KR0138985B1 - Undercarriage frame with carrier - Google Patents

Abstract

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Description

Undercarriage frame with carrier

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

2 is a front view showing the gusset 14 in FIG.

3 is a partial cross-sectional view seen in the direction of the arrow along the line III-III of FIG.

4 is a front view of the gusset 14 similar to FIG. 2 showing the second embodiment of the present invention,

5 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,

6 is a cross-sectional view of the cross member 16 in FIG.

FIG. 7 is a cross-sectional view similar to FIG. 6 showing a modification of the cross member 16 in FIG.

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

9 is a conceptual side view showing the sun of shear force acting on the upper flange and the lower flange of the crossmember when the chassis frame unit is twisted;

FIG. 10 is a conceptual view similar to that of FIG. 9 when the carrier frame is twisted.

FIG. 11 is a front view of a gusset showing a conventional arrangement of rivets in which the gussets 14 in FIGS. 9 and 10 are fastened to the side rails 12. FIG.

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

(10)... Chassis frame 12... Side rail

(14)... Gusset 16... Crossmember

(18)... Liner

(20)... Vertical thick section (서브 根 太) or subframe

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

Conventional trucks are provided with a pair of left and right side rails extending in the front and rear direction and having a groove shape in a cross section, and a chassis frame composed of a plurality of cross members each having both ends fixed to the side rails. The carrier is mounted on the chassis frame. The thick part or subframe of the carrier is firmly fastened to the side rail by fixing means such as a U bolt.

A member having a groove-shaped or I-shaped cross-sectional shape is widely used for the cross member, and these cross members are respectively connected to the side rails through gussets at both ends in the vehicle width direction. In addition, the gusset has been widely used that the cross-sectional shape is a groove shape.

Under severe use conditions, such as when a vehicle such as a truck is loaded with cargo and driving on a badly bad road, a torsional load acts on the chassis frame, and an intermediate member for fastening the crossmember to the side rails. Large stresses are generated in the rivets or bolts that secure the gusset and co-locator to the verb rail.

In the conceptual side view of FIG. 9, the chassis frame, collectively indicated by reference numeral 10, is a gusset 14 having a groove shape in the web of the pair of left and right side rails 12 having a groove shape in cross section. Of the cross member 16 of the cross member 16, the web of which is formed by a plurality of rivets or bolts and whose cross-sectional shape is grooved in the upper flange 14u and the lower flange 14L of the co-locating 14. Each of the flanges 16L is of a conventional structure in which a plurality of rivets or bolts are fastened. The torsion test was performed on the undercarriage frame 10. In the case of the undercarriage frame shown in the figure, su and sℓ are shown in the upper flange 16u and the lower flange 16l of the crossmember 16, respectively. Shear force in the front and rear direction of the body of approximately the same size as shown is applied, but as shown in the conceptual side view of FIG. 10 through a vertical thick portion or subframe 18 on the upper surface of the chassis frame 14 When the rack 20 is mounted and secured by fastening means 22 such as a U bolt, the upper flange 16u of the cross member 16 is indicated as su 'and s' at the arrows. It was found that the shear force in the front and rear direction much larger than that of) was applied to the lower flange (16 L). This test result shows that the upper flange 16u and the lower flange 16L of the cross member 16 are shown in FIG. 11 in the conventional truck chassis frame which is provided with the carrier 20 on the chassis frame 14. Tighten the rivets or bolts to the corresponding upper flanges 14u and the lower flanges 14L of the gusset 14 showing the enlarged front view, and further, the webs of the co-locator 14 and the webs of the side rails 12 are fastened. The conventional configuration in which the rivets 24u and 24l (or bolts of the same effect) are arranged in substantially the same pattern above and below the horizontal center line NN of the gusset web lacks structural rationality. When the rivet 24 (or bolt) disposed below the NN has a larger stress than the rivet 24 u (or bolt), and the severe rigging is repeated as described above, the lower rivet 24 (or bolt) is used. And gussets 14 adjacent thereto and There existed a problem that a defect in strength was easy to generate | occur | produce in the web board material of the side rail 12. As shown in FIG.

In view of the above circumstances, by conducting a special study on the arrangement of the rivets or bolts for fastening the gusset webs that couple the end portions of the crossmembers to the side rails to the webs of the verbide rails, the front and rear bodies of the rivets or bolts are formed. It is an object of the present invention to provide a chassis-mounted chassis frame that can improve the durability of the chassis frame by equalizing the shear force and the axial force in the direction, and at the same time achieve weight reduction and reduction in manufacturing cross-section.

In the present specification, with respect to a plurality of rivets or bolts for fastening the web of the gusset to the web of the side rail, the term "equivalent center" has the following meaning. In other words

₁

₂

_i

_n-1

_g

In Fig. 8, rivets or bolts R ₁ , R ₂ ... R _i . The transverse elastic modulus of R _n-1 , R _n is G ₁ , G ₂ . G _i … G _n-1 , G _n Coordinate vector on each rivet or bolt

_One

₂

_i

_n-1

_g

Is displayed.

