JP2010100248A - Bracket welding structure on axle case - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bracket welding structure on an axle case that uniformly distributes stresses of individual welded portions of the bracket on the axle case, thereby enhancing durability of the bracket, reducing an area occupied by the bracket, and avoiding a defect of welding. <P>SOLUTION: In the bracket welding structure, a bracket 6 mounting a suspension member connected to a vehicle body frame is welded on an expanded central portion 3 of an axle case 1. The bracket 6 includes a horizontal plate member 61 along the axle direction and a pair of vertical plate members 62 disposed orthogonally to the axle at both axle directional ends of the horizontal plate member 61. Out of these vertical plate members 62, at least one end face has a slanted portion 8 with part of the end face slanted along the expanded central portion 3, and the remaining of the end face forms a non-slanted portion 9. The vertical plate member 62 and the expanded central portion 3 are fixed by fillet welding, with the slanted portion 8 hit the expanded central portion 3 and the non-slanted portion 9 separated from the expanded central portion 3. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a structure in which a bracket for a suspension member is welded to a central bulge portion of an axle case.

  As shown in FIG. 1, as an axle case 1, a case main body 2 in which an upper plate 21 and a lower plate 22 formed in a U-shaped cross section are abutted and welded in the middle, and a central bulge portion 3 of the case main body 2 is provided. A bowl-shaped lid 4 attached so as to cover one of the openings, and a ring 5 attached to the central bulge portion 3 so as to surround the other opening are known. A bracket 6x to which an upper torque rod is attached is welded to the upper portion of the central bulge portion 3 (see Patent Document 1).

  As shown in FIG. 2, the bracket 6x includes a horizontal plate member 61 along the axle direction, and a pair of vertical plate members 62 disposed at both ends in the axle direction of the horizontal plate member 61 so as to be orthogonal to the axle. And has a structure in which these are assembled.

  As shown in FIG. 3, the vertical plate member 62 has a bent portion 63 that is bent in the vehicle width direction along the inclination of the central bulge portion 3 at the lower end, and the end surface of the bent portion 63 is the center. The fillet 3 is welded to the fillet. That is, when the vertical plate member 62 is disposed in a plane orthogonal to the axle, the left and right sides of the central bulge portion 3 to which the vertical plate member 62 is attached are inclined with respect to the axle, so that the lower end of the vertical plate member 62 is Is bent in the vehicle width direction along the inclination of the central bulge portion 3, and the end surface of the bent portion 63 is fillet welded to the central bulge portion 3. In the drawing, the dots 64 represent welds of the vertical plate member 62.

  The horizontal plate member 61 includes a front horizontal plate member 61a and a rear horizontal plate member 61b, and a spacer 65 is interposed therebetween. The front horizontal plate member 61a and the rear horizontal plate member 61b are disposed in a plane substantially orthogonal to the upper surface of the central bulge portion 3 along the axle. The front horizontal plate member 61a has a lower end abutted at right angles to the central bulge portion 3 and is fillet welded, and the rear horizontal plate member 61b is folded at the lower end along the central bulge portion 3 and bent backward. A bent portion 66 is provided, and an end surface of the bent portion 66 is fillet welded to the central bulge portion 3. In the figure, the dot 67 represents a welded portion of the horizontal plate member 61.

JP-A-8-67108

  By the way, since there is not enough space on the upper surface of the central bulge portion 3 of the axle case 1 to bend the lower end of the rear horizontal plate member 61b rearward along the central bulge portion 3, the bent portion of the rear horizontal plate member 61b. 66 is narrower than the bent portion 63 of the vertical plate member 62. Therefore, when a longitudinal load is input to the bracket 6x via a torque rod (not shown) and a tensile stress is generated in the welded portions 64 and 67 between the bracket 6x and the central bulge portion 3, the horizontal plate member 61 is used. The coupling stiffness between the front lateral plate member 61a and the rear lateral plate member 61b and the central bulge portion 3 is higher than that between the vertical plate member 62 and the central bulge portion 3.

  That is, the front lateral plate member 61a is abutted against the central bulge portion 3 and welded, and the rear lateral plate member 61b is welded to the central bulge portion 3 via the narrow bent portion 66. The plate member 61 has higher rigidity against the tensile stress than the vertical plate member 62 welded to the central bulge portion 3 via the wide bent portion 63. Therefore, when the tensile stress is generated, the stress sharing of the welded portion 64 of the vertical plate member 62 having a low rigidity is smaller than the stress sharing of the welded portion 67 of the horizontal plate member 61 having a high rigidity. The problem of inferiority arises.

