lower side plate 5, and the crest portion 11 is the weld end in the vehicle width direction of the welded portion 12.

  Since the upper side plate 3 and the lower side plate 5 have the same configuration, only the upper side plate 3 will be described below.

  The interval between the alternate long and short dash lines (folded lines) of the blank 10 shown in FIG. 5B is the interval B between the upper bulging portion 2 and the upper bulging portion, as shown in FIG. 2 is substantially equal to the interval B between the bulging apexes of the bulge 2 and is set to be smoother and narrower than the interval B between the bulging start portion of the upper bulging portion 2 and the bulging apex portion. B1. It should be noted that the interval B between the portions of the upper bulging portion 2 that begins to bulge and the interval B between the bulging vertices of the upper bulging portion 2 may be slightly different, and the interval B1 may be greater than these intervals It should be narrow.

  When the blank 10 is press-molded, the right-side interval B in FIG. 5B becomes the web 13 at the beginning of the upper bulging portion 2, and the left-side interval B in FIG. 5B is the upper bulging portion. 2 becomes the web 13 at the apex of the bulge, and the center interval B1 in FIG.

  Here, the interval B shown in FIG. 5 (b) is the same as the interval B of the conventional product shown in FIG. 5 (a), and the distance from the portion of the interval B1 shown in FIG. 5 (b) to the top 11 of the mountain. A is also substantially the same as the distance A of the conventional product shown in FIG. Therefore, the interval (A + B1 + A) between the crests 11 of the blank product 10 of this embodiment shown in FIG. 5B is the same as the conventional blank shown in FIG. It becomes narrower than the space | interval (A + B + A) of the peak parts 11J of the goods 10J.

  As a result, in this embodiment, it is possible to use the raw material plate 8 that is smaller in width by B-B1 than the conventional product, the area of the chip 9 shown by hatching is reduced, and the yield of the material is greatly improved. And cost reduction can be promoted. In addition, since the area of the blank product 10 is reduced, the product (axle case 1) can be reduced in weight.

  Further, the axle case 1 according to the present embodiment does not use a triangular plate as disclosed in the cited document 2, and the number of parts is the same as that of the conventional product shown in FIG. Therefore, the number of parts does not increase, the increase in parts processing cost and the increase in assembly processing costs accompanying the increase in the number of parts can be avoided, the cost is reduced, and the durability strength decreases due to the welding of the triangular plate. Nor.

  In the axle case 1 according to the present embodiment, even if the constricted web 18 is provided, the welded portion 12 that butt welds the upper side plate 3 and the lower side plate 5 is linear like the conventional product shown in FIG. Therefore, the welding operation of the upper side plate 3 and the lower side plate 5 can be performed in the same manner as the conventional product, and there is no need to modify the welding apparatus or the like. In addition, the space in the front-rear direction between the front welded portion 12 and the rear welded portion 12 of the upper and lower side plates 3, 5, the mounting surface of the ring-shaped reinforcing member 6 in the upper and lower bulged portions 2, 4 and a substantially hemisphere Since the distance in the front-rear direction with respect to the mounting surface of the shell-like cover 7 can be made equal to that of the conventional product, it is not necessary to change the shape of the related parts, and it is not necessary to modify the conventional assembly apparatus.

  By the way, when the constricted web 18 is provided in the upper and lower bulging portions 2 and 4 as described above, the axle case 1 has a trapezoidal cross section through the constricted web 18 as shown in FIG. Since the cross-sectional area is reduced as compared with the type shown in FIG. 1 without the constricted web 18, it is inevitable that the cross-section coefficient with respect to the center line through which the axle passes (neutral axis of the axle case 1) is partially reduced. However, even if the constricted web 18 is provided, the width in the front-rear direction of the portion (welded portion 12) where the height from the neutral shaft is minimum, that is, the section modulus is minimum, is the same as that of the conventional axle case 1J. It is possible to minimize the influence of the constricted web 18 on the strength and rigidity of the entire axle case 1.

  Modified embodiments of the present invention are shown in FIGS.

  As shown in FIG. 6, the axle case 1a is basically the same as the axle case 1 of the previous embodiment, and the constricted web 18 of the upper bulging portion 2 and the lower bulging portion 4 is used as the axle. The only difference from the previous embodiment is that the cross section cut perpendicularly and perpendicularly is a U-shape with the lower part opened. Therefore, the same components as those of the previous embodiment are denoted by the same reference numerals, description thereof is omitted, and only differences are described.

