JP5596512B2 - Body frame - Google Patents

Description

  The present invention relates to a vehicle body in which side members (side rails) having a U-shaped cross section are arranged so as to face each other at intervals in the vehicle width direction, and a plurality of holes used for mounting parts are formed in the left and right side members. Regarding the frame.

  As shown in FIGS. 1 (a) and 1 (b), a vehicle body frame used in a vehicle such as a truck, bus, RV, or pickup has a side member 1 formed along the longitudinal direction of the vehicle body. The left and right side members 1 are connected by a plurality of cross members (not shown) spaced in the front-rear direction of the vehicle body to form a so-called ladder frame. The side member 1 is formed in a U-shaped cross section from a web 2 and flanges 3 and 4 formed at right angles to the upper and lower sides thereof, and is arranged so that the inner sides of the U-shape face each other. A plurality of holes (not shown) used for component attachment or the like are formed in the web 2 and the flanges 3 and 4 of the side member 1 (Patent Documents 1 and 2).

  As shown in FIGS. 1 (a) and 1 (b), the side member 1 of the body frame for trucks or the like is kicked down with an upper surface flange 3f formed at the front end as shown in FIGS. 1 (a) and 1 (b). 2a and 2b, and the bottom flange 4r of the rear end portion is formed to rise rearward and kicked up. These side members 1 have a shape ( The outer shape is mirror-symmetrical (symmetric) on the left and right. Moreover, the hole opened in the side member 1 is arrange | positioned by the left-right side member 1 left-right mirror-symmetrically, or each right-and-left free (random). A manufacturing process of such a side member 1 will be described with reference to FIG.

  First, the material plate (steel plate) 5 shown in FIG. 3 (a) is trimmed and perforated with an outer peripheral shape by cut-cut piercing (punching using a cut piercing die) as shown in FIG. 3 (b). 3 (c1) and blank product 6 shown in FIG. 3 (c2) are manufactured. Next, as shown in FIGS. 3 (d1) and 3 (d2), the blank 6 is subjected to foaming (pressing) to form side members 1R and 1L having a U-shaped cross section. In cut piercing, the same die (cut piercing type) is usually used for the right side member (for RH (right hand)) 1R and the left side member (for LH (left hand)) 1L in order to reduce costs. Use the same blank product 6 on the left and right.

  Therefore, in order to obtain a pair of side members 1R and 1L that are symmetrical with respect to the left and right mirror surfaces, the blank product 6 for RH is subjected to foam processing as it is, but the blank product 6 for LH is turned upside down to perform foam processing. It will be. In FIG. 3, when the cut piercing direction A is represented by an arrow and the cut piercing surface B is represented by a dot, the side member 1R for RH has a cut piercing surface B inside the U-shaped side member 1R as shown in FIG. The outer side of the U-shaped side member 1L for LH is a cut piercing surface B.

  As for the hole 7 opened by the cut piercing process, the cut piercing surface B side becomes the shearing surface 7a, and the opposite side becomes the fracture surface 7b. Accordingly, in the LH side member 1L as shown in FIG. 5A, the outer side of the U-shape is the shear surface 7a, and the inner side of the U-shape is the fractured surface 7b, and as shown in FIG. In the side member 1R, the U-shaped inner side is the shearing surface 7a, and the U-shaped outer side is the fracture surface 7b. The diameter of the hole 7 on the side of the shearing surface 7a has a predetermined accuracy based on the pierce type, but the diameter of the hole 7 on the side of the fracture surface 7b is torn off in the middle of the punching, and thus is more irregular than the diameter targeted by the pierce type Will become bigger.

JP 2005-153810 A Japanese Utility Model Publication No. 2009-269584

  As shown in FIG. 4, a plurality of nuts 8 are attached inside the side members 1 </ b> L and 1 </ b> R in accordance with the positions of the holes 7 in consideration of workability during frame assembly and vehicle assembly. .

