JP6116454B2 - Torque rod bracket - Google Patents

Description

  The present invention relates to a torque rod bracket that is press-fitted into an axle case and welded to a side surface of the axle case.

  As shown in FIG. 6 (a), a corner section 20 of a rectangular cross section of the axle case 9 is used as a mounting structure in which a torque rod bracket formed in a V shape is press-fitted to an axle case having a rectangular cross section. There is a structure in which the inner surface 41 of the torque rod bracket 40 is crimped. According to such a structure, the lateral load F can be shared by the corner portion 20, the stress generated in the welded portion 42 can be reduced, and a press-fit effect can be obtained. However, since the axle case 9 is formed by joining a plurality of members formed in a complicated shape by pressing or the like, the shape is likely to vary, and the corner portion 20 has an inner side of the torque rod bracket 40. In the structure in which the surface 41 is in close contact, the vertical dimension (height dimension from the center c of the axle case 9 to the torque rod coupling part t) L for aligning the torque rod bracket 40 at a predetermined position is difficult to be obtained. was there. Further, when the torque rod bracket 40 is press-fitted into the axle case 9 so that the dimension L in the vertical direction is obtained, the torque rod bracket 40 expands or narrows in the width direction depending on the size of the rectangular cross-section width B of the axle case 9, so that torque The gap g formed between the V-shaped open end 43 of the rod bracket 40 and the axle case 9 is also large and there is a problem that the welding aim cannot be specified and welding becomes unstable.

Japanese Utility Model Publication No. 2-110509

  As an attachment structure for solving these problems, as shown in FIG. 6 (b), the open end 46 of the torque rod bracket 45 is crimped to the side surface 9 a of the axle case 9 and the torque rod from the corner portion 20 of the axle case 9 is used. There is a structure in which the bracket 45 is separated. With this structure, the gap g between the axle case 9 and the open end 46 can be minimized, and welding can be stabilized. However, since the portion (open end 46) pressed against the axle case 9 is melted, there is a problem that the press-fitting is released and the press-fitting effect is reduced.

  An object of the present invention is to provide a torque rod bracket that can be stably and easily welded to an axle case and can maintain a pressure input even after welding.

  In order to achieve the above-mentioned object, the torque rod bracket of the present invention is formed by joining a pair of bracket plates in a V shape, and the joint side end is connected to the torque rod, and the V shaped open end. In a torque rod bracket that is press-fitted into an axle case having a rectangular cross section and is welded to a side surface of the axle case, the open end sides of the pair of bracket plates are positioned on both side surfaces of the axle case. Formed between the flat plate portion and a bent portion bent outward from the flat plate portion via the inflection portion, the interval between the inflection portions is formed narrower than the rectangular cross-sectional width of the axle case, Further, the flat plate portions on both sides are expanded and press-fitted into the predetermined position, the inflection portion presses the side surface of the axle case, and the bent portion extends from the press-fitting side corner portion of the axle case. And it is formed so as to between.

  The bracket plate is formed so that the flat plate portion, the inflection portion, the bending portion, the inclined portion, and the overlapping portion are continuous from the open end side to the torque rod coupling portion. The overlapping portion and the inclined portion may be joined via a rib.

  The flat plate portion may be formed so that the open end is close to the side surface of the axle case when the inflection portion presses the side surface of the axle case.

  According to the torque rod bracket of the present invention, it is possible to stably and easily weld to the axle case and to maintain the pressure input after welding.

It is a side view of the torque rod bracket which concerns on one embodiment of this invention. It is a side view of the torque rod bracket before attaching to an axle case. It is a perspective view of the torque rod bracket attached to the axle case. It is a perspective view of an axle case, (a) shows the state attached to the rear front axle case, (b) shows the state attached to the rear rear axle case. It is a perspective explanatory view of a torque rod bracket applied to a suspension of a large vehicle. (A) is a side view of the conventional torque rod bracket, (b) is a side view of the conventional improved torque rod bracket.

