CN113352837A - Torsion beam type suspension - Google Patents
Torsion beam type suspension Download PDFInfo
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- CN113352837A CN113352837A CN202110233513.7A CN202110233513A CN113352837A CN 113352837 A CN113352837 A CN 113352837A CN 202110233513 A CN202110233513 A CN 202110233513A CN 113352837 A CN113352837 A CN 113352837A
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- 239000000725 suspension Substances 0.000 title claims abstract description 43
- 238000003466 welding Methods 0.000 claims abstract description 158
- 230000002787 reinforcement Effects 0.000 claims abstract description 71
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 239000006096 absorbing agent Substances 0.000 description 6
- 230000003014 reinforcing effect Effects 0.000 description 6
- 230000035939 shock Effects 0.000 description 6
- 238000005553 drilling Methods 0.000 description 5
- 230000002708 enhancing effect Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
- B60G21/02—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected
- B60G21/04—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically
- B60G21/05—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically between wheels on the same axle but on different sides of the vehicle, i.e. the left and right wheel suspensions being interconnected
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
The invention provides a torsion beam type suspension. In a torsion beam type suspension (1), one of a connection wall portion (13) of a torsion beam (10) and a left inner mounting portion (50) of a left reinforcement (30) has a left welding hole (34), the left welding hole (34) is provided with a welding portion for welding them, one of the connection wall portion (13) of the torsion beam (10) and a right reinforcement (130) has a right welding hole (34), the right welding hole (34) is provided with a welding portion for welding them, the connection wall portion (13) has: a 1 st parallel arrangement hole (15) which is arranged on the right side in parallel with respect to the left welding hole (34) and is not provided with a welding part for welding the left reinforcement (30) and the torsion beam (10); and a 2 nd parallel arrangement hole (15) which is arranged on the left side in parallel with respect to the right welding hole and is not provided with a welding part for welding the right reinforcement (130) and the torsion beam (10).
Description
Technical Field
The present invention relates to a torsion beam type suspension, and more particularly to a torsion beam type suspension to be mounted on a vehicle such as a four-wheel automobile.
Background
In recent years, torsion beam type suspensions having a relatively simple structure and excellent space efficiency with a small number of parts are often used for vehicle suspension devices such as four-wheel vehicles, mainly for small displacement vehicles and the like.
Therefore, such a torsion beam type suspension is required to have further increased strength and rigidity while improving productivity thereof and the like.
In this situation, international publication No. 2016/121989 discloses the following structure: in order to reduce stress generated in a joint portion between a torsion beam and a reinforcing member, a welding hole is provided in at least one of the torsion beam and the reinforcing member, and an annular welding portion is formed around the entire periphery of the welding hole as an inner joint portion that is the joint portion with the torsion beam.
However, according to the studies of the present inventors, in the structure of the torsion beam type suspension of international publication No. 2016/121989, for example, when large loads of opposite phases different from each other in the vertical direction are repeatedly applied to the wheel supporting portions of the left and right trailing arms, the degree of stress concentration of the annular welded portion on the torsion beam, which is repeatedly subjected to large torsional deformation, becomes high, and there is room for improvement in the strength and durability of the torsion beam.
Disclosure of Invention
The present invention has been made in view of the above circumstances, and an object thereof is to provide a torsion beam type suspension capable of reducing stress concentration in a welded portion between a torsion beam and a trailing arm and improving strength and durability of the torsion beam while ensuring good productivity, high strength, and the like.
