JP4589775B2 - Suspension rod and manufacturing method thereof - Google Patents

Description

  The present invention relates to a suspension rod in which a bracket is welded to an end portion of a rod member and a method for manufacturing the suspension rod.

  As shown in FIG. 9, a suspension rod used in an automobile suspension device is known in which a bracket 102 is welded to an end portion of a pipe-shaped rod member 101. The suspension bush is attached to the vehicle body side or the wheel side so as to be swingable by assembling the rubber bush 103 in the bracket 102 and inserting the shaft through the rubber bush 103.

  This type of suspension rod receives an axial load mainly due to input from the tire side, and receives a load caused by a torsional moment or a twisting moment generated by a twisting or a twisting of the rubber bush 103 during a suspension stroke. Therefore, as shown in FIG. 9, when the bracket 102 is simply bent into a U shape with the base surface 102a and the pair of fastening surfaces 102b having substantially the same width, the axial load, the torsional moment When receiving a load due to the bending moment, the fastening surface 102b may be deformed or a load may be applied to the welded portion with the rod member 101.

  In order to increase the rigidity of the bracket 102 of the suspension rod, for example, as shown in FIG. 10, the width of the base surface 102a and a part of the fastening surface 102b (base end side) is widened, and the space between the pair of fastening surfaces 102b is increased. There is a structure in which a reinforcing portion 102c that is connected laterally is formed.

  Also, as shown in FIG. 11, the base surface 102a and the pair of fastening surfaces 102b are assumed to be substantially the same width and simply bent into a U shape, and the rigidity is increased by increasing the plate thickness. Is also possible.

  Further, in Patent Document 1, a collar portion is welded and fixed to the end portion of the rod portion, but the welded portion between the collar portion on the vehicle body member side and the rod portion is reinforced with another member. Has been disclosed.

Japanese Utility Model Publication No. 1-173003

  However, in the case shown in FIG. 10, since the shape changing portion 102d is formed at a place where the reinforcing portion 102c continues to the fastening surface 102b, the load due to the axial load, torsional moment, and twisting moment as described above was received. Sometimes, stress tends to concentrate on the shape changing portion 102d.

  Further, in the case shown in FIG. 11, since the plate thickness is increased, the weight is increased, and the rod member 101 is thinner than the plate thickness of the bracket 102, so priority is given to the penetration of the bracket 102 during welding. Then, the rod member 101 is perforated, and if priority is given to the perforation of the rod member 101, there is a risk that the bracket 102 will not be sufficiently melted.

  Furthermore, in any case, since the base surface 102a of the bracket 102 to which the rod member 101 is welded is a wide flat surface, high surface rigidity cannot be ensured, and the axial load, torsional moment and twisting as described above are not possible. When receiving a load due to a moment, a large load may be applied to the welded portion with the rod member 101.

  Moreover, when it reinforces with another member like patent document 1, a weight will increase and the number of parts and an assembly man-hour will increase, and will cause a cost increase.

  The present invention has been made in view of the above points, and it is an object of the present invention to obtain the strength and rigidity necessary for suspension performance without increasing the weight and increasing the cost.

The suspension rod of the present invention is a suspension rod in which a bracket by press molding is welded to an end of a rod member, and the bracket has a multi-stage convex portion by press molding around a welded portion with the rod member. The bracket includes a base surface perpendicular to the rod member, a pair of fastening surfaces facing each other, and a pair of inclined surfaces that connect both ends of the base surface to the fastening surfaces, respectively. The base surface is formed with an uppermost convex portion having an upper surface serving as a welded portion to the rod member among the multi-stage convex portions, and the base surface is formed with the base surface. A lowermost convex portion of the multi-stage convex portions is formed across the surface and the pair of inclined surfaces, and the base surface and the pair of inclined surfaces include the base surface and the pair of inclined surfaces. Curve across the surface In that the flat portion of the strip having a substantially constant width whose serial lead to longitudinal sides of the lower edge of the lowermost convex portion is secured with the features.
A method for manufacturing a suspension rod according to the present invention is a method for manufacturing a suspension rod in which a bracket is welded to an end portion of a rod member, and the uppermost step having an upper surface for welding the rod member to a flat plate by press molding . A step of forming a multi-stage convex part including a convex part and a rectangular or substantially rectangular bottom-most convex part; and the bracket so as to include the multi-stage convex part from the flat plate. cut portion Nasu, a step of securing the flat portion of the strip having a substantially constant width connected to the longitudinal sides of the lower edge of the convex portion of the lowermost At that time, those cut above the lowermost convex welding the steps of the bending to the bracket at least once, the rod member on the upper surface of the uppermost convex portion of the bracket Jo portion and a line across the plane of the strip Characterized in that it comprises a step.