  As shown in FIGS. 6 and 7, the nut 8 is provided with a guide 9 inserted (press-fitted) into the hole 7 (positioning nut, press caulking nut, driving nut, etc.) to increase the accuracy of the mounting position. ) Is used. Serrations or the like may be formed on the outer periphery of the guide 9. The size of the guide 9 is set based on the diameter of the hole 7 on the shearing surface 7a side. Therefore, when the guide 9 is inserted on the shearing surface 7a side of the hole 7 as shown in FIG. 6, the accuracy of the mounting position of the nut 8 can be ensured. However, as shown in FIG. When inserted on the fracture surface 7b side, an irregular gap is generated between the guide 9 and the hole 7, so that the mounting position accuracy of the nut 8 is deteriorated.

  As a countermeasure, at present, as shown in FIG. 8, the nut 8 is temporarily fixed with the bolt 10 from the opposite side while the nut 8 is applied to the inside of the side member 1 in accordance with the position of the hole 7. The position 10a is brought into contact with the shearing surface 7a of the hole 7 so that the position accuracy of the nut 8 is ensured. In this state, the nut 8 is welded to the side member 1 (arc welding), and then the bolt 10 is removed. ing. Reference numeral 12 denotes a welded portion. However, such an installation work of the nut 8 is troublesome because it requires a lot of man-hours, increases the work time, increases the cost, and requires welding, so arc sparks and spatter scattering are unavoidable. The problem arises that the environment is not good.

  If the hole 7 of the side member 1 can be used as the shearing surface 7a side for both the RH and LH, the nuts (positioning nuts etc.) 8 having the guides 9 described above are used on the left and right side members 1R and 1L, respectively. Therefore, it is not necessary to temporarily fix the bolt 10 and the problem is solved. For that purpose, different pierce dies (metal molds) are used for the RH side member 1R and the LH side member 1L, respectively, and the left and right sides are punched from the surface side that will be the inside of the U-shaped cross section in the future. It is also conceivable to manufacture blank products 6 for the RH and LH separately by punching from the surface side which will be the inside of the U-shaped cross section in the future. However, the former has a demerit that the mold cost is doubled and the latter has a higher cost than the mold processing.

  Moreover, since the hole 7 without the fracture surface 7b can be formed by drilling or drilling a hole, the above problem is solved. However, both methods have a demerit that the processing cost is higher than that of press working.

  The first object of the present invention, which was created in view of the above circumstances, is that the holes provided in the side members are formed by pressing a single cut piercing die so that the left and right side members have a U-shaped inner surface. An object of the present invention is to provide a vehicle body frame that can be molded so that it can be manufactured at low cost.

  The second object of the present invention is to reduce the mounting man-hour by using the nut provided with the above-mentioned guide as the nut attached to the inside of the U-shape of the left and right side members in accordance with the position of the hole. An object of the present invention is to provide a vehicle body frame that eliminates the welding work and improves the work environment.

The invention according to claim 1 devised to achieve the above object is a vehicle body frame in which side members having a U-shaped cross section are arranged so that the inner sides of the U shape face each other at intervals in the vehicle width direction. Each of the left and right side members in the vehicle width direction has a plurality of point-symmetric holes with respect to the vehicle center axis extending in the longitudinal direction of the vehicle body, and the holes are formed by punching from the inside of the U-shape of the side members. A shear surface is formed on the punched side portion of the hole located inside the U-shape of the side member, and the shear surface is formed on the counter-punched side portion of the hole located outside the U-shape of the side member. The vehicle body frame is characterized in that a fracture surface having a larger hole diameter is formed, and a nut attached to the hole from the inside of the U-shape of the side member includes a guide that contacts the shearing surface of the hole. .

The invention according to claim 2 is the vehicle body frame according to claim 1 , wherein a height of the guide from the bottom surface of the nut is smaller than a plate thickness of the side member in which the hole is formed .

  The invention according to claim 3 is the vehicle body frame according to claim 1, wherein the side members on the left and right sides in the vehicle width direction have a single vertically symmetrical shape.

  The invention according to claim 4 is the vehicle body frame according to claim 1 or 2, wherein the side members on the left and right in the vehicle width direction are mirror-symmetrical on the left and right.