In order to achieve the above object, in the 1 st aspect of the present invention, a torsion beam type suspension has: a left trailing arm that extends in a longitudinal direction of a vehicle body on a left side in a width direction of the vehicle body, and that supports a front end side in the longitudinal direction on the vehicle body and supports a left wheel on a rear end side in the longitudinal direction; a right trailing arm that extends in the longitudinal direction on the right side in the width direction, and that supports the vehicle body at a front end side in the longitudinal direction and supports a right wheel at a rear end side in the longitudinal direction; a torsion beam that has a pair of wall portions extending in the width direction and facing each other in the longitudinal direction, and a connecting wall portion connecting between the pair of wall portions, and that connects the left trailing arm and the right trailing arm; a left reinforcement extending in the width direction on the left side and having a left inner attachment portion attached to the torsion beam in an inner region surrounded by the pair of wall portions and the connecting wall portion of the torsion beam, a left outer attachment portion attached to the left trailing arm, and a left intermediate connecting portion connecting between the left inner attachment portion and the left outer attachment portion, the left reinforcement connecting the torsion beam and the left trailing arm; and a right reinforcement extending in the width direction on the right side and having a right inner mounting portion mounted to an inner wall surface of the torsion beam in the inner region of the torsion beam, a right outer mounting portion mounted to an outer wall surface of the right trailing arm, and a right intermediate connecting portion connecting between the right inner mounting portion and the right outer mounting portion, the right reinforcement connecting the torsion beam and the right trailing arm, wherein one of the connecting wall portion and the left inner mounting portion has a left welding hole in which a welding portion for welding the connecting wall portion and the left inner mounting portion is provided, one of the connecting wall portion and the right inner mounting portion has a right welding hole in which a welding portion for welding the connecting wall portion and the right inner mounting portion is provided, the connecting wall portion has: a 1 st parallel arrangement hole which is arranged on the right side in parallel to the left welding hole and is not provided with a welding part for welding the left reinforcement and the torsion beam; and a 2 nd juxtaposed hole which is juxtaposed to the right welding hole on the left side and is not provided with a welding portion for welding the right reinforcement and the torsion beam.
Further, a 2 nd aspect of the present invention is the 1 st aspect, wherein a hole shape of each of the left connection hole and the 1 st juxtaposed arrangement hole at the juxtaposed portion has a shape defined by a curved line projecting rightward in the width direction, and a hole shape of each of the right connection hole and the 2 nd juxtaposed arrangement hole at the juxtaposed portion has a shape defined by a curved line projecting leftward in the width direction.
Further, according to the 3 rd aspect of the present invention, in addition to the 1 st or 2 nd aspect, the 1 st juxtaposed hole has a hole shape that becomes tapered as going to the right, and the 2 nd juxtaposed hole has a hole shape that becomes tapered as going to the left.
In addition to any one of the aspects 1 to 3, the 4 th aspect of the present invention is characterized in that the connecting wall portion further includes: a 3 rd parallel hole which is provided in parallel to the left side with respect to the left welding hole and in which a welding portion for welding the left reinforcement to the connection wall portion is not provided; and a 4 th parallel hole which is arranged on the right side in parallel to the right welding hole and is not provided with a welding part for welding the right reinforcing piece to the connecting wall part.
In the 5 th aspect of the present invention, in addition to the 4 th aspect, an area of the 1 st parallel hole is larger than an area of the 3 rd parallel hole, and an area of the 2 nd parallel hole is larger than an area of the 4 th parallel hole.
Further, according to the 6 th aspect of the present invention, in addition to the 4 th or 5 th aspect, the hole shape of the 3 rd juxtaposed hole is a shape that becomes tapered as going to the left side, and the hole shape of the 4 th juxtaposed hole is a shape that becomes tapered as going to the right side.
According to the structure of the 1 st aspect of the present invention, one of the connection wall portion of the torsion beam and the left inner mounting portion of the left reinforcement has a left welding hole provided with a welding portion for welding them, one of the connection wall portion of the torsion beam and the right reinforcement has a right welding hole provided with a welding portion for welding them, the connection wall portion has: 1 st juxtaposed holes which are juxtaposed on the right side with respect to the left welding hole and are not provided with welding portions for welding the left reinforcement and the torsion beam; and a 2 nd parallel hole which is arranged on the left side of the right welding hole and is not provided with a welding part for welding the right reinforcement and the torsion beam, thereby ensuring good productivity and high strength, and obtaining stress balance of the welding part between the torsion beam and the reinforcement, reducing stress concentration of the welding part, and improving durability of the torsion beam type suspension.