  According to the present invention, since the bracket has a three-dimensional structure in which multi-stage convex portions are integrally formed by press molding around the welded portion with the rod member, the plate is thickened or reinforced with another member. Therefore, the strength and rigidity necessary for the suspension performance can be ensured.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
6 to 8 show the overall configuration of the suspension device according to the embodiment of the present invention. The entire suspension device is supported by the vehicle body 2 via the frame 1. The knuckle unit 4 that rotatably supports the axle 3 is supported by the upper and lower upper arms 5 and the lower arm 6 so as to be swingable with respect to the body 2 side.

  The upper arm 5 has a deformed Y-shape, and is pivotally attached to the frame 1 at two base portions thereof, and pivotally supports the upper portion of the knuckle unit 4 at the tip thereof. Further, the lower arm 6 is swingably attached to the frame 1 side at its base portion, and pivotally supports the lower portion of the knuckle unit 4 at its tip.

  A coil spring 7 and a shock absorber 8 are interposed between the lower arm 6 and the body 2 side, thereby elastically supporting the body 2 and absorbing an impact from the road surface. That is, the upper end sides of the coil spring 7 and the shock absorber 8 are respectively attached to the body 2 side, and the lower end sides thereof are supported by the lower arm 6.

  Further, a control rod 9 is disposed at a position ahead of the lower arm 6 in the vehicle traveling direction (FWD). The control rod 9 is swingably attached to the frame 1 side at its base and is swingably attached to the knuckle unit 4 side at its tip.

  Furthermore, a trailing rod 10 extending from the knuckle unit 4 in the vehicle traveling direction (FWD) is disposed. The trailing rod 10 is swingably attached to the knuckle unit 4 at its base and is swingably attached to the body 2 side at its tip.

  1 and 2 show the entire control rod 9 of the present embodiment. The control rod 9 includes a pipe-shaped rod member 901 having an appropriate length, a bracket 902 welded and fixed to one end of the rod member 901, and a boss 903 welded and fixed to the other end of the rod member 901. The A bracket 904 for inserting and supporting a parking cable (not shown) is welded and fixed at an intermediate position of the rod member 901.

  The rod member 901 has a diameter-enlarged portion 901a that gradually increases in diameter on one end side thereof, that is, on the welded portion side with the bracket 902.

  The boss 903 has a cylindrical shape, and a bush 905 is inserted therein. By inserting the shaft through the bush 905, the control rod 9 is swingably attached to the body 2 side.

  The bracket 902 includes a base surface 906 that is perpendicular to the rod member 901, a pair of fastening surfaces 907 that face each other, and a pair of inclined surfaces 908 that connect both ends of the base surface 906 to each fastening surface 907. The shape of the letter. A through hole 909 is formed in each fastening surface 907, and a nut 910 is welded and fixed to the outside of one fastening surface 907, and a rubber bush 103 (see FIG. 9) is provided between these fastening surfaces 907. The control rod 9 is swingably attached to the knuckle unit 4 side by inserting a shaft through the through hole 909 and the rubber bush 103.

  Here, the bracket 902 is integrally formed with two-stage convex portions 911 and 912 by press molding around the welded portion with the rod member 901.

