JP4801034B2 - Anti-vibration connecting rod - Google Patents

Description

  The present invention relates to an anti-vibration connecting rod that can be used as, for example, a torque rod for connecting an automobile engine to a vehicle body while preventing vibration.

An anti-vibration connecting rod called a torque rod is provided between an automobile body and an engine which is a vibration generation source in order to suppress movement and vibration in the roll direction of the engine. Such an anti-vibration connecting rod generally includes a rod body having a cylindrical portion at both ends in the longitudinal direction, and a pair of anti-vibration bushes provided in each cylindrical portion of the rod body with an inner cylinder and a rubber-like elastic portion. And is attached to an engine or a vehicle body using the inner cylinder as an attachment member (see, for example, Patent Document 1 below).
JP 2005-299898 A

  In the vibration proof connecting rod as described above, vibration due to resonance of the rod itself may be a problem. In order to suppress such vibration, it is practical to attach a dynamic damper to the rod body and cancel the resonance of the vibration-isolating connecting rod at the resonance frequency of the damper. In that case, a stay for mounting the damper is provided on the rod body, and the dynamic damper is fixed to the stay. Here, if the rigidity of the stay is low, the frequency characteristic of the dynamic damper alone and the frequency characteristic when the rod is attached vary, and the resonance frequency of the vibration-isolating connecting rod cannot be canceled sufficiently. Therefore, in order to suppress such a frequency shift of the damper, it is required to increase the rigidity of the stay, but the frequency is considered while considering the rod body and stay shape regulation, cost and weight, etc. depending on the positional relationship with the peripheral parts. It is not easy to ensure the stay rigidity that can suppress the deviation.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a vibration-isolating connecting rod that suppresses the frequency deviation of the damper by increasing the rigidity of the stay.

  The anti-vibration connecting rod according to the present invention includes a first tubular portion provided at one end portion in the longitudinal direction, a second tubular portion provided at the other end portion in the longitudinal direction, and the first tubular portion. A rod main body comprising a main body connecting portion for connecting the second cylindrical portion, a first vibration isolation bush provided in the first cylindrical portion, and a second vibration isolation bush provided in the second cylindrical portion. And a vibration-retaining connecting rod provided with a stay for attaching a damper to the main body connecting portion. The main body connecting portion has a substantially U-shaped cross section including a first surface portion to which the stay is fixed and a pair of side surface portions erected from both side edges of the first surface portion. It is formed in a shape that widens so as to protrude from the first tubular part toward the second tubular part on one side in the width direction. Further, the stay includes a main body plate portion that extends across the longitudinal direction of the main body connecting portion and is fixed to the first surface portion, and a reinforcing wall portion that is erected from a side edge portion of the main body plate portion. A first reinforcing wall portion and a second reinforcing wall portion provided on both sides of the main body connecting portion at the side edge portion on the first cylindrical portion side of the main body plate portion. And three reinforcing wall portions provided on the side edge portion of the main body plate portion on the second cylindrical portion side and on the side edge portion on the side opposite to the projecting side of the first surface portion. It consists of And the stay is a pair of edge portions of the first reinforcing wall portion and the second reinforcing wall portion facing each other at the side edge portion of the main body plate portion on the first cylindrical portion side, and the pair of edge portions. While being welded to the main body connecting portion at three sides with the first side edge portion of the main body plate portion sandwiched between, at the side edge portion of the main body plate portion on the second tubular portion side, It welds to the said main body connection part by 2 sides of the edge part of a 3rd reinforcement wall part, and the 2nd side edge part part of the said main body board part connected to this edge part.

  As described above, in the vibration-proof connecting rod, the three reinforcing wall portions are provided on the side edge portion of the stay including the main body plate portion, and the first and second 2 are provided on the one side edge portion of the main body plate portion. Welding to the main body connecting portion at three sides of the two reinforcing wall portions and the first side edge portion therebetween, and at the other side edge portion of the main body plate portion, the third reinforcing wall portion and the second side edge portion Are welded to the main body connecting portion. Therefore, while it is a left-right asymmetric main body connecting portion that spreads from the first cylindrical portion toward the second cylindrical portion toward the one side in the width direction, the above three reinforcing wall portions and a specific welding configuration, The rigidity of the stay can be increased, and therefore the frequency deviation of the damper can be suppressed.

  In the anti-vibration connecting rod, between the first reinforcing wall portion and the first side edge portion, between the second reinforcing wall portion and the first side edge portion, and the third reinforcement. A notch recess may be provided in each side edge between the wall and the second side edge. By providing such a notch recess, when the reinforcing wall portion is erected by bending, the first side edge portion and the second side edge portion are prevented from being deformed, and the side edge portions are flattened. Can be maintained.