  The development of the upper side plate 3a and the lower side plate 5a of the axle case 1a is the same as the development of the upper side plate 3 and the lower side plate 5 of the previous embodiment shown in FIG. That is, the blank product 10 itself is the same, and the point of folding along the alternate long and short dash line is also the same, but the other parts (the valley 19 part) are deformed by press molding.

  That is, as shown in FIG. 7A, the upper bulging portion 2a and the lower bulging portion 4a of the axle case 1a are swollen with respect to the constricted web 18 and the apex side is perpendicular to the axle. As shown in FIG. 7B, the cut cross section is a wide U-shape with the lower part open, and as shown in FIG. 7 (b), the narrow cross section of the constricted web 18 cut perpendicularly to the axle is open with the lower part open. As shown in FIG. 7 (c), a wide U-shaped cross section in which a section of the constricted web 18 at the beginning of bulging is cut perpendicularly perpendicular to the axle and the lower part is opened. It has become. As shown in FIG. 8, V-shaped valleys 19 a are formed in the vertical direction on the flanges 14, 16 of the upper and lower bulges 2 a, 4 a on both sides of the central opening.

  Since this modified embodiment has the same configuration as the previous embodiment except that the welded portion 12 is not linear, the modified embodiment is the same as the previous embodiment except for the effects resulting from the welded portion 12 being linear. The same effect can be exhibited. The constricted web 18 may not be provided on both the upper and lower bulged portions 2a and 4a, but may be provided on only one of them.

  Another modified embodiment of the present invention will be described with reference to FIGS.

  The embodiment described so far is an axle case that does not use the triangular plate shown in FIG. 3 of Patent Document 2, but the present invention can also be applied to an axle case that uses a triangular plate.

  FIG. 10A is a development view of a conventional axle case side plate using a triangular plate, and FIG. 10B is a development view of the axle case side plate according to the present embodiment using a triangular plate. The axle case 1b according to the present embodiment is formed by pressing the blank product 10b of FIG. 10B to form the upper side plate 3b or the lower side plate 5b, and then between the peak 11b and the peak 11b. A triangular plate 20 shown in FIG. The axle case 1b has the same configuration as that of the first embodiment except that the triangular plate 20 is welded between the peak 11b and the peak 11b. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The axle case 1b according to this embodiment, as is apparent from the comparison between FIGS. 10 (a) and 10 (b), the size of the material plate 8b itself is not so much reduced, so the upper and lower side plates 3b, The effect of improving the yield of 5b itself is small. However, the weight reduction of the axle case 1b and the reduction of the parts cost and the assembly cost associated with the downsizing of the triangular plate 20 can be achieved, and in addition, the welding position of the triangular plate 20 approaches the neutral axis of the axle case 1b. Durability is also improved.

DESCRIPTION OF SYMBOLS 1 Axle case 2 Upper bulge part 3 Upper side plate 4 Lower bulge part 5 Lower side plate 13 Web 18 Neck web

Claims (3)

An upper side plate that is formed in a groove-shaped cross section that is open at the bottom along the vehicle width direction, and has an upper bulging portion in the vehicle width direction center;
A lower side plate formed in a groove-shaped cross-section with the upper part opened along the vehicle width direction, and having a lower bulge at the center in the vehicle width direction;
An axle case of a sheet metal welding assembly structure in which the upper side plate and the lower side plate are welded to face each other,
The upper bulging portion has a web in which a vehicle width direction central portion bulges upward,
The lower bulging part has a web in which a central part in the vehicle width direction bulges downward,
At least one of the upper bulging portion and the lower bulging portion is formed between the beginning of the bulging along the web width direction of the web and the portion between the bulging apexes. An axle case having a constricted web formed narrower than the width.   The cross section obtained by obliquely cutting the constricted web portions of the upper bulging portion and the lower bulging portion from the inside to the outside of each bulging portion with respect to the axle is a trapezoid whose bottom is open. Axle case described.   The axle case according to claim 1, wherein a cross section of the constricted web portion of the upper bulging portion and the lower bulging portion, which is cut perpendicularly perpendicular to the axle, has a U-shape with the lower part open.

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