CN100551729C

CN100551729C - Torque beam suspension

Info

Publication number: CN100551729C
Application number: CNB2007101074869A
Authority: CN
Inventors: 植森康祐; 中村忠能; 井上满; 堀内清志
Original assignee: F TEC Co Ltd; Honda Motor Co Ltd
Current assignee: F TEC Co Ltd; Honda Motor Co Ltd
Priority date: 2002-07-04
Filing date: 2003-07-04
Publication date: 2009-10-21
Anticipated expiration: 2023-07-04
Also published as: JP3944012B2; JP2004034866A; CN101049796A

Abstract

A kind of torque beam suspension, it is at left and right sides trailing arm (10L, 10R) go up the connecting bridge of connection along the opposed end place of the torque beam (11) of the horizontal direction extension of car body, described left and right sides trailing arm (10L, 10R) move to carry out vertical oscillation along the longitudinal direction extension of car body, torque beam (11) has interconnective upper wall (16), the U-shaped cross section of vertical wall (17) and lower wall (18), be formed with bandy bent flanges (16a) at least one of described upper wall (16) and lower wall (18), the direction of this bent flanges (16a) tilts in 40 ° to 60 ° scope with respect to the direction (T) of the perpendicular movement track (C) of torque beam (11).Thus, can reduce the stress on the top that acts on bent flanges (16a), can prevent the crackle of the ora terminalis part of torque beam (11) reliably, and need not to polish or mold pressing.

Description

Torque beam suspension

The present invention is that application number is 03148590.1, the applying date is on July 4th, 2003, denomination of invention is divided an application for the Chinese invention patent application of " torque beam suspension ".

Technical field

The present invention relates to a kind of torque beam suspension, it comprises: left and right sides trailing arm, and they move to carry out vertical oscillation along the longitudinal direction extension of car body; And torque beam, it extends and has the U-shaped cross section along the horizontal direction of car body, and has interconnective upper wall, vertically wall and lower wall, and the connecting bridge at the opposed end place of this torque beam is connected on the trailing arm of the left and right sides.

Background technology

The open No.2000-94917 of Japanese patent application discloses a kind of traditional torque beam suspension.

The opposed end of the torque beam of traditional suspension is connected with vertical centre portion of left and right sides trailing arm, and this torque beam forms has the U-shaped cross section, and open its front surface or rear surface, thereby it is easily owing to torsional deflection appears in difference between the vertical oscillation motion angle of left and right sides trailing arm.When the moment of torsion Liangqi was shaped as the U-shaped with aforesaid opening portion, stress concentrated on the open end edge part especially easily.

With opening portion its is shaped as that torque beam of U-shaped normally forms by punching press, so open end edge partly comprises tangent plane and section.If big stress is in these lip-deep words, then crackle begins from the section edge that especially has unstable apparent order and condition to produce easily.Therefore, generally by polishing with make level and smooth and this edge of rounding of open end edge part, thereby prevent to crack.

The open No.2000-52733 of Japanese patent application discloses a kind of suspension, and wherein for fear of polishing process, this operation can increase the machinework cost, round by the edge of mold pressing with the open end edge part.

But, when the edge being rounded by mold pressing, in order to make the radius of curvature that rounds part stable, importantly make before the mold pressing open end surface portion accurately the location and apparent order and condition is stablized and cooperation at pressing mold in quality control.In order to keep the quality of batch manufacturing workpiece, must give one's full attention to breaking and wearing and tearing of pressing mold, thereby cause the operating cost of these moulds to increase.

Summary of the invention

The objective of the invention is to, need not polish or the situation of mold pressing under prevent from reliably to crack in the ora terminalis part at torque beam, this torque beam has the open section of U-shaped.

In order to realize this purpose, according to the present invention, a kind of torque beam suspension is provided, it comprises: left and right sides trailing arm, they are along the longitudinal direction extension of car body and by hinged being supported on the car body of rubber bush joint that is contained in each trailing arm strut member, so that carry out the vertical oscillation motion; And torque beam, it is a U-shaped along horizontal direction extension and its cross sectional shape of car body, it has interconnective upper wall, vertical wall and lower wall, connecting bridge at the opposed end place of described torque beam is connected with described left and right sides trailing arm, wherein, the U-shaped cross section of described torque beam is along the vertical front side or the rear openings in this U-shaped cross section of car body, and, on at least one of described upper wall and lower wall, form bandy flange, this crooked flange is horizontal along car body, extend to the other end from an end of described torque beam, the direction of the flange of described bending is with respect to the angle tilt of a tangent line with 40 ° to 60 °, described tangent line is the tangent line of the perpendicular movement track of described torque beam, the center of described perpendicular movement track is the axis of described trailing arm strut member, and described tangent line also passes the sweep of the flange of described bending.

