KR0138984B1 - Frame for a truck - Google Patents

Abstract

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Description

Undercarriage frame with carrier

1 is a plan view (left side of the center plane 0-0) and a bottom view (right side of the center plane 0-0) showing the first embodiment of the present invention.

2 is a perspective view of the cross member 12 in FIG. 1 taken out and displayed;

3 is a partial cross-sectional view taken along the line III-III of FIG.

4 is a plan view (left side of the center plane 0-0) and a bottom view (right side of the center plane 0-0) showing the second embodiment of the present invention;

5 is a partial cross-sectional view taken along the line VV of FIG.

6 is a partial cross-sectional view similar to FIG. 5 showing a modification of the second embodiment,

7 is a plan view (left side of the center plane 0-0) and a bottom view (right side of the center plane 0-0) showing the third embodiment of the present invention,

8 is a cross-sectional view taken along the line VII-VII of FIG. 7,

FIG. 9 is a cross-sectional view similar to FIG. 8 showing a modification of the cross member 12 in FIG.

10 is a diagram illustrating the equivalent center g of a rivet or bolt group,

FIG. 11 is a conceptual side view showing an aspect of shear force acting on the upper flange and the lower flange of the crossmember when the chassis frame is twisted.

FIG. 12 is a conceptual side view similar to that of FIG. 11 when the carrier frame is twisted.

* Description of the symbols for the main parts of the drawings *

(10): Side rail (12): Cross member

(14): Undercarriage frame 18: Carrier

(20): Fixing means such as U bolt

The present invention relates to a chassis frame of a vehicle provided with a carrier such as a truck.

A typical truck includes a side rail having a cross-sectional shape of a pair of left and right cross sections extending in front and rear directions in a vehicle width direction, and a chassis frame including a plurality of cross members fixed at both ends thereof to the side rails. A carrier is mounted on the chassis frame via an intermediate member such as a vertical thick portion and a subframe, and is secured to the side rail by fixing means such as a U bolt.

In the cross member, a member having a groove-shaped or I-shaped cross-sectional shape is widely used, but in all cases, the upper flange and the lower flange of the cross member have a substantially equivalent shape with respect to the plate thickness and the width of the front and rear bodies. .

When the vehicle is used under severe conditions such as when driving on a bad road where a vehicle such as a truck is severely bumpy, a large torsional load is applied to the chassis frame, and the crossmember has a large stress in the vicinity of the joint with the side rail. It may occur.

Chassis frame 14 in which both ends of the cross member 12 having a cross-sectional shape are grooved by a rivet or bolt to a pair of left and right side rails 10 having a cross-sectional shape as a conceptual side in FIG. ), The torsion test was carried out. In the case of the chassis frame 14 alone, the upper flange 12u and the lower flange 12l of the cross member 12 were respectively indicated by the arrows (su) and (sl) in the drawing. Shear force in the front and rear direction of the vehicle body acts at approximately the same size as indicated, but as shown in the conceptual side view of FIG. 12, the carrier frame is provided on the chassis frame 14 via a new thick portion or subframe 16. 18), the upper flange (12u) as indicated by the arrow Su 'and Sl' in the drawing, when fastened firmly to the side rail 10 by fixing means 20 such as U bolts. See that) The shearing force is much larger vehicle body in the longitudinal direction has been found to act on the lower flange (12l). This test result shows the plate thickness of the upper flange 12u and the lower flange 12l of the cross member 12 and the front and rear of the vehicle body in the conventional truck chassis frame which is provided with the carrier 18 on the chassis frame 14. The conventional crossmember 12 having substantially equal widths in the direction lacks rationality in material distribution, and if the lower flange 12l is required and has sufficient strength, the upper flange 12u is rigidly It is an excess quality, indicating that it was causing a corresponding increase in weight.

In view of the above circumstances, the weight of the cross member is determined by determining the plate thickness of the upper and lower flanges and the width of the body front and rear directions so as to adapt to the difference in the diagnosis force in the front and rear directions acting on the upper and lower flanges of the cross member. Furthermore, the aim is to reduce the weight of the chassis frame.

Zl/Zu

5를 만족하는 형상으로 형성된 것을 특징으로 하는 것이다.Undercarriage chassis frame according to the present invention was created to achieve the above object, a pair of left and right side rails cross-sectional shape is formed in the groove shape and extends in the front and rear direction of the vehicle body, cross-sectional shape is formed in the groove type or I type, the vehicle width direction A chassis frame having cross members fastened to the side rails by means of rivets or bolts, and mounted on the chassis frame, and provided with a carrier clamped securely to the side rails by fixing means such as U bolts. The upper flange and the lower flange in the vicinity of the end portion adjacent to the side rail of the cross member, the thickness of the upper flange and the front and rear body direction tu and bu, the plate thickness of the lower flange and the body front and rear direction When the width of is set to tl and bl and Zu = tub ² u / 6 and Zl = tlb ² l / 6, 1.2

Zl / Zu

It is characterized in that formed in a shape that satisfies 5.