  According to the present invention, the following effects can be exhibited.

(1) According to the vehicle body frame of the first aspect, each of the left and right side members has a plurality of point-symmetrical holes with respect to the vehicle center axis. The left and right side members can be formed by punching from the inside of the U shape by press working. That is, by pressing using one cut piercing die, a hole having a U-shaped inside as a shearing surface can be formed on both the left and right side members. Therefore, the vehicle body frame can be manufactured at a low cost.

(2) Further , since the nut attached to the hole from the inside of the U-shaped side member is provided with a guide that contacts the shearing surface of the hole, the nut guide comes into contact with the shearing surface of the hole. Positioning is done. Therefore, both the left and right side members can ensure the accuracy of the nut mounting position. Therefore, the temporary fixing of the bolt (see FIG. 8) becomes unnecessary, and the man-hour for attaching the nut can be reduced. If the nut is fixed by press-fitting the guide into the hole, the welding of the nut (see FIG. 8) becomes unnecessary, and the nut installation work environment can be improved.

(3) According to the vehicle body frame of the third aspect, in addition to the holes formed in the left and right side members being point-symmetric with respect to the vehicle center axis, the left and right side members are each vertically symmetric. Therefore, the left and right side members can be manufactured by stamping by using one cut piercing die. Therefore, it can be manufactured at low cost.

(4) According to the vehicle body frame of the fourth aspect, the left and right side members have a plurality of point-symmetric holes with respect to the vehicle central axis, and the left and right side members have a mirror-symmetrical shape. The cutting blade for trimming is built into the cut earring type so that it can be inserted and removed, and the left and right side members are manufactured with one cut earring type by making the right and left the piercing positions for punching holes different. it can.

It is a schematic diagram of the vehicle body frame which shows a prior art example, (a) is a perspective view, (b) is a side view. It is a schematic diagram of the vehicle body frame which shows another prior art example, (a) is a perspective view, (b) is a side view. It is explanatory drawing which shows the manufacturing process of the side member of the vehicle body frame of FIG. It is sectional drawing of the conventional side member. (A) is sectional drawing of the LH side member of FIG. 4, (b) is sectional drawing of the RH side member of FIG. It is sectional drawing which mounted | wore the positioning nut to the shearing surface side of the hole of a side member. It is sectional drawing which mounted | wore the positioning nut to the fracture surface side of the hole of a side member. It is sectional drawing which bolted the bolt temporarily in the state which applied the nut to the hole of the side member, and welded the nut. It is a perspective view showing the outline of the body frame which shows one embodiment of the present invention. FIG. 10 is an explanatory view of a side member of the vehicle body frame of FIG. 9, (a1) is an inner side view of the RH side member, (b1) is a front view of the RH side member, and (a2) is an outer side surface of the LH side member. FIG. 4B is a front view of the LH side member. FIG. 10 is a cross-sectional view of the side member of FIG. 9. It is explanatory drawing which shows the manufacturing process of the side member of FIG. It is explanatory drawing of the vehicle body frame which shows the 1st modification of this invention, (a) is a perspective view, (b) is a side view. It is a side view of the body frame which shows the 2nd modification of the present invention. It is explanatory drawing which shows the manufacturing process of the side member of the vehicle body frame which shows the 3rd modification of this invention. (A) is a side view of a vehicle body frame showing a fourth modified embodiment of the present invention, and (b) is a side view of the vehicle body frame showing a fifth modified embodiment of the present invention.

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

  As shown in FIG. 9, the vehicle body frame S according to the present embodiment has the U-shaped side members 1 arranged so that the inner sides of the U-faces face each other at intervals in the vehicle width direction. The member 1 is connected by a plurality of cross members (not shown) spaced in the front-rear direction of the vehicle body to form a so-called ladder frame. The side member 1 has a web 2 that is vertically arranged and flanges 3 and 4 that are arranged vertically at the top and bottom thereof, and is formed in a U-shaped cross section along the longitudinal direction of the vehicle body. The left and right side members 1 have a straight shape with a uniform cross section over the entire length, and each has a vertically symmetrical shape when viewed from the side.