  According to the present invention, the rigidity of the stay can be increased by the above three reinforcing wall portions and its unique welding configuration, so that the frequency deviation of the damper is suppressed and the vibration of the vibration-isolating connecting rod is effectively suppressed. be able to.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a torque rod 10 which is an anti-vibration connecting rod according to an embodiment. The torque rod 10 is assembled between the body of an automobile and an engine that is a vibration generation source, and suppresses movement and vibration in the roll direction of the engine.

  The torque rod 10 is provided in the first cylindrical portion 12 with a rod body 16 provided with a first cylindrical portion 12 having a large diameter and a second cylindrical portion 14 having a small diameter at both ends in the longitudinal direction L. The first vibration isolating bush 18 and the second vibration isolating bush 20 provided in the second cylindrical portion 14.

  The rod main body 16 is a metal bracket member including the first cylindrical portion 12, the second cylindrical portion 14, and a main body connecting portion 22 extending in the longitudinal direction L that connects both the cylindrical portions 12 and 14. is there. The first cylindrical portion 12 is fixed to one end 22A of the main body connecting portion 22 by welding 13 (see FIGS. 2 and 3), and the second cylindrical portion 14 is welded to the other end 22B 15 (see FIGS. 2 and 3). It is fixed by. The first cylindrical portion 12 and the second cylindrical portion 14 are cylindrical portions in which both axes O 1 and O 2 are provided substantially perpendicular to the longitudinal direction L of the rod body 16. In addition, planes perpendicular to the respective axes O1 and O2 are provided so as to be orthogonal to each other, whereby the vibration in the roll direction of the engine can be effectively suppressed.

  The first vibration isolating bush 18 is a first outer cylinder 24 press-fitted to the inner peripheral surface of the first cylindrical portion 12, and a first axially parallel and coaxial arrangement in the first cylindrical portion 12. The inner cylinder 26 includes a first rubber-like elastic portion 28 made of a rubber elastic body interposed between the first outer cylinder 24 and the first inner cylinder 26. The first inner cylinder 26 is connected to either the vehicle body or the engine, for example, the engine side.

  The second vibration isolating bush 20 is a second outer cylinder 30 press-fitted to the inner peripheral surface of the second cylindrical portion 14, and a second axially parallel and coaxially arranged in the second cylindrical portion 14. It comprises an inner cylinder 32 and a second rubber-like elastic portion 34 made of a rubber elastic body interposed between the second outer cylinder 30 and the second inner cylinder 32. The second inner cylinder 32 is connected to one of the engines of the vehicle body, for example, the vehicle body side.

  The main body connecting portion 22 of the rod main body 16 is provided with a stay 36 for attaching a damper, and a dynamic damper 40 having a mass body 38 is attached to the stay 36. The dynamic damper 40 includes a mass body 38, a mounting plate 42, and a rubber-like elastic body 44 that couples the mass body 38. The dynamic damper 40 is fixed to the upper surface of the stay 36 by a fixing means 46 such as a rivet via the mounting plate 42. Thus, the vibration generated in the rod main body 16 by the mass body 38 resonating via the rubber-like elastic body 44 is suppressed.

  As shown in FIGS. 2 to 6, the main body connecting portion 22 of the rod main body 16 includes an upper surface portion (corresponding to a first surface portion) 22C to which the stay 36 is fixed by pressing a metal plate, and both sides of the upper surface portion 22C. It is formed in a substantially U-shaped cross section comprising a pair of left and right side portions 22D, 22E that are vertically erected downward from the edge.

  As shown in FIG. 2, the upper surface portion 22 </ b> C is formed in a shape that spreads from the first tubular portion 12 toward the second tubular portion 14 so as to protrude to one side in the width direction W. That is, the upper surface portion 22C has the narrowest width at the end portion 22A on the first cylindrical portion 12 side, and gradually increases in width toward the second cylindrical portion 14 from there. The side surface portion 22D on one side in the width direction W extends in parallel with the longitudinal direction L, while the side surface portion 22E on the other side in the width direction W extends with respect to the longitudinal direction L. It extends to the outside in the width direction W, and is thus formed to have a protruding shape on the other side. Thereby, the area of the welding 15 between the 2nd cylindrical parts 14 is ensured widely, preventing interference with a peripheral component.

  As shown in FIG. 3, the side surface portions 22D and 22E are formed so as to gradually become higher from the second tubular portion 14 toward the first tubular portion 12, thereby the first tubular portion 12. A wide area of the weld 13 is ensured.