According to the present invention, the upper flange and the lower flange of the crossmember are formed in a shape that satisfies the above expression, and the upper flange and the lower flange are formed in a light weight. Therefore, it is possible to remove the excess weight of the upper flange after the lower flange secures necessary and sufficient plate thickness and width in the front and rear directions of the vehicle body.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 9. First, in the first embodiment of the present invention shown in FIGS. 1 to 3, the chassis frame 14 extends in the front and rear direction of the vehicle body and has a pair of left and right side rails 10 having a cross-sectional shape forming a groove shape. To the grooved gusset 24 secured by a plurality of rivets 22 or substantially the same effect bolts to the wave 10W of the verbiderail, and to the upper flange 24u and the lower flange 24l of the same mushroom. The end portions in the vehicle width direction of the corresponding upper flange 12u and the lower flange 12l are each composed of a cross member 12 of a groove-shaped cross section fastened by a plurality of rivets 26 or bolts having substantially the same effect. It is.

Zl/Zu

5를 만족하도록 상기 위쪽 및 아래쪽 플랜지(12u) 및 (12l)이 형성되어 있다. 제12도의 짐받이 부착차대프레임에 관해 이미 설명한 바와 같이, 차대프레임(14)가 비틀렸을때 크로스멤버(12)의 아래쪽 플랜지(12l)에 작용하는 차체전후방향의 전단력 Sl'는, 위쪽 플랜지(12u)에 작용하는 차체전후방향의 전단력 Sl'보다 크나, 각각의 크기는 차대프레임(14), 그 자체의 비틀림강성, 짐받이(18)의 비틀림강성 및 차대프레임(14) 및 짐받이(18) 상호간의 구속조건에 의해서 여러가지 상이함으로, 상기 Zl/Zu의 값은 상술한 범위내에서 개개의 차량의 특성에 따라 적당히 정해진다. 아래쪽 플랜지(12l)의 Zl=tlb2l/6을 상기 진단력 sl'에 적용하는데 필요하고도 충분한 것으로 하고, 한편 Sl'보다 작은 전단력 Su'가 작용하는 위쪽 플랜지(12u)의 Zu=tub²u/6을 작은 전단력(su')에 균형맞는 값으로 함으로서, 위쪽 플랜지 및 아래쪽 플랜지 강도를 실질적으로 동등하게 한 종래의 구성과 비교해서 크로스멤버(12), 나아가서는 차대프레임(14)의 중량을 경감할 수 있는 이점이 있다. 또한, 상기 Zl/Zu의 값을 1.2 이상으로 한 근거는 1.2 미만에서는 위쪽 및 아래쪽 플랜지의 판두께 및 차체전후방향의 폭이 실질적으로 동등한 종전의 크로스멤버와 비교해서 중량경감의 효과에 작고, 한편 Zl/Zu의 값을 5 이하로 한 것은 실용범위의 여러가지 비틀림강성을 가진 차대프레임(14) 및 짐받이(18)의 조합에 대해서 조사한 결과에 기초한 것이다. Zl/Zu5가 되면, 크로스멤버에 상하방향의 굽힘하중이 작용하였을때, 상하 양플랜지의 굽힘좌굴(座屈) 강도차가 너무 크게 되어, 크로스멤버의 위쪽 플랜지에 필요한 강도를 얻을려고 하면, 아래쪽 플랜지가 크게 되므로 중량이 증대되는 불편이 생겨, 실용성이 부족하게 된다.As indicated in the perspective view of FIG. 2, the plate thickness of the upper flange 12u of the cross member 12 is tu, the width of the front and rear bodies is bu, and the plate thickness of the lower flange 12l is tl, itself. When the width in the front and rear directions is bl and the cross-sectional coefficients in the front and rear directions of the body of the upper flange and the lower flange are Zu = tub ² u / 6 and Zl = tlb ² l / 6, respectively, 1.2