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

  FIG. 5 is a perspective view showing an example in which the torque rod bracket is applied to a trunnion suspension.

  As shown in FIG. 5, the trunnion suspension 1 includes a trunnion bracket 4 provided on each side member 3 of the chassis frame 2, a trunnion shaft 5 provided between the trunnion brackets 4, and a trunnion shaft 5. A rear spring axle case 8 and a rear rear axle case 9 engaged with leaf springs 6 on both sides in the vehicle width direction via spring guides 7, and a rear front axle case. 8 and a rear rear axle case 9 are supported in the front-rear direction, and are provided with an upper link mechanism 10 and a lower link mechanism 11 that are supported so as to swing up and down.

  As shown in FIG. 4, the rear front axle case 8 and the rear rear axle case 9 are composed of lower half portions 12 and 13 formed in a U-shaped cross section and upper half portions 14 and 15 formed in an inverted U-shaped cross section. And body portions 16 and 17 formed by joining the two. The main body portions 16 and 17 are formed in a long shape, and axle tubes 18 and 19 for supporting the wheels are joined to both ends. The main body portions 16 and 17 are formed in a substantially rectangular cross section. The corner portions 20 of the main body portions 16 and 17 are formed in an arc shape.

  As shown in FIG. 5, the upper link mechanism 10 includes a torque rod bracket 21 that protrudes upward from the rear front axle case 8 and the rear rear axle case 9, and an upper end portion of the torque rod bracket 21 that can be pivoted up and down. A torque rod 23 connected to the bracket 22 attached to the cross member of the chassis frame 2 so as to be rotatable up and down is provided.

  The lower link mechanism 11 is connected to a torque rod bracket 24 projecting downward from the rear front axle case 8 and the rear rear axle case 9 and a lower end portion of the torque rod bracket 24 so as to be vertically rotatable and the trunnion bracket 4. And a torque rod 25 that is pivotably connected to the top and bottom.

  Hereinafter, the torque rod bracket 24 attached to the rear rear axle case 9 will be described. The torque rod bracket 24 to be attached to the rear front axle case 8 has the same mounting structure and will not be described.

  As shown in FIG. 2, the torque rod bracket 24 before being press-fitted into the axle case 9 is formed by joining a pair of bracket plates 26 in a V shape.

  In the bracket plate 26, the flat plate portion 32, the inflection portion 36, the bending portion 33, the inclined portion 34, and the overlapping portion 35 are continuous from the V-shaped open end 30 side to the torque rod coupling portion t. Formed.

  The flat plate portions 32 are formed so as to be parallel to each other. The flat plate portions 32 are positioned on both side surfaces of the axle case 9 when the torque rod bracket 24 is press-fitted into the axle case 9. The flat plate portion 32 separates the bent portion 33 from the open end 30. The bent portion 33 is formed on the open end 30 side of the bracket plate 26 and is bent so as to widen the space between the bracket plates 26. The bent portion 33 is bent so as not to contact the corner portion 20 of the axle case 9. The inflection portion 36 connects the bent portion 33 and the flat plate portion 32 in an arc shape. The inflection portion 36 is bent in the direction opposite to the bent portion 33. The interval W between the inflection portions 36 of both bracket plates 26 is formed to be narrower than the rectangular cross-sectional width (dimension in the vehicle traveling direction) B of the axle case 9. The inclined portion 34 is inclined so that the overlapping portion 35 sides are close to each other. The overlapping portions 35 are formed so as to overlap each other.

  The bracket plate 26 is joined via the rib 31. Specifically, the rib 31 joins the overlapping portions 35 to each other and joins the inclined portions 34 to each other. The rib 31 is formed so as not to come into contact with the axle case 9 when the torque rod bracket 24 is press-fitted into the axle case 9. The rib 31 expresses the pressure input P when the axle case is press-fitted by joining the bracket plates 26 together.