  As shown in FIGS. 3 and 4, a reinforcing bracket 48 is provided inside the main body connecting portion 22 so as to span between the pair of side surface portions 22 </ b> D and 22 </ b> E. The reinforcing metal fitting 48 is provided along the lower edge portions of the side surface portions 22D and 22E, and is fixed to the main body connecting portion 22 by welding 50 as shown in FIG.

  As shown in FIGS. 5 to 8, the stay 36 is vertically erected vertically from the main body plate portion 52 that extends across the longitudinal direction L of the main body connecting portion 22 and both side edge portions 52 </ b> A and 52 </ b> B of the main body plate portion 52. And is formed by pressing a metal plate.

  The main body plate portion 52 is an elongated flat plate-like member extending perpendicularly to the longitudinal direction L of the main body connecting portion 22, and is fixed to the upper surface portion 22C at the central portion thereof. Circular attachment holes 56 through which the fixing means 46 are inserted are provided at both end portions in the longitudinal direction M of the main body plate portion 52.

  The reinforcing wall portion 54 includes a first reinforcing wall portion 54A and a second reinforcing wall portion 54B provided on the left and right sides of the main body plate portion 52 on the first cylindrical portion 12 side with the main body connecting portion 22 interposed therebetween. And the third reinforcing wall portion 52C provided on the side edge portion 52B1 on the side opposite to the projecting side of the upper surface portion 22C in the side edge portion 52B on the second cylindrical portion 14 side of the main body plate portion 52. It is comprised by the reinforcement wall part (refer FIG. 7).

  As shown in FIGS. 5 and 6, the reinforcing wall portion 54 is provided along the cross-sectional shape of the side surface portions 22D and 22E of the main body connecting portion 22, and the longitudinal direction M that abuts on the side surface portions 22D and 22E. Is set higher at the center side portion 54X and lower at the end side portion 54Y in the longitudinal direction M (see FIG. 8). The first reinforcing wall portion 54A and the third reinforcing wall portion 54C are provided to face each other in the width direction with the main body plate portion 52 interposed therebetween.

  As shown in FIGS. 5 and 7, the stay 36 has a pair of opposite edges of the first reinforcing wall portion 54 </ b> A and the second reinforcing wall portion 54 </ b> B at the side edge portion 52 </ b> A on the first tubular portion side of the main body plate portion 52. The three parts 54A1 and 54B1 and the first side edge part 52A1 of the main body plate part 52 sandwiched therebetween are welded to the main body connecting part 22. That is, the longitudinal welded portion 58A between the edge portion 54A1 of the first reinforcing wall portion 54A and the side surface portion 22D abutted against the edge portion 54A1, and the side surface abutted against the edge portion 54B1 of the second reinforcing wall portion 54B. Three welds having a U-shape in a side view of a vertical weld 58B between the parts 22E and a lateral weld 58C between the first side part 52A1 and the top part 22C superposed on the first side part 52A1 It is welded with.

  As shown in FIGS. 6 and 7, the stay 36 has a side edge portion 52B on the second cylindrical portion side of the main body plate portion 52, an edge portion 54C1 of the third reinforcing wall portion 54C, and the edge portion 54C1. The main body plate 52 is welded to the main body connecting portion at two sides with the second side edge portion 52B2. That is, between the longitudinal welded portion 60A between the edge portion 54C1 of the third reinforcing wall portion 54C and the side surface portion 22D abutted against the edge portion 54C1, and between the second side surface portion portion 52B2 and the upper surface portion 22C superimposed on this. Are welded at two welded portions that are L-shaped in side view.

  As shown in FIG. 8B, both sides of the first side edge portion 52A1, that is, between the first reinforcing wall portion 54A and the first side edge portion 52A1, and the second reinforcing wall portion 54B and the first side. The side edge portion 52A between the side edge portion 52A1 is provided with a notch recess 62 having a U-shape in plan view. Accordingly, the first side edge portion 52A1 is formed in a tongue-like shape protruding outward in the width direction of the stay 36. Further, a U-shaped notch recess 62 in a plan view is also provided in the side edge portion 52B between the third reinforcing wall portion 54C and the second side edge portion 52B2.