Zl / Zu

The upper and lower flanges 12u and 12l are formed to satisfy five. As already described with respect to the undercarriage undercarriage frame of FIG. 12, when the undercarriage frame 14 is twisted, the shear force Sl 'in the front and rear direction of the vehicle body acting on the lower flange 12l of the cross member 12 is the upper flange 12u. Shear force Sl 'in the front and rear direction acting on the body, but each size is the undercarriage frame 14, its torsional rigidity, the torsional rigidity of the carrier 18 and between the chassis frame 14 and the carrier 18 Due to various differences depending on the constraints, the value of Zl / Zu is appropriately determined according to the characteristics of each vehicle within the above-described range. Zl = tlb2l / 6 of the lower flange 12l is necessary and sufficient to apply to the diagnostic force sl ', while Zu = tub ² u / of the upper flange 12u with a shear force Su' smaller than Sl '. By setting 6 to a value for a small shear force su ', the weight of the crossmember 12 and the undercarriage frame 14 is reduced compared to the conventional configuration in which the upper and lower flange strengths are substantially equal. There is an advantage to this. On the other hand, the basis of the value of Zl / Zu of 1.2 or more is less than 1.2 in the effect of weight reduction compared to the conventional crossmembers whose plate thicknesses of the upper and lower flanges and the width of the front and rear body parts are substantially equal. The value of Zl / Zu of 5 or less is based on the result of the investigation of the combination of the chassis frame 14 and the carrier 18 having various torsional rigidity in the practical range. When Zl / Zu5 is obtained, when the bending force in the vertical direction is applied to the cross member, the bending buckling strength difference between the upper and lower flanges becomes too large, and the lower flange is needed to obtain the strength required for the upper flange of the cross member. Since it becomes large, the inconvenience which weight increases becomes, and practicality becomes inadequate.

In the illustrated embodiment, the upper flanges 12u and 12l are formed with the same plate thickness tu and tl and the width bu and bl over the entire width direction of the cross member 12, but the chassis frame 14 ), The flange width near the front and rear direction center surface 0-0 of the vehicle body can be made smaller than the flange widths bu and bl of the portions adjacent to the side rails 10 to further reduce the weight. That is, as shown in FIG. 2, the rivet 26 or bolt group having the same effect that fastens both ends of the lower flanger 12l of the crossmember 12 to the corresponding lower flange 24l of the gusset 24 The lower flange 12l in the range of 0.2 lg to 0.45 lg from the center plane 0-0 when the distance in the vehicle width direction between the left and right equivalent centers g is lg, with the equivalent center g (described in detail later). the thickness of the plate and a width in the Zl = tlbl ^2/6 with the strength of the disturbance, and the center of the rest may be a smaller width of the flange. This also holds true for the upper flange 12u.

로 했을때, 등가중심 g의 좌표벡터

는, 식

로 표시된다.Here, the meaning of the equivalent center will be described. In FIG. 10, rivets or bolts R1, R2... Ri… The lateral elastic modulus of Rn-1, Rn is G1, G2,. Gi… Gn-1, Gn and the cross-sectional area of each rivet or bolt are respectively a1, a2... ai… an-1, an, coordinate vector of each rivet or bolt

, The coordinate vector of the equivalent center g

Is an expression

Is displayed.

Next, a second embodiment of the present invention shown in FIGS. 4 and 5 will be described. In this embodiment, the upper flange 12u, which is the plate thickness tu of the cross member 12 and the width bu in the front-rear direction of the vehicle body, as in the first embodiment, has a plurality of upper flanges 10u of the corresponding side rails 10. A lower flange 12l fastened by a rivet 26 or a bolt having substantially the same effect, and having a plate thickness tl and a width bl in the front and rear direction of the vehicle body, has a plurality of lower flanges 10l corresponding to the side rails 10. It is fastened by the rivet 26 or the bolt of substantially the same effect.

Zl/Zu

5의 범위로 선택해서, 상기 위쪽 플랜지 및 아래쪽 플랜지에 작용하는 차체전후방향의 전단력 Su' 및 Sl'에 적응시킴으로서 크로스멤버(12)의 강도를 확보하면서 그 중량을 경감하고, 나아가서는 차대프레임(14)의 중량경감을 달성할 수 있다. 또한, 제6도는 홈형단면의 크로스멤버(12)의 위쪽 플랜지(12u) 및 아래쪽 플랜지(12l)의 양단부를 차폭방향으로 연장해서 상하방향으로 접어구부리고, 이 굴곡 플랜지부(12u') 및 (12l')를 복수의 리벳(26) 또는 마찬가지 효과의 볼트에 의해서 사이드레일(10)의 웨브(10W)에 체결한 상기 제2실시예의 변형예로서, 이 경우에도 위쪽 및 아래쪽 플랜지(12u) 및 (12l)에 있어서의 상기 (Zu) 및 (Zl)의 비를 1.2 이상 5 이하의 범위내에서 적당히 선택함으로서, 마찬가지의 중량저감효과를 얻을 수 있다.The first embodiment, like in the upper flange (12u) and bottom flange ^{(12l) Zu = tub 2/} 6 and Zl = tlbl ^2/6 ratio 1.2 with

Zl / Zu

By selecting in the range of 5, by adapting to the shear force Su 'and Sl' in the front and rear directions acting on the upper flange and the lower flange, the weight of the cross member 12 is secured while reducing the weight, and further, the chassis frame ( The weight reduction of 14) can be achieved. 6, both ends of the upper flange 12u and the lower flange 12l of the cross member 12 of the groove-shaped cross-section extend in the vehicle width direction and bend in the vertical direction, and the bent flange portions 12u 'and 12l ') Is a variant of the second embodiment in which the plurality of rivets 26 or bolts of the same effect are fastened to the web 10W of the side rail 10, in which case the upper and lower flanges 12u and ( The same weight reduction effect can be obtained by appropriately selecting the ratio of (Zu) and (Zl) in 12l) within a range of 1.2 or more and 5 or less.