  As shown in FIG. 3, the bracket plate 26 is formed in a substantially trapezoidal shape when viewed from the front. An overlap portion 35 is formed on the short side of the bracket plate 26. The joining portion 27 is formed by bringing the overlapping portions 35 close to each other and joining them. Further, on the short side of the bracket plate 26, a mounting hole 28 for attaching a spindle (not shown) for the torque rod is formed so as to be spaced apart in the extending direction of the short side and interfere with the torque rod. A cutout 29 for avoidance is formed between the mounting holes 28. As a result, the end of the torque rod bracket 24 on the joint 27 side is connected to the torque rod. An open end 30 is formed on the long side of the bracket plate 26. The open end 30 is welded to the side surface 9 a of the axle case 9. Further, at both ends of the long side of the bracket plate 26, raised portions 39 are formed that protrude in a trapezoidal height direction. The raised portion 39 prevents the weld metal from dripping from both ends of the long side when the long side of the bracket plate 26 and the side surface 9a of the axle case 9 are welded.

  Next, the operation of the present embodiment and the torque rod bracket 24 press-fitted into the axle case 9 will be described.

  As shown in FIGS. 1 and 3, when the torque rod bracket 24 is press-fitted into the axle case 9, the open end 30 of the torque rod bracket 24 is pressed against the corners 20 at both ends of the lower side of the axle case 9. At this time, the pair of open ends 30 move along the curved surface shape of the corner portion 20, and the bent portion 33 is deformed to widen the space between the open ends 30. Thereby, the flat plate portion 32 of each bracket plate 26 is inclined by a minute angle, and the inflection portion 36 comes into contact with the axle case 9 side. That is, the flat plate portion 32 is inclined so that the open end 30 is not so far away from the side surface 9a of the axle case 9 when the inflection portion 36 presses the axle case side surface 9a.

  When the torque rod bracket 24 is further pushed into the axle case 9, the open end 30 is separated from the corner portion 20 of the axle case 9, and each inflection portion 36 presses the side surface 9 a of the axle case 9. That is, since the dimension W between the open ends 30 is smaller than the rectangular cross-sectional width B of the axle case 9, a force for pressing the axle case 9 and a pressure input P are generated at the inflection portion 36.

  Thereafter, the vertical dimension (dimension for aligning the torque rod bracket 24 at a predetermined position) L from the center c of the axle case 9 to the position of the mounting hole 28 (torque rod coupling portion t) is a predetermined value. The position of the torque rod bracket 24 is adjusted so that At this time, since the bent portion 33 is formed sufficiently large, even if the shape of the axle case 9 varies, the bent portion 33 does not come into contact with the corner portion 20, and the torque rod bracket 24 can be easily moved to a predetermined position. Can be positioned.

  When the torque rod bracket is positioned, the open end 30 of the torque rod bracket 24 and the side surface 9a of the axle case 9 are welded. The conventional structure shown in FIG. 6A is formed between the open end 43 of the torque rod bracket 40 and the axle case 9 by changing the contact point of the corner 20 depending on the size of the rectangular cross section of the axle case 9. However, the torque rod bracket 24 according to the present embodiment is in contact with the axle case 9 at the inflection portion 36. Therefore, the opening of the bracket plate 26 (flat plate portion 32) above the inflection portion 36 is substantially constant. For this reason, the gap g between the open end 30 and the axle case 9 is also substantially constant, the welding aim is not likely to be shifted, and welding is stabilized.

  Further, since the inflection portion 36 that pushes the axle case 9 is separated from the open end 30 welded to the axle case 9, it does not melt as in the structure shown in FIG. The torque rod bracket 24 can maintain the sufficient pressure input P even after welding.

  When a load F is applied to the torque rod coupling portion t of the torque rod bracket 24, forces f1 and f2 in the same direction as the load F are generated in the inflection portions 36, respectively. With respect to these forces f1 and f2, the pressure input P acts as a load in the opposite direction and suppresses the movement of the torque rod bracket 24 itself, so that an effect of reducing the load received by the welded portion 38 is obtained.