  As shown in FIG. 10, the left and right side members 1R, 1L are formed with a plurality of holes 7 used for mounting components. The hole 7 may be formed in one or both of the upper and lower flanges 3 and 4 as well as the web 2 of the side members 1R and 1L. As shown in FIG. 11, these holes 7 are arranged in point symmetry (180-degree rotational symmetry) with respect to the vehicle center axis X extending in the longitudinal direction of the vehicle body. For example, the upper hole 7 of the RH side member 1R is moved to a point-symmetrical position with respect to the vehicle center axis X, and corresponds to the lower hole 7 of the LH side member 1L. The vehicle center axis X is an imaginary axis that is disposed at a position where the horizontal distance from the web 2 of the left and right side members 1R, 1L is equal and the vertical height difference from the upper and lower flanges 3, 4 is equal, and extends in the front-rear direction of the vehicle body. It is.

  The manufacturing process of the side members 1R and 1L is shown in FIG. First, the material plate (steel plate) 5 shown in FIG. 12A is cut and pierced, and holes 7 are formed as shown in FIGS. 12B1 and 12B2 to obtain a blank 6. In this embodiment, since the side members 1R and 1L are straight, only piercing may be performed without performing cutting. The cut piercing direction A is represented by an arrow, and the cut piercing surface B is represented by a dot. Thereafter, the left and right blanks 6 are subjected to form processing by pressing from the cut piercing surface B side to produce side members 1R and 1L having a U-shaped cross section as shown in FIGS. 12 (c1) and 12 (c2).

  As a result, as shown in FIG. 11, the holes 7 formed in the left and right side members 1 </ b> R and 1 </ b> L are both pierced from the inside of the U shape, and the inside of the U shape is the shearing surface 7 a of the hole 7. Become the side. Therefore, when the nut 8 is mounted inside the U shape in accordance with the position of the hole 7, as shown in FIG. 6, a nut (a positioning nut, a press caulking nut, a driving nut) provided with a guide 9 inserted into the hole 7 is provided. When a nut or the like) 8 is used, the guide 9 comes into contact with the shearing surface 7a of the hole 7, and the accuracy of the mounting position of the nut 8 can be ensured for each of the left and right side members 1R and 1L. Therefore, as described with reference to FIG. 8, the conventional temporary fixing of the bolt 10 and welding of the nut 8 (welded portion 12) are not required, and the number of mounting steps of the nut 8 can be reduced. In addition, the welding work environment of the nut 8 can be improved since there are no welding sparks or spatter scattering.

  Further, the holes 7 of the left and right side members 1R, 1L are point-symmetric with respect to the vehicle center axis X, and the shapes of the left and right side members 1R, 1L are straight, that is, vertically symmetrical in side view, and therefore are used for cut piercing. The cut earring type can be the same for both RH and LH. Therefore, the blank product 6 can be manufactured at low cost. In addition, since the left and right side members 1R and 1L are both straight (symmetrical when viewed from the side), the pressing mold used for foam processing can be the same for both RH and LH, and the cost is low. Thus, the side members 1R and 1L can be manufactured.

  Here, if the arrangement pattern of the holes 7 is completely point-symmetrical between the RH side member 1R and the LH side member 1L, the left and right side members 1R, 1L have a straight shape (symmetrical shape when viewed from the side). Therefore, the left and right side members 1R and 1L are the same product. That is, in FIG. 11, when the RH side member 1R is rotated 180 degrees with respect to the vehicle center axis X, the LH side member 1L is obtained. Therefore, as described above, the completely same mold can be used as the cut piercing mold for cutting and piercing the left and right side members 1R and 1L.

  However, it is possible to create the presence or absence of holes 7 by inserting / removing several piercing punches of a cut piercing die (mold) or adding an empty stroke mechanism to several piercing punches. Even if there are several holes 7 that are not point-symmetric in the members 1R and 1L, one cut piercing type can be used. Even in this case, since one cut piercing type itself is used, the cost is lower than the case where separate cut piercing types are used for the RH side member 1R and the LH side member 1L.