  The upper surface 911a of the upper step portion 911 of the two-stage convex portions has substantially the same shape and the same size as the end surface of the rod member 901, and the rod member 901 is welded to the upper surface 911a of the upper step portion 911. . That is, the upper step portion 911 protrudes in a circular shape, and its upper surface 911 a has the same circular shape as the end surface of the rod member 901, and has the same diameter as the end surface of the rod member 901 or a slightly larger diameter.

  Further, the lower step portion 912 of the two-step convex portions has a substantially trapezoidal cross section as shown in FIG. 4 and is formed to be curved along the base surface 906 and the pair of inclined surfaces 908. . On both longitudinal sides of the lower step portion 912, the base surface 906 and the pair of inclined surfaces 908 are left as they are, and a strip-shaped flat portion 913 having a substantially constant width is secured. Further, both end surfaces 912a of the lower step portion 912 are just flush with the fastening surface 907.

  In the bracket 902 configured as described above, as shown in FIG. 2, since the base surface 906 and the pair of inclined surfaces 908 remain as they are on both longitudinal sides of the lower step portion 912, the shape changing portion 102d as shown in FIG. It is not formed. In the illustrated example, the shape narrows toward the tip of the fastening surface 907. However, for example, the inclined surface 908 and the fastening surface 907 may have a certain width.

  Next, a manufacturing procedure of the bracket 902 will be described with reference to FIG. First, as shown in FIG. 5 (a), by press molding, the flat plate 914 is positioned at the center of the convex portion 916 having a rectangular shape or a substantially rectangular shape having a narrow width on both short sides, and the convex portion 916. The circular convex portion 915 to be formed is extruded. The convex portion 916 forms the lower step portion 912, and the convex portion 915 forms the upper step portion 911.

  Next, as shown in FIG. 5B, a portion 917 that forms a bracket is cut out from the flat plate 914 so as to include the convex portions 915 and 916. In this case, it cuts out so that the strip | belt-shaped plane part 913 which has a substantially fixed width | variety along the longitudinal both sides of the convex-shaped part 916 may remain. Further, the convex portion 915 is cut out so that the flat surface portion 918 forming the fastening surface 907 remains on both short sides of the convex portion 915.

  Next, as shown in FIG. 5C, the cut 917 is bent to form a base surface 906, a pair of fastening surfaces 907, and a pair of inclined surfaces 908. Here, the short-side end surface 916a of the convex portion 916 is an inclined surface having an appropriate angle, and when bent, these end surfaces 916a become just flush with the fastening surface 907. Yes.

  Then, as shown in FIG. 5D, a through hole 909 is formed in a pair of fastening surfaces 907, and a nut 910 is welded and fixed to the outside of one fastening surface 907, whereby the bracket 902 is completed.

  Thereafter, the rod member 901 is fixed to the upper surface 911a of the upper step portion 911 of the bracket 902 by welding. At the time of welding, it is surely welded so that there is no bead misalignment, cracking, anchor cut, and poor penetration.

  In the control rod 9 described above, the bracket 902 has a three-dimensional structure in which two-stage convex portions 911 and 912 are integrally formed by press molding around the welded portion with the rod member 901, so that the plate thickness is increased. In addition, the strength and rigidity required for the suspension performance can be ensured without reinforcing with another member. Specifically, since the lower step portion 912 is formed so as to be curved along the base surface 906 and the pair of inclined surfaces 908, the load due to the axial load, the torsional moment and the twisting moment as shown in FIG. In any case, high rigidity can be ensured. Moreover, since the upper surface 911a of the upper step portion 911 has the same circular shape as the end surface of the rod member 901 and has the same diameter as the end surface of the rod member 901 or a slightly larger diameter, it is possible to ensure high surface rigidity. Even when a load due to an axial load, a torsional moment or a twisting moment is applied, it is possible to prevent a load from being applied to the welded portion with the rod member 901.