  Further, since the flange 63 of the vertical plate member 62 has a certain length in the vehicle width direction, the occupied area when the bracket 6x is mounted on the upper surface of the central bulge portion 3 of the axle case 1 is increased, There also arises a problem that the arrangement position of other brackets attached to the upper surface of the bulging portion 3 is restricted.

  Therefore, the present inventor removes the bent portion 63 of the vertical plate member 62 to make the vertical plate member 62 a simple plate as shown in FIG. 4, and its lower end is placed on the upper surface of the central bulge portion 3 of the axle case 1. I thought about welding to fillet.

  However, the inclination angle of the central bulge portion 3 (the angle of the upper surface of the central bulge portion 3 with respect to the horizontal plane) is as small as 30 degrees or less, and the opening direction of the gap between the lower end of the vertical plate member 62 and the upper surface of the central bulge portion 3 Since the welding torch cannot be properly inserted deeply into the gap, it is difficult to completely fill the gap with weld metal during fillet welding. (Gap) 7 is likely to occur.

  The object of the present invention created in view of the above circumstances is that the stress sharing of the welded portion of the vertical plate member of the bracket and the axle case of the horizontal plate member is uniform and the durability is improved, and the occupied area of the bracket is increased. An object of the present invention is to provide a bracket welded part structure of an axle case that is small and can avoid welding defects between the bracket and the axle case.

  In order to achieve the above object, the present invention has a structure in which a bracket to which a suspension member connected to a vehicle body frame is attached is welded to a central bulge portion of an axle case, and the bracket extends along the axle direction. A horizontal plate member and a pair of vertical plate members disposed at both ends in the axial direction of the horizontal plate member so as to be orthogonal to the axle, and at least one end surface of the vertical plate members has one end surface Forming an inclined portion that is inclined in accordance with the inclination of the central bulge portion, the remaining portion of the end face is a non-inclined portion, the inclined portion is abutted against the central bulge portion, and the non-inclined portion is the center The vertical plate member and the central bulge portion are fixed by fillet welding in a state of being separated from the bulge portion.

  The inclination angle of the inclined part is preferably within 30 degrees.

  The dimension of the inclined portion in the axle direction is preferably in the range of 1/3 to 4/5 of the plate thickness of the vertical plate member.

  According to the bracket case welded portion structure of the axle case according to the present invention, the stress sharing of the welded portion of the vertical plate member and the horizontal plate member of the bracket with respect to the axle case is uniform, and the durability is improved and the occupied area of the bracket is reduced. It is possible to suppress welding defects between the bracket and the axle case.

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

  As shown in FIG. 5, the axle case 1 includes a case main body 2 in which an upper plate 21 and a lower plate 22 formed in a U-shaped cross section are butted in the middle and welded, and a central bulge portion 3 of the case main body 2. And a ring-shaped lid 4 attached to the central bulge portion 3 so as to surround the other opening. A bracket 6 to which the upper torque rod is attached is welded to the upper portion of the central bulge portion 3.

  As shown in FIG. 6, the bracket 6 includes a horizontal plate member 61 along the axle direction, and a pair of vertical plate members 62 disposed at both ends in the axle direction of the horizontal plate member 61 so as to be orthogonal to the axle. I have. The horizontal plate member 61 includes a front horizontal plate member 61a and a rear horizontal plate member 61b, and a spacer 65 is interposed therebetween.

  As shown also in FIG. 7, the front horizontal plate member 61 a has a lower end formed in an arc shape (bow shape) in accordance with the curve of the upper surface of the central bulge portion 3, and its lower end is perpendicular to the upper surface of the central bulge portion 3. The fillet is welded. The dot 67 is a welded part. The rear horizontal plate member 61b has an inclined portion 68 inclined backward, and a bent portion 66 bent backward along the upper surface of the central bulge portion 3 at the lower end of the inclined portion 68. The end surface of the portion 66 is fillet welded to the upper surface of the central bulge portion 3.