  In this way, the open end 30 side of the pair of bracket plates 26 is a flat plate portion 32 positioned on both side surfaces of the axle case 9 and a bent portion 33 bent outward from the flat plate portion 32 via the inflection portion 36. The space W between the inflection portions 36 is formed to be narrower than the rectangular cross-sectional width B of the axle case 9, and the flat plate portions 32 on both sides are widened and press-fitted into a predetermined position. Since the axle case side surface 9 a is pressed and the bent portion 33 is formed so as to be separated from the press-fit side corner portion 20 of the axle case 9, the press-fit side corner portion 20 of the axle case 9 is formed on the torque rod bracket 24. Positioning can be prevented and the gap between the axle case 9 and the open end 30 can be made constant, and the torque rod bracket 24 can be stably and easily placed at a predetermined position of the axle case 9. It can be welded. And since the inflection part 36 spaced apart from the open end 30 which should be welded presses the axle case 9, the inflection part 36 does not melt | dissolve and the pressure input P can be maintained after welding.

  The bracket plate 26 is formed so that the flat plate portion 32, the inflection portion 36, the bending portion 33, the inclined portion 34, and the overlapping portion 35 are continuous from the open end 30 side to the torque rod coupling portion t. In addition, since the overlapping portion 35 and the inclined portion 34 of both bracket plates 26 are joined via the ribs 31, the pressure input P can be increased.

  Further, since the flat plate portion 32 is formed so that the open end 30 is close to the side surface 9a of the axle case 9 when the inflection portion 36 presses the axle case side surface 9a, the open end 30 and the axle case 9 It is possible to prevent the welded portion from reaching the inflection portion 36 when welding.

  Further, a stress contour diagram when the input F is applied to the torque rod bracket 24 according to the present embodiment and a torque rod bracket (not shown) having no pressure input by the finite element method is created, and the weld 38 is obtained. The stress of was analyzed.

  When the index of stress generated in the torque rod bracket without pressure input is 100, the torque rod bracket 24 according to the present embodiment has an index of stress generated in the welded portion 38 on the input F side (left side in FIG. 1). 52, and the index of stress generated in the weld 38 on the opposite side was 23. That is, it was confirmed that the stress generated by the torque rod bracket 24 according to the present embodiment is smaller and the press-fitting effect is obtained.

9 Axle case 9a Side surface 20 Corner portion 24 Torque rod bracket 26 Bracket plate 27 Joint portion 30 Open end 31 Rib 32 Flat plate portion 33 Bending portion 34 Inclining portion 35 Overlapping portion 36 Inflection portion t Torque rod coupling portion B Rectangular cross-sectional width W Variable Song spacing

Claims (3)

It is formed by joining a pair of bracket plates in a V shape, the end on the joint side is connected to the torque rod, and the V shaped open end is press-fitted into an axle case having a rectangular cross-section in a predetermined position. And torque rod brackets welded to the side of the axle case
The open end side of the pair of bracket plates is formed with a flat plate portion located on both side surfaces of the axle case, and a bent portion bent outward from the flat plate portion via an inflection portion, An interval between the inflection portions is formed narrower than a rectangular cross-sectional width of the axle case, and the flat plate portions on both sides are widened and press-fitted into the predetermined position, and the inflection portion presses the side of the axle case, and A torque rod bracket, wherein the bent portion is formed so as to be separated from a press-fitting side corner of the axle case.   The bracket plate is formed so that the flat plate portion, the inflection portion, the bending portion, the inclined portion, and the overlapping portion are continuous from the open end side to the torque rod coupling portion. The torque rod bracket according to claim 1, wherein the overlapping portion and the inclined portion are joined via a rib.   The torque rod bracket according to claim 1 or 2, wherein the flat plate portion is formed so that the open end is close to a side surface of the axle case when the inflection portion presses the side surface of the axle case.

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