By top layout, bandy flange is formed on its cross sectional shape be U-shaped and have interconnective upper wall, vertically at least one in the last lower wall of the torque beam of wall and lower wall, and the direction of these bent flanges is with respect to 40 °-60 ° of the perpendicular movement track inclinations of torque beam.Therefore, can reduce stress on the top that acts on bent flanges.Therefore, can prevent the generation of crackle, and need not the ora terminalis of torque beam is polished or mold pressing, help to reduce the machinework cost thus.

From the following explanation of preferred embodiment and will understand above and other objects of the present invention, feature and advantage in conjunction with the accompanying drawings.

Description of drawings

Fig. 1-10 demonstrates first embodiment of the present invention, wherein:

Fig. 1 is the planar view of whole torque beam suspension;

Fig. 2 is the transparent view of whole torque beam suspension;

Fig. 3 is by the enlarged drawing of parts of 3 expressions in Fig. 1;

The cutaway view that Fig. 4 cuts open for the 4-4 line in Fig. 3;

The cutaway view that Fig. 5 cuts open for the 5-5 line in Fig. 3;

The cutaway view that Fig. 6 cuts open for the 6-6 line in Fig. 3;

The cutaway view that Fig. 7 cuts open for the 7-7 line in Fig. 3;

The cutaway view that Fig. 8 cuts open for the 8-8 line in Fig. 3;

Fig. 9 is the decomposition diagram of trailing arm and torque beam;

Figure 10 demonstrates the torque beam that is in the torsional deflection state;

But Figure 11 is and the similar view according to second embodiment of the invention of Fig. 3;

But Figure 12 is and the similar view according to third embodiment of the invention of Fig. 3;

But Figure 13 is and the similar view according to four embodiment of the invention of Fig. 3;

Figure 14-17 demonstrates the 5th embodiment of the present invention, wherein:

Figure 14 is the planar view of whole torque beam suspension;

The enlarged view that Figure 15 sees for arrow 15 directions in Figure 14;

The amplification view of Figure 16 for cutting open along the 16-16 in Figure 14; And

The diagram of curves of Figure 17 for concerning between the angle of bent flanges and the stress.

The specific embodiment

Describe now with reference to Fig. 1-10 pair of first embodiment of the present invention.

As shown in Fig. 1 and 2, the torque beam suspension that is used for automobile back wheel comprise the left and right sides trailing arm 10L that extends along the car body longitudinal direction and 10R and transversely direction extend and make left and right sides trailing arm 10L and the interconnective torque beam 11 of 10R.Cylindrical trailing

arm strut member

12,12 is welded on the front end of trailing

arm

10L and 10R, and is moved to carry out vertical oscillation on car body by the hinged support of rubber bush joint (not shown) that is contained in the trailing arm strut member 12,12.Left and right sides trailing wheel W, W are supported on the

axle

14,14 rotationally, and this is fixed on the

axle bearing plate

13,13 on the outer back end that is welded on trailing arm 10L and 10R.The

spring perch

15,15 that is used for supporting the axle spring lower end is located at the place, the inner at trailing

arm

10L and 10R rear portion.

From Fig. 3-9, as can be seen, be U-shaped at torque beam 11 its cross sectional shapes of front openings, and have interconnective upper wall 16, vertical wall 17 and lower wall 18 along the car body

direction.Connecting bridge

19,19 has the width that vertically increases a little at its opposed end place.Slit 20 at its lateral outer ends place opening is formed in the vertical wall 17, and this vertical wall 17 rises along the perpendicular direction of each connecting bridge 19 of torque beam 11.Last

lower flange

17a and 17b stretch out backward from the last lower edge of slit 20.This slit 20 has circular lateral inner ends, so that reduce stress concentration, thereby has prevented the crackle generation.

Among left and right sides trailing arm 10L and the 10R each is a hollow part, has the first half 21 and the lower part 22 that are welded to each other in their periphery office to one.Basically smooth the first pontes 21a and the second smooth basically connecting bridge 21b are formed on the first half 21, and the 3rd smooth basically connecting bridge 22a and the 4th smooth basically connecting bridge 22b are formed on the lower part 22.

The right connecting bridge 19 of torque beam 11 is connected with right trailing arm 10R in the following ways: the slit in the vertical wall 17 of torque beam 11 is assemblied in above the trailing arm 10R; The outer end of upper wall 16 is welded on the first pontes 21a of the first half 21 at the w2 place; The flange 17a that is positioned at slit 20 tops is welded on the second connecting bridge 21b of the first half 21 at the w3 place; The outer end of lower wall 18 is welded on the 3rd connecting bridge 22a of lower part 22 at the w4 place; And the flange 17b that is positioned at slit 20 belows is welded on the 4th connecting bridge 22b of lower part 22 at the w5 place.