  That is, if the left and right side members 1R, 1L have a plurality of point-symmetric holes 7 with respect to the vehicle center axis X, the shape is straight even if there are some non-point-symmetric holes 7 If the shape is symmetrical in the side view, the blank product 6 of the left and right side members 1R and 1L can be punched out using one cut piercing die. Then, the left and right side members 1R and 1L can be manufactured by forming the left and right blanks 6 using a single press die.

  FIG. 13 shows a vehicle body frame S1 according to a first modified embodiment of the present invention.

  The vehicle body frame S1 according to this embodiment has the same basic configuration as the vehicle body frame S of the first embodiment described above with reference to FIGS. It differs from the first embodiment only in that it is formed so as to be lowered forward and kicked down, and the lower surface flange 4f is formed so as to be raised backward and kicked up.

  The kick-up portion of the upper surface flange 3f and the lower surface flange 4f kick-down portion are formed symmetrically in the vertical direction when viewed from the side. That is, the side member 1 of this embodiment also has a vertically symmetric shape in side view, similar to the straight-shaped side member 1 of the first embodiment. Further, the holes 7 (not shown in FIG. 13) of the left and right side members 1 of this embodiment are also point-symmetric with respect to the vehicle center axis X on the left and right as in the first embodiment.

  Accordingly, in this embodiment, the left and right side members 1 are the same product, and the blank product 6 of the left and right side members 1 can be manufactured using one cut piercing die as in the first embodiment. The inside of the U-shape of the left and right side members 1 can be set to the shearing surface 7a side of the hole 7 by performing foam processing for each of the products 6 from the cut piercing surface B side using one press die.

  In addition, since the basic operational effects of this embodiment are the same as those of the first embodiment, the description thereof is omitted. For example, if the left and right side members 1 have a plurality of point-symmetric holes 7 with respect to the vehicle center axis X, even if there are several holes 7 that are not point-symmetric, one cut piercing type can be used. What can be done is the same as in the previous embodiment.

  FIG. 14 shows a vehicle body frame S2 according to a second modified embodiment of the present invention.

  The vehicle body frame S2 according to this embodiment has the same basic configuration as the vehicle body frame S1 of the previous embodiment described with reference to FIG. 13, and the upper surface flange 3r of the rear end portion of the side member 1 slopes downward. It is different from the previous embodiment only in that it is formed into a shape and kicked down, and the lower surface flange 4r is formed in a slope shape to rise rearward and kicked up.

  The kick-up portion of the lower surface flange 4r at the rear end and the kick-down portion of the upper surface flange 3r are formed vertically symmetrical in a side view, and the arrangement of the holes 7 (not shown in FIG. 14) of the left and right side members 1 is arranged in the vehicle. It is point-symmetric with respect to the central axis X. Therefore, also in this embodiment, the left and right side members 1 are the same product, and the same effect as the previous embodiment is achieved.

  In the above embodiments, the left and right side members 1 have been described as being singularly symmetrical in the side view. However, even if the left and right side members 1 are not singularly symmetric in the vertical direction, If the arrangement of the holes 7 is point-symmetric with respect to the vehicle center axis X, it is possible to achieve substantially the same effects as in the previous embodiments. This will be described below.

  FIG. 15 shows a manufacturing process of a vehicle body frame according to a third modified embodiment of the present invention.

  FIG. 15 shows a process of manufacturing the side members 1R and 1L that are single in shape and vertically asymmetric, and that the holes 7 are point-symmetric with respect to the vehicle center X on the left and right. FIG. 15A shows the material plate 5, and FIG. 15B shows the cut piercing surface B (dot), the cut line C (one-dot chain line), and the hole position (thin line) of the material plate 5. This material plate 5 is cut and pierced.

  In the cut earring type used for it, the cutting blades for trimming the kick-up part are installed on both the upper and lower sides of the cut earring type, and when machining for RH, only the upper cutting blade is operated. When processing for LH, the left and right blanks 6 having different trimming shapes are manufactured by operating only the lower cutting blade.