Undercarriage chassis frame according to the present invention was created in order to achieve the above object, it is installed in the inner side of the pair of left and right side rail and the main rail that extends in the front and rear direction of the vehicle body and forms a groove shape, respectively. And a cross gusset having a groove shape of a cross section secured to the web of the side rail by a plurality of rivets or bolts, and a cross member arranged in a lower width direction and having a groove shape or an I cross section, and having an upper flange of the copper cross member. And both side portions of the lower flange connected to the upper and lower flanges of the gusset by a plurality of rivets or bolts, respectively, and mounted on the chassis frame to be secured to the side rails by fixing means such as U bolts. In the provision provided with a tightly fastened to the end, the web of the gusset From the placement in the upper lateral center line of the rivet or bolt Middle gusset web for fastening the web of the drain one rivet or bolt group dongga center gu a distance to the center line of each rivet or bolt by r _ui and transverse of said gusset webs when from the rivet or bolt in the center of the group dongga g _ℓ disposed below the center line direction of the distance to the center line of each rivet or bolt by r _ℓi,

To satisfy, the rivet or bolt group is characterized in that the excreted.

According to the present invention, a rivet (or bolt) for fastening a web of a gusset and a web of a verbide rail that couples both ends of the cross member to the side rails is disposed so as to satisfy the above expression, so that each of the rivets (or bolts) The generated stress is equalized and the durability of the gusseted fastening part is improved.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 7. First, in the first embodiment of the present invention shown in FIGS. 1 to 3, the chassis frame 10 extends in the front and rear direction of the vehicle body and has a pair of left and right side rails 12 having a cross-sectional shape forming a groove shape. Groove-shaped gussets in which the web 14w is fixed by a plurality of rivets 24u and 24l (or substantially the same effect bolts) arranged in a pattern described later in detail on the web 12w of the verbide rail. 14) and a plurality of rivets 26u and 26l, respectively, for the end portions in the vehicle width direction of the upper flange 16u and the lower flange 16l corresponding to the upper flange 14u and the lower flange 14l, respectively. (Or bolts having the same effect), the cross member 16 of the groove-shaped end surface is provided.

As shown in the enlarged front view of FIG. 2, on the web 14w of the gusset 14, n _u (4 _{u as} one example in this embodiment) are arranged above the horizontal center line NN. Further, n 1 rivets (24 L) are arranged below the center line NN (6 in this example as an example). In general, the rivets 24L and 24u are of the same effective diameter, and the coefficients nu and nL are respectively cross when the chassis frame is twisted, as described above with respect to the undercarriage frame with the carrier in FIG. It is set to apply to the shear forces su 'and s' in the front and rear directions of the vehicle body acting on the upper flange 16u and the lower flange 16l of the member 16.

The distance from the center of gravity of the rivet 24u arranged above the centerline NN to the centerline of each rivet 24u is r _ui , and the distance between the rivets 24L arranged below the centerline NN. when dongga from the center gℓ the distance to the center line of each rivet (24ℓ) as r _ℓi, each rivet group is a food

It is arranged in a pattern to satisfy the. The shear forces su 'and sℓ' acting on the upper flange 16u and the lower flange 16l of the cross member 16 are the torsional rigidity of the chassis frame 10, the torsional rigidity of the carrier 20, and the chassis frame. (10) and the carrier 20 are different from each other depending on the restraint conditions, the sum of the r _ui of the upper rivet (24u) group mainly affected by the shear force su 'and the lower rivet (24ℓ) mainly affected by the shear force sℓ' The ratio α to the sum total of _rLi of the) group is appropriately set within the range of 1.2 to 4 depending on the characteristics of the individual vehicles. The reason why the ratio α is set to 1.2 or more is because the durability of α = 1.1 is small for the conventional structure of α = 1.0, but the durability of twice or more of α = 1.0 can be obtained by setting α = 1.2. The reason why the ratio α is 4 or less is that the ratio of improvement in durability is small and the advantage is small compared to the increase in the number of tightening steps of the rivet (or bolt) when the ratio α is set to 4.

By selecting the ratio α of the total center distance at an appropriate value of 1.2 or more and 4 or less, the strength of each rivet of the upper rivet 24u group and the lower rivet 24L group can be made to be approximately equal and appropriate without excess or deficiency. As a result, there is an advantage that the durability and reliability of the web coupling portion between the gusset 14 and the side rails 12 can be effectively improved, and of course, the same is true when bolts are used instead of rivets. In addition, since the required number of rivets 24u and 24l can be used, the number of rivets can be made smaller than before, so that the number of riveting processes can be reduced, thereby reducing the manufacturing cost. In addition, since a large stress is generated in some of the rivets, there is no inconvenience such as damage of the plate 14 of the gusset web 14w and / or the side rail web 12w adjacent to the rivet, and thus, the reinforcement plate which is often used in the past The omission can be omitted or reduced to a minimum, and there is an advantage in that a reduction in weight and manufacturing cost can be achieved.