  In addition, since the two-stage convex portions 911 and 912 can ensure the rigidity necessary for the suspension performance, the reinforcing portion 102c that connects the pair of fastening surfaces 102 laterally as shown in FIG. 10 is formed. There is no need. Therefore, for example, as in the present embodiment, the base surface 906 and the pair of inclined surfaces 908 remain as they are on both longitudinal sides of the lower step portion 912, and the inclined surfaces 908 and the fastening surfaces 907 are linear toward the tip of the fastening surface 907. Therefore, it is possible to eliminate a shape changing portion where stress is concentrated.

  In addition, since both end surfaces 912a of the lower step portion 912 are exactly flush with the fastening surface 907, it is possible to eliminate a shape change portion where stress concentrates on the fastening surface 907.

  Furthermore, since the enlarged diameter portion 901a is formed on one end side of the rod member 901, the weld length can be increased without making the rod member 901 thicker than necessary, and the welding strength can be increased.

  As mentioned above, although this invention was demonstrated with various embodiment, this invention is not limited only to these embodiment, A change etc. are possible within the scope of the present invention.

It is a figure which shows the whole control rod of this embodiment. It is a figure which shows the whole control rod of this embodiment. It is the figure seen from the III direction of FIG. It is the IV-IV sectional view taken on the line of FIG. It is a figure for demonstrating the manufacturing procedure of a bracket. It is a perspective view of a suspension device. It is a top view of a suspension apparatus. It is a side view of a suspension apparatus. It is a figure which shows the conventional suspension rod. It is a figure which shows a part of other conventional suspension rod. It is a figure which shows a part of other conventional suspension rod.

Explanation of symbols

DESCRIPTION OF SYMBOLS 9 Control rod 901 Rod member 901a Expanding part 902 Bracket 906 Base surface 907 Fastening surface 908 Inclined surface 911 Upper step part 911a Upper surface 912 Lower step part 912a End surface 913 Plane part

Claims (5)

A suspension rod with a press-molded bracket welded to the end of the rod member,
In the bracket, a multi-stage convex portion is integrally formed by press molding around a welded portion with the rod member ,
The bracket has a substantially U-shape having a base surface perpendicular to the rod member, a pair of fastening surfaces facing each other, and a pair of inclined surfaces respectively connecting both ends of the base surface to the fastening surfaces. ,
The base surface is formed with an uppermost convex portion having an upper surface to be a welded portion with the rod member among the multi-stage convex portions,
The lowermost convex part is formed among the multi-stage convex parts across the base surface and the pair of inclined surfaces,
The base surface and the pair of inclined surfaces have a belt-like plane having a substantially constant width that is connected to the lower edges of both longitudinal sides of the lowermost convex portion that curves over the base surface and the pair of inclined surfaces. Suspension rod characterized in that the part is secured . 2. The suspension rod according to claim 1, wherein an end surface on a short side of the lowermost convex portion is flush with the fastening surface . A method for manufacturing a suspension rod in which a bracket is welded to an end of a rod member,
A multi-stage convex portion including a topmost convex portion having an upper surface for welding the rod member and a rectangular or substantially rectangular bottom convex portion is formed on the flat plate by press molding. Steps,
A portion forming the bracket is cut out from the flat plate so as to include the multi-stage convex portion, and at this time, a belt-like plane portion having a substantially constant width connected to the lower edges on both sides of the longest convex portion. Securing the steps,
Bending the cut out at least once with a line crossing the bottom convex portion and the belt-like plane portion to form the bracket;
Production method of a suspension rod, characterized in that it comprises the step of welding the rod member on the upper surface of the uppermost convex portion of the bracket. In the step of bending the cut portion, a base surface configured to include the uppermost convex portion, the lowermost convex portion, and the belt-like plane portion, and a pair of fastening surfaces facing each other, A bracket having a substantially U-shape having a pair of inclined surfaces including the lowermost convex portion and the belt-like plane portion, each of which connects both ends of the base surface to the respective fastening surfaces; The method of manufacturing a suspension rod according to claim 3. 5. The method of manufacturing a suspension rod according to claim 4, wherein, in the step of bending the cut portion, an end surface on a short side of the lowermost convex portion is flush with the fastening surface.

Images