Identical at the structure of torque beam 11 and the part of left trailing arm 10L junction and right connecting bridge 19 with the said structure of the part of right trailing arm 10R junction at torque beam 11.

In having the torque beam suspension of said structure, as the left and right sides trailing arm 10L that is used to support left and right sides wheel W, W and 10R because transverse force during motor turning or inhomogeneous road surface and during with the different angles vertical oscillation, torsional deflection by torque beam 11 produces restoring force, is used for making the angle equilibrium of left and right

sides trailing arm

10L and 10R.

One end opening of

slit

20,20 and being formed on is arranged in the vertical wall 17 of each connecting

bridge

19,19 at opposed end place that the cross section is the torque beam 11 of U-shaped,

slit

20,20 is assemblied in trailing arm 10L and above the 10R, and the last lower flange 17a that stretches out from the last lower edge of

slit

20,20 and the upper wall 16 of 17b and torque beam 11 and the external end edge of lower wall 18 are welded on trailing arm 10L and the 10R at w2 to w5.Therefore, even will reduce in the recruitment of the size of each connecting

bridge

19,19 at the opposed end place of torque beam 11, to reduce material cost and welding cost, also may reduce the rigidity of connecting

bridge

19,19, thereby can carry out elastic deformation by flange 17a and the 17b that forms slit 20,20 or only be formed in the part place of

slit

20,20 by welding at w3 and w5 place.Therefore, but can increase the effective length of torsional deflection of the core of torque beam 11, and reduce the stress that acts on the welding region w2 to w5, thereby guarantee durability.

In addition, because

flange

17a and 17b stretch out forward from the last lower edge of

slit

20,20, so the zone that is welded on w2 and w4 from the external end edge of upper wall 16 and lower wall 18 increases to the fore-and-aft distance that

flange

17a and 17b are welded on the zone at w3 and w5 place, therefore trailing

arm

10L and 10R can form them and be difficult to swing in horizontal surface, thereby have improved the prenex rigidity of suspension.And torque beam 11 and trailing

arm

10L and 10R can be positioned opposite to each other, thereby cause bonding accuracy to improve.

Now with reference to Figure 11 second embodiment of the present invention is described.

In this second embodiment, in the outer end of the upper wall 16 of torque beam 11 and lower wall 18, be formed with otch 16a and the 16b that is shaped as the half elliptic reaming, and the inside circumference of these otch 16a and 16b is welded on w2 and w4 place.This layout needn't be welded the bight a and the b of front and back end of the outer end of upper wall 16 and lower wall 18, and stress concentration appears in bight a and b easily, can prevent that therefore welding from peeling off from bight a and b, thereby improve durability.

Now with reference to Figure 12 the 3rd embodiment of the present invention is described.

In the 3rd embodiment, the opposed end of torque beam 11 by independent parts 11 ', 11 ' form.More particularly, vertically the part of each is cut open at the opposed end place of torque beam 11 in wall 17 and upper wall 16 and the lower wall 18, and with separate part 11 ' fit in the cut-away portions and welding thereon.With the same in first and second embodiments, each separate part 11 ' have slit 20 and flange 17a and 17b.According to the 3rd embodiment, compare by the situation that single parts form with wherein identical shaped torque beam, since the torque beam 11 that has vertical increase width at its opposed end place by separate part 11 ', 11 ' form, so can reduce the needed width of this material, thereby cause material efficiency to improve.

Now with reference to Figure 13 the 4th embodiment of the present invention is described.

Opposite with first to the 3rd embodiment, all do not have spring perch 15 according to the trailing arm 10L of the 4th embodiment torque beam suspension and each among the 10R, and the cross section be the torque beam 11 of U-shaped along the car body direction at rear side place opening.Also with good grounds the 4th embodiment can realize and similar in the first embodiment function and effect.

Describe referring now to Figure 14-17 pair of the 5th embodiment of the present invention.

From Figure 14-16, as can be seen, be formed with the crooked flange 16a that is inclined upwardly at sweep a place at the opening leading edge place of the upper wall 16 of torque beam 11.Torque beam 11 is in vertical motion the axis L that the center that is centered on is a trailing arm strut member 12 under its torsional deflection situation.With the angle [alpha] bending, this tangent line T is on around the circular arc C of axis L and pass sweep a with respect to tangent line T for bent flanges 16a.The structure of other parts of this torque beam suspension is with identical in the first embodiment.