FIG. 4 shows the second embodiment of the present invention in which the arrangement pattern of the rivets (or bolts) on the gusset web 14w is changed in the first embodiment. In this embodiment, the width of the web 14w is shown. The rivet 24 L disposed below the center line NN is characterized in that it is disposed in a downwardly convex shape that is substantially symmetrical with respect to the longitudinal center line MM.

The sum total of the distance r _ui from the equivalent center gu of the rivet (24u) group arranged above the horizontal center line NN to the centerline of each rivet, and the equivalent center of the rivet group (24ℓ) arranged below the center line NN. The ratio α to the sum of the distance r _Li from _L to the centerline of each rivet is t-4 as in the first embodiment.

It is appropriately selected according to the characteristics of each vehicle so as to satisfy. This embodiment also achieves equalization of stress generated in each rivet of both rivet groups, thus improving the durability of the joint portion between the gusset 14 and the side rails 12, and also reducing the weight and manufacturing cost. Can be.

5 and 6 show a third embodiment of the present invention. In this embodiment, the webs of two grooved members are brought into contact with each other in a uniform manner and integrally coupled by a plurality of rivets 28 to form a cross-sectional shape. The cross member 16 which forms this I type is formed. The cross-cross member has the upper flange 16u and the lower flange 16L on the upper flange 14u and the lower flange 14L of the corresponding gusset 14, respectively, and the rivets 26u and 26L (or similar effects respectively). Is bolted together). The web 14w of the gusset 14 is formed on the web 12w of the side rail 12 in a pattern similar to that shown in FIG. 2 or FIG. 4 with rivets 24u and 24l (or similar effects). Bolt).

Similar to the first and second embodiments, the sum total of the distance r _ui from the equivalent center gu of the rivet 24u group above the horizontal centerline NN of the gusset web 14W to the centerline of each rivet, and the rivet below the centerline NN (24ℓ) group in the distance ratio α is in the range of less than 1.2 4 sum with r _ℓi from dongga central g _ℓ to the center line of each rivet, moderately due to the torsional rigidity of the chassis frame 10 and the load-carrying platform (20) Is selected. By equalizing the stresses generated in the upper rivet 24u and the lower rivet 24l in correspondence to the shear forces su 'and sl' acting on the upper flange 16u and the lower flange 16l of the crossmember 16, respectively. The same effects as those of the first and second embodiments can be obtained. Instead of the cross member shown in FIG. 6, as shown in FIG. 7, the plate forming the upper flange 16u, the plate forming the lower flange 16L, and the plate forming the web 16W. Can be used the cross member 16 of the I-shaped cross section formed by joining by welding, and in this case, it is substantially equivalent.

As described above, the undercarriage chassis frame according to the present invention has a pair of left and right side rails extending in the front and rear direction of the vehicle body and each having a cross-sectional shape and a grooved rail, and the webs are provided with a plurality of rivets or bolts. And a cross gusset having a groove shape of the cross section secured to the web of the side rail by a groove, and a cross member arranged in the vehicle width direction and having a groove shape or I shape of the cross section, and having both upper and lower flanges of the copper cross member. A chassis frame fastened to the corresponding upper and lower flanges of the gusset by a plurality of rivets or bolts, and a carrier mounted on the chassis frame and fastened to the side rails by fixing means such as U bolts. In the provided, the fastening web of the gusset to the web of the side rail Or bolt wherein the distance from the equivalent center gu of the rivets or bolts group disposed above the lateral center line of the living rods web to the center line of each rivet or bolt by r _ui, and the bottom of the lateral center line of said gusset webs when from the rivet or bolt in the group equivalent to the layout center g _ℓ have the distance to the center line of each rivet or bolt by r _ℓi,

t-5

The rivet or bolt group is disposed so as to satisfy the above, and effectively improves the durability and reliability of the coupling portion between the side rail and the gusset in the undercarriage chassis frame, and at the same time achieve a reduction in weight and manufacturing cost. It can be industrially beneficial.

Claims (1)

A pair of left and right side rails extending in the front and rear direction and each having a cross-sectional shape and a groove shape, and a cross-sectional shape in which the web is mounted inside the verb rail and fixed to the web of the side rail by a plurality of rivets or bolts. And a cross member having a groove shape and a cross member disposed in the vehicle width direction and having a groove shape or an I shape in cross-section, and each of a plurality of rivets or bolts at both ends of an upper flange and a lower flange of the copper cross member. A chassis comprising a chassis frame fastened to a corresponding upper flange and a lower flange, and a carrier mounted on the chassis frame and secured to the side rail by fixing means such as a U bolt, wherein the web of the gusset is provided with a side rail. Of the rivets or bolts on the web of the The distance from the center of gravity of the rivets or bolts arranged to the centerline of each rivet or bolt is rui and each rivet or bolt from the center of gravity of the rivets or bolts arranged below the transverse center of the gusset web. When the distance to the center line of r r i is set to t-6 Undercarriage attachment chassis frame, characterized in that the rivet or bolt group is disposed to satisfy.

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