  In the present embodiment configured as described above, the three reinforcing wall portions 54A, 54B, 54C are provided on the side edge portions 52A, 52B of the main body plate portion 52 of the stay 36, and then the above-described specific welded portions 58A-C, Since the stay 36 is welded to the main body connecting portion 22 at 60A-B, the left and right asymmetric main body connecting portion that spreads from the first cylindrical portion 12 toward the second cylindrical portion 14 so as to protrude to one side in the width direction W. However, the rigidity of the stay 36 can be increased. Moreover, with this configuration, the rigidity can be ensured without significant cost increase. Therefore, the rigidity of the stay 36 can be increased at low cost, and the vibration of the torque rod 10 can be suppressed by effectively suppressing the frequency shift of the damper.

  Moreover, since the notch recessed part 62 was provided in the root part of each reinforcement wall part 54A-C, when standing up reinforcement wall part 54A-C by press work, adjacent 1st edge part 52A1 and 2nd side The side edge portions 52A1 and 52B2 can be maintained in a flat shape by preventing the edge portion 52B2 from being deformed (see FIGS. 8A and 8C). Therefore, since these side edge portions 52A1 and 52B2 and the upper surface portion 22C are superposed without any gaps, reliable welding and fixing can be performed.

  The present invention is preferably used as a torque rod of an automobile, but can be applied as various anti-vibration connecting rods such as a stabilizer link rod and a suspension rod in addition to the torque rod.

Side view of vibration proof connecting rod according to embodiment Plan view of the rod body of the anti-vibration connecting rod Side view of the rod body Bottom view of the rod body VV sectional view of FIG. Sectional view taken along line VI-VI in FIG. Main part enlarged plan view of the rod body (A) is a front view of a stay attached to the rod body, (b) is a bottom view, and (c) is a side view.

Explanation of symbols

10 ... Torque rod (anti-vibration connecting rod)
DESCRIPTION OF SYMBOLS 12 ... 1st cylindrical part 14 ... 2nd cylindrical part 16 ... Rod main body 18 ... 1st anti-vibration bush 20 ... 2nd anti-vibration bush 22 ... Main body connection part, 22A ... One end part, 22B ... Other end part 22C ... Upper surface portion (first surface portion), 22D, 22E, side surface portion 36, stay 52, main body plate portion, 52A, side edge portion on the first cylindrical portion side, 52A1, first side edge portion portion, 52B, second tube. Side edge on the shape part side, 52B1... Side edge on the side opposite to the overhang side, 52B2... Second side edge part 54 .. Reinforcement wall part, 54A... First reinforcement wall part, 54A1. 54B ... second reinforcing wall portion, 54B1 ... second reinforcing wall portion, 54C ... third reinforcing wall portion, 54C1 ... third reinforcing wall portion edge 62 ... notch recess L ... longitudinal direction W … Width direction

Claims (2)

A first cylindrical part provided at one end in the longitudinal direction, a second cylindrical part provided at the other end in the longitudinal direction, and a main body connection for connecting the first cylindrical part and the second cylindrical part. A rod body composed of a part,
A first vibration isolating bush provided in the first tubular portion;
A second anti-vibration bush provided in the second tubular portion;
In a vibration-isolating connecting rod comprising:
A stay for installing a damper is provided in the main body connecting portion,
The main body connecting portion has a substantially U-shaped cross section including a first surface portion to which the stay is fixed and a pair of side surface portions erected from both side edges of the first surface portion. It is formed in a shape that spreads so as to protrude from the first tubular part toward the one side in the width direction toward the second tubular part,
The stay includes a main body plate portion that extends across the longitudinal direction of the main body connecting portion and is fixed to the first surface portion, and a reinforcing wall portion that is erected from a side edge of the main body plate portion. Become
A first reinforcing wall portion and a second reinforcing wall portion provided on both sides of the main body connecting portion at the side edge portion of the main body plate portion on the first cylindrical portion side; and the main body. It is composed of three reinforcing wall portions including a third reinforcing wall portion provided on a side edge portion on the side opposite to the projecting side of the first surface portion at the side edge portion on the second cylindrical portion side of the plate portion,
In the side edge of the main body plate portion on the first cylindrical portion side, the stay is between a pair of opposing edge portions of the first reinforcing wall portion and the second reinforcing wall portion, and between the pair of edge portions. While being welded to the main body connecting portion at three sides with the first side edge portion of the main body plate portion sandwiched, at the side edge portion on the second cylindrical portion side of the main body plate portion, the third side Welded to the main body connecting portion at two sides of the edge of the reinforcing wall portion and the second side edge portion of the main body plate portion connected to the edge,
An anti-vibration connecting rod.   Between the first reinforcing wall portion and the first side edge portion, between the second reinforcing wall portion and the first side edge portion, and between the third reinforcing wall portion and the second side edge. 2. The anti-vibration connecting rod according to claim 1, wherein a notch recess is provided in each side edge between the first and second portions.

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