Curve in Figure 17 demonstrates the variation with respect to the variation (referring to axis of abscissa) of the bent angle alpha of the bent flanges 16a of torque beam 11 of the stress located at the interior location (the position i in Figure 16) on the top of external position on the top of bent flanges 16a (the position o in Figure 16) and bent flanges 16a.Position externally, stress increases in bent angle alpha is equal to or less than 20 ° zone; This stress is in 20 °-60 ° the scope constant substantially in bent angle alpha; And stress reduces in bent angle alpha is equal to or greater than 60 ° zone.At interior location i place, stress increases in bent angle alpha is equal to or less than 50 ° zone; This stress is in 50 °-60 ° the scope constant substantially in bent angle alpha; And stress reduces in bent angle alpha is equal to or greater than 60 ° zone.Therefore, if angle of bend is set at 40 °-60 °, then can will externally suppress for being equal to or less than acceptable numerical value, thereby can prevent the generation of crackle reliably, and need not to polish or the top of mold pressing bent flanges 16a with the stress at interior location o and i place.Why can be reduced in the reason of stress of top end of bent flanges 16a as follows by form bent flanges 16a on upper wall 16:

The same as shown in Figure 10, as the left and right sides trailing arm 10L that is used to support left and right sides wheel W, W and 10R during with different angle vertical oscillation, from the front, torque beam 11 bends to S shape, and the part of torque beam 11 (for example representing) vertical curve (speaking by the book) along the direction of the tangent line T that is passed in the sweep a among Figure 16 by reference number A.When the thickness of bent flanges 16a is represented by t, and the height of bent flanges 16a by h represent (＞t) time, if this bent flanges 16a is along the direction bending as the tangent line T of the track of its perpendicular movement, if i.e. α=0, then the section factor Za of this bent flanges 16a equals th ²/ 6, this is a maxim.On the other hand, if the direction of bent flanges 16a is vertical with the direction of tangent line T, if i.e. α=90 °, then the section factor Za of this bent flanges 16a equals ht ²/ 6, this is a minimum value.

The size of the moment M at the part A place in Figure 10 can be considered to constant, and with the orientation independent of bent flanges 16a, therefore, the flexure stress σ=M/Z that acts on the bent flanges 16a depends on section factor Z.Therefore, when section factor Z shows as maxim Za (when α=0 °), flexure stress σ=M/Z shows as minimum value, and when section factor Z shows as minimum value Za (when α=90 °), flexure stress σ=M/Z shows as maxim.

But, because the rubber bush joint is installed in the office, hinged support portion of

trailing arm

10L and 10R, so the actual hunting motion center and the axis L of each among trailing arm 10L and the 10R depart from (referring to Figure 15 and 16), thereby when when the torsional capacity angle [alpha] of the characteristic of rubber bush joint and torque beam 11 is in 40 ° to 60 ° scope, rather than when angle [alpha] equaled 0 °, the stress on bent flanges 16a showed as minimum value.

Though embodiment of the present invention are had been described in detail, it being understood that under the situation that does not break away from the spirit and scope of the present invention that limit in the claims and can make various improvement in design.

For example, flange 16a is formed in the 5th embodiment on the upper wall 16 of torque beam 11, but this bent flanges can be formed on the lower wall 18, perhaps is formed on upper wall 16 and lower wall 18 on both.

In addition, bent flanges 16a can be in Figure 16 the either side of tangent line T tilt, and as long as angle [alpha] is in 40 ° to 60 ° scope, though then this bent flanges along with in Figure 16 by the same opposite sense inclination shown in the dotted line, also can realize identical effect.

In addition, it is opening that torque beam 11 is located in its front side in the 5th embodiment, but can be at its rear side place opening.

Claims

1. torque beam suspension, it comprises: left and right sides trailing arm, they extend and by hinged being supported on the car body of rubber bush joint that is contained in each trailing arm strut member, so that carry out the vertical oscillation motion along the longitudinal direction of car body; And torque beam, it along the horizontal direction of car body extend and its cross section be shaped as U-shaped, this torque beam has interconnective upper wall, vertically wall and lower wall, the connecting bridge at the opposed end place of described torque beam is connected with described left and right sides trailing arm,

Wherein, the U-shaped cross section of described torque beam along car body vertically in the front side or the rear openings in this U-shaped cross section, and,

On at least one of described upper wall and described lower wall, be formed with bandy flange, this crooked flange along car body laterally, extend to the other end from an end of described torque beam, the direction of the flange of described bending is with respect to the angle tilt of a tangent line with 40 ° to 60 °, described tangent line is the tangent line of the perpendicular movement track of described torque beam, the center of described perpendicular movement track is the axis of described trailing arm strut member, and described tangent line also passes the sweep of the flange of described bending.