  The left and right blanks 6 are shown in FIGS. The cut shape of the left and right blanks 6 is left-right mirror-symmetric. When the left and right blanks 6 are cut and pierced using the cut piercing dies, if the positions of the above-mentioned cut piercing piercing punches are fixed to the left and right blanks 6, the holes 7 are arranged on the left and right side members. 1R and 1L are point-symmetric with respect to the vehicle center axis X.

  Thus, even if the shape of the single side members 1R, 1L is vertically asymmetrical, if the left and right holes 7 are arranged point-symmetrically, the left and right blanks 6 are punched out using one cut piercing die. Compared with the case where two cut earring types for RH and LH are used, left and right blanks can be manufactured at low cost.

  Thereafter, the left and right blanks 6 with different trimmings in the kick-down portion are subjected to foam processing from the cut piercing surface B side by the foam molds having the respective kick-down shapes, and FIGS. 15 (c1) and 15 (c2). As shown, side members 1R and 1L having a U-shaped cross section are manufactured.

  By using these left and right side members 1R, 1L, the left and right side members 1R, 1L in the vehicle width direction are mirror-symmetrical on the left and right (see FIG. 2), and each of the left and right side members 1R, 1L is the vehicle center. A body frame (see FIG. 11) having a plurality of point-symmetric holes 7 with respect to the axis X (see FIG. 11) and each hole 7 punched out from the inside of the U-shaped side member can be obtained.

  Also in this embodiment, if the left and right side members 1R, 1L have a plurality of point-symmetric holes 7 with respect to the vehicle center axis X, even if there are some non-point-symmetric holes 7, By using a cut piercing die that adds a blank stroke mechanism to several piercing punches, it is possible to cope with one cut piercing die as in the previous embodiments.

  FIG. 16A shows a vehicle body frame according to the fourth modified embodiment of the present invention, and FIG. 16B shows a vehicle body frame according to the fifth modified embodiment of the present invention.

  In these embodiments, the side member 1 having the kick-up portion and the kick-down portion is divided and connected to the straight portion 1a and the other portion 1b in the longitudinal direction, and the straight portion 1a is shown in FIG. The first embodiment described above with reference to FIG. 12 is applied.

  In the side member 1, the length of the straight portion 1a is usually much longer than the length of the other portion 1b. Therefore, the present invention can be applied to most of the length of the side member 1 to promote cost reduction. it can.

  The present invention is not limited to the above-described embodiments, and various embodiments are included as long as they do not depart from the invention described in the claims.

DESCRIPTION OF SYMBOLS 1 Side member 1R RH side member 1L LH side member 2 Web 3 Upper flange 4 Lower flange 5 Material plate 6 Blank product 7 Hole 7a Shear surface of hole 7b Hole fracture surface 8 Nut 9 Guide S Car body Frame X Vehicle center axis A Cut piercing direction B Cut piercing surface

Claims (4)

A body frame in which U-shaped side members are arranged so that the insides of the U-shapes face each other at intervals in the vehicle width direction,
Each of the left and right side members in the vehicle width direction has a plurality of point-symmetric holes with respect to the vehicle center axis extending in the vehicle longitudinal direction,
The hole is formed by punching from the inside of the U-shaped side member ,
A shearing surface is formed on the punching side portion of the hole located inside the U-shape of the side member,
A fracture surface having a larger hole diameter than the shearing surface is formed on the side of the hole opposite to the punched side located on the outer side of the U-shaped side member.
A vehicle body frame , wherein a nut attached to the hole from the inside of the U-shape of the side member is provided with a guide in contact with the shearing surface of the hole . The body frame according to claim 1 , wherein a height of the guide from the bottom surface of the nut is smaller than a plate thickness of the side member in which the hole is formed . The vehicle body frame according to claim 1, wherein the side members on the left and right sides in the vehicle width direction have a single vertically symmetrical shape. The body frame according to claim 1, wherein the side members on the left and right in the vehicle width direction have a mirror-symmetric shape on the left and right.

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