7 and 8 show a third embodiment of the present invention, in which the webs of two grooved members are equally abutted and integrally joined by a plurality of rivets 28 to cross-section. A cross member 12 having a shape I is formed, and both ends of the upper flange 12u and the lower flange 12l of the copper cross member are respectively corresponding to the side rails 10 by a plurality of rivets 26. It is fastened to the upper flange 10u and the lower flange 10l.

The plate thickness of the upper flange 12u of the cross member 12 is tu, the width in the front and rear direction is bu, the plate thickness tl of the lower flange 12l is the width in the front and rear directions, and bl is Zu = tub ² u. By appropriately selecting a ratio Zl / Zu of / 6 and Zl = tlb ² l / 6 in a range of 1.2 or more and 5 or less according to the torsional rigidity of the carrier 18 and the chassis frame 14, the crossmember 12 The weight can be reduced while securing necessary and sufficient strength. Instead of the crossmember 12 shown in FIG. 8, a plate member forming the upper flange 12u as shown in FIG. 9, a plate member forming the lower flange 12l, and a web The cross member 12 of the I-type cross section formed by fixing the plate member forming 12W by welding can be used, and in this case as well, a substantially equivalent effect can be obtained.

In addition, when fixing both ends of the cross member 12 shown in FIG. 8 and FIG. 9 to the side rail 10, the gusset similar to 1st Embodiment can be used, and the cross member 12 of FIG. The upper flange 12u and the lower flange 12l are extended in the vehicle width direction and bent in the same manner as in FIG. 6 to be fixed to the web 10W of the side rail 10 by rivets, or the web 12W of the crossmember 12. ) Is similarly extended in the vehicle width direction, bent in the front and rear direction of the vehicle body to form a mounting flange, and the copper mounting flange can be fixed to the web 10W of the side rail by rivets or the like. And in all these modifications, the weight reduction effect substantially equivalent to the said 3rd Example can be achieved.

In addition, in the second and third embodiments and modifications thereof, the flange widths of the upper flange 12u and the lower flange 12l of the portions that are connected to the side rails 10 of the cross member 12 are also shown. The weight of the cross member 12 can be further reduced by reducing the flange width near the center plane 0-0 with respect to the first embodiment.

Zl/Zu

5를 만족하는 형상으로 형성된 것을 특징으로 하고, 짐받이 부착 차대프레임에 있어서의 크로스멤버의 형상을 작용력에 따른 적절한 형상으로 함으로서 차대프레임의 중량을 저감할 수 있으므로 산업상 유익하다.As described above, according to the present invention, the undercarriage undercarriage frame has a groove shape and a pair of left and right side rails extending in the front-back direction and the cross-sectional shape of the undercarriage are formed in the groove width or I-type and are disposed in the vehicle width direction so that both ends thereof are above. In the chassis comprising a chassis frame having cross members fastened to the side rails by rivets or bolts, and a carrier frame mounted on the chassis frame and secured to the side rails by fastening means such as U bolts. The upper flange and the lower flange near the end adjacent to the side rail of the member are the thickness of the upper flange and the front and rear body direction tu and bu, the thickness of the lower flange and the front and rear body direction tl and to bl, and further when the ^{Zu = tubu 2/6, Zl} = tlbl 2/6, 1.2

Zl / Zu

It is formed in the shape which satisfies 5, and it is advantageous industrially because the weight of a chassis frame can be reduced by making the shape of the cross member in the chassis frame with a carrier into an appropriate shape according to an action force.

Claims (1)

A pair of left and right side rails having a cross-sectional shape in a groove shape and extending in the front and rear directions, and a cross-member in which the cross-section shape is a groove shape or a type I and disposed in the vehicle width direction, and both ends thereof are riveted or bolted to the side rails. And a carrier frame mounted on the chassis frame and secured to the side rail by an anchoring means such as a U bolt, in the vicinity of an end portion adjacent to the side rail of the cross member. The upper and lower flanges of the upper and lower flanges are tu and bu for the thickness of the upper flange and the front and rear body directions, and the thickness of the lower and the front and rear sides of the lower flange are tl and bl, and Zu = tub ² u / 6, 1.2 when Zl = tlb ² l / 6

Zl / Zu

Undercarriage chassis frame, characterized in that formed in a shape that satisfies 5.

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