  On the other hand, on the lower end surface of the vertical plate member 62, an inclined portion 8 in which a part of the end surface (portion inside in the vehicle width direction) is inclined in accordance with the inclination of the upper surface of the central bulge portion 3, and the remaining portion (vehicle width direction) The non-inclined portion 9 of the outer portion) is formed. Then, the vertical plate member 62 and the central bulge portion 3 are fixed by fillet welding in a state where the inclined portion 8 is abutted against the upper surface of the central bulge portion 3 and the non-inclined portion 9 is separated from the upper surface of the central bulge portion 3. ing. The dots 64 are welds.

  The operation of this embodiment will be described.

  According to this bracket case welded part structure of the axle case, the lower end of the front horizontal plate member 61a is welded by abutting against the central bulge portion 3, and the narrow bent portion 66 formed at the lower end of the rear horizontal plate member 61b is formed. When being welded to the central bulge portion 3, the vertical plate member 62 is also welded with its lower end abutted against the central bulge portion 3. For this reason, when a longitudinal load is input to the bracket 6 via the torque rod and a tensile stress is generated in the welded portions 64 and 67 between the bracket 6 and the central bulge portion 3, the horizontal plate member 61 (front horizontal plate member) 61a, the rear horizontal plate member 61b) and the joint rigidity of the central bulge portion 3, and the joint rigidity of the vertical plate member 62 and the central bulge portion 3 are substantially equal.

  Therefore, when the said tensile stress generate | occur | produces, the stress sharing of the welding part 64 of the vertical plate member 62 and the stress sharing of the welding part 67 of the horizontal plate member 61 become substantially uniform, and durability improves.

  Further, the vertical plate member 62 of the present embodiment has its lower end abutted against and welded to the upper surface of the central bulge portion 3, and does not have the wide bent portion 63 shown in FIG. For this reason, the bracket 6 of the present embodiment has a smaller occupied area (an attachment area with respect to the central bulge portion 3) by the wide bent portion 63 described above.

  Therefore, there is no restriction on the arrangement position of other brackets attached to the upper surface of the central bulge portion 3.

  For example, as shown in FIG. 8, the torque rod bracket 6 according to the present invention is welded to the upper surface of the central bulge portion 3, and an air chamber actuator for operating a brake is sandwiched between the brackets. The bracket 10 to be mounted is welded. According to the vertical plate member 62 of the present invention, there is no restriction on the arrangement position of the bracket 10 for the actuator because there is no wide bent portion 63 shown in FIG.

  Further, as shown in FIG. 7, the vertical plate member 62 of the bracket 6 of the present embodiment has the lower inclined portion 8 abutted against the upper surface of the central bulge portion 3 and the non-inclined portion 9 of the central bulge portion 3. Since the welding is performed in a state of being separated from the upper surface, the gap between the lower end of the vertical plate member 62 and the central bulge portion 3 is smaller than that of the vertical plate member 62 of the bracket 6y shown in FIG. Becomes smaller.

  Therefore, the welding defect 7 between the bracket 6 and the central bulging portion 3 of the axle case 1 can be suppressed or reduced.

  In FIG. 7, the inclination angle θ of the inclined portion 8 at the lower end of the vertical plate member 62 (the angle of the inclined portion 8 with respect to the non-inclined portion 9 = the inclination angle of the upper surface of the central bulge portion 3) is preferably 30 degrees or less.

  This is because there is almost no axle case 1 having an inclination angle θ of 30 ° or more on the upper surface of the central bulge portion 3, and even if it exists, if the inclination angle θ is 30 ° or more, the welding torch is used as a vertical plate member. It is because it can insert between the lower end of 62 and the center swelling part 3, and the problem of the welding defect 7 does not arise easily.

  In addition, when the inclination angle θ of the inclined portion 8 is less than 15 degrees, there is not much difference from the case where they are abutted at a right angle, and in this case also, the problem of the weld defect 7 hardly occurs.

  Therefore, the inclination angle θ of the inclined portion 8 is preferably in the range of 15 to 30 degrees (particularly 20 to 30 degrees).

  The dimension A in the axle direction of the inclined portion 8 is preferably in the range of 1/3 to 4/5 of the plate thickness B of the vertical plate member 62.

  This is because when the dimension A exceeds 4/5 of the plate thickness B, the dimension C in the axle direction of the non-inclined portion 9 becomes 1/5 or less of the plate thickness B. This is because the outer side is sharp and it is difficult to ensure dimensional accuracy from the vehicle width direction outer side to the upper end of the lower end of the vertical plate member 62. Further, when the dimension A is less than 1/3 of the plate thickness B, the dimension C in the axle direction of the non-inclined portion 9 becomes 2/3 or more of the plate thickness B, which is close to the type shown in FIG. This is because 7 tends to occur.

  On the other hand, if the dimension A is 1/3 or more of the plate thickness B, the dimension C in the axle direction of the non-inclined portion 9 is 2/3 or less of the plate thickness B, so that the penetration depth D of fillet welding is a plate. Even if it is about half the thickness B, the horizontal length E of the unwelded portion in the non-inclined portion 9 is 1/6 of the plate thickness B by (2/3) − (1/2) = 1/6. It becomes as follows. If the inclination angle θ of the inclined portion 8 is within 30 degrees, the gap F in the vertical direction of the unwelded portion in the non-inclined portion 9 is (1/6) × (1 / √3) = about 1/10. Therefore, the thickness is about 1/10 or less of the plate thickness B, and is suppressed to an acceptable level as the welding defect 7.

  A modified embodiment of the present invention is shown in FIGS.

  In the previous embodiment, the bracket 6 is welded to the center bulge portion 3 of the axle case 1 so that the lower ends of the left and right vertical plate members 62 are in contact with the central bulge portion 3 obliquely. Although the inclined portions 8 are formed at the lower ends of the left and right vertical plate members 62, in this modified embodiment, the bracket 60 is moved from the center of the central bulge portion 3 of the axle case 1 in the vehicle width direction as shown in FIG. It is shifted and welded to the central bulge 3.

  In this case, in FIGS. 8 and 9, the lower end 62r of the right vertical plate member 62 is substantially orthogonal to the upper surface of the central bulge portion 3, and therefore, when the inclination angle θ is as small as less than 15 degrees. The fillet is welded to the central bulge portion 3 without forming the inclined portion 8. On the other hand, the lower end 62l of the left vertical plate member 62 is in a state where it strikes obliquely with respect to the upper surface of the central bulge portion 3, so that if the inclination angle θ is 15 degrees or more, only the lower end 62l of the left vertical plate member 62 is present. Inclined portion 8 is formed and fillet welded to central bulge portion 3.

  In addition to the above, this modified embodiment has the same configuration as the previous embodiment.

  The present invention is not limited to the above embodiments.

  For example, the present invention may be applied to a bracket in which a lower torque rod is attached to the lower portion of the central bulge portion 3. The member attached to the bracket is not limited to the upper torque rod or the lower torque rod, and may be a V rod or the like as long as it is a suspension member connected to the vehicle body frame. In addition, it is applicable also to the welding part structure of the bracket of a structure which abuts a plate end to another inclined surface.

It is a disassembled perspective view which shows the bracket welding structure of the conventional axle case. It is a side view of the bracket of FIG. It is the III-III arrow directional view of FIG. It is explanatory drawing which shows the bracket welding structure of the axle case which the inventor created previously. It is a disassembled perspective view which shows the bracket welding structure of the axle case which concerns on one Embodiment of this invention. It is a side view of the bracket of FIG. It is a VII-VII arrow line view of FIG. It is explanatory drawing which shows the bracket welding structure of the axle case which concerns on the deformation | transformation embodiment of this invention. It is a perspective view of the bracket of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Axle case 3 Center bulging part 6 Bracket 61 Horizontal plate member 62 Vertical plate member 8 Inclined part 9 Non-inclined part 64 Welded part 67 Welded part θ Inclination angle A Axial dimension of inclined part B Thickness of vertical plate member

Claims (3)

A structure in which a bracket to which a suspension member connected to a vehicle body frame is attached is welded to a central bulge portion of an axle case,
The bracket has a horizontal plate member along the axle direction, and a pair of vertical plate members disposed at both ends in the axle direction of the horizontal plate member perpendicular to the axle,
At least one end face of these vertical plate members is formed with an inclined part in which a part of the end face is inclined according to the inclination of the central bulge part, and the remaining part of the end face is a non-inclined part,
Axle characterized in that said vertical plate member and said central bulge portion are fixed by fillet welding in a state where said inclined portion is abutted against said central bulge portion, and said non-inclined portion is spaced from said central bulge portion. Case welded bracket structure.   The bracket welded part structure of an axle case according to claim 1, wherein an inclination angle of the inclined part is within 30 degrees.   The bracket welded part structure of an axle case according to claim 1 or 2, wherein a dimension of the inclined portion in an axle direction is in a range of 1/3 to 4/5 of a plate thickness of the vertical plate member.

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