Further, according to the structure of the 2 nd aspect of the present invention, the hole shapes of the left welding hole and the 1 st juxtaposed setting hole at the juxtaposed portion have the shapes specified by the curved line projecting to the right in the width direction, and the hole shapes of the right welding hole and the 2 nd juxtaposed setting hole at the juxtaposed portion have the shapes specified by the curved line projecting to the left in the width direction, whereby the stress concentration of the welding portion between the torsion beam and the reinforcement can be reduced more reliably.
Further, according to the configuration of the 3 rd aspect of the present invention, the hole shape of the 1 st juxtaposed hole is tapered toward the right, and the hole shape of the 2 nd juxtaposed hole is tapered toward the left, whereby it is possible to reduce stress concentration with respect to the 1 st juxtaposed hole and the 2 nd juxtaposed hole, and to improve durability.
Further, according to the structure of the 4 th aspect of the present invention, the connecting wall portion further has: a 3 rd parallel hole which is arranged on the left side in parallel to the left welding hole and is not provided with a welding part for welding the left reinforcing piece to the connecting wall part; and a 4 th parallel hole which is arranged on the right side of the right welding hole and in which a welding portion for welding the right reinforcement to the connecting wall portion is not provided, whereby the degree of freedom is higher, and stress balance of the welding portion between the torsion beam and the reinforcement, particularly the welding portion on the side of the left and right parallel portions can be obtained.
Further, according to the configuration of the 5 th aspect of the present invention, since the area of the 1 st parallel hole is larger than the area of the 3 rd parallel hole and the area of the 2 nd parallel hole is larger than the area of the 4 th parallel hole, the stress balance of the welded portion between the torsion beam and the reinforcing member, particularly the welded portion on the side of the left and right parallel portions can be more reliably obtained.
Further, according to the configuration of the 6 th aspect of the present invention, the hole shape of the 3 rd juxtaposed hole is tapered toward the left, and the hole shape of the 4 th juxtaposed hole is tapered toward the right, whereby the stress concentration of the welded portion between the torsion beam and the reinforcement, particularly the welded portion on the side of the left and right juxtaposed portions, can be more reliably reduced.
Drawings
Fig. 1 is a partial plan view of a torsion beam type suspension in an embodiment of the present invention.
Fig. 2 is a partial bottom view of the torsion beam type suspension in the present embodiment.
Fig. 3 is a partial rear view of the torsion beam type suspension in the present embodiment.
Fig. 4 is an enlarged sectional view a-a of fig. 1.
Fig. 5 is an enlarged sectional view B-B of fig. 1.
Fig. 6 is an enlarged sectional view of C-C of fig. 1.
Fig. 7 is an enlarged sectional view taken along line D-D of fig. 1.
Fig. 8 is an enlarged cross-sectional view of a torsion beam type suspension in a modification of the present embodiment, and corresponds in position to fig. 6.
Description of the reference symbols
1: a torsion beam type suspension;
10: a torsion beam;
11: a front longitudinal wall portion;
12: a rear longitudinal wall portion;
13: an upper wall portion;
14. 34': a middle hole;
15: an inner side hole;
15 a: an outer shape portion;
15 b: an inner shape portion;
16: an outer aperture;
16 a: an outer shape portion;
16 b: an inner shape portion;
20. 120: a trailing arm;
30. 130, 130: a reinforcement;
31: a bottom wall portion;
32: a front flange;
33: a rear flange;
34. 14': welding the hole;
35: a through hole;
40: an outer mounting portion;
50: an inner mounting portion;
60: an intermediate connecting portion;
80. 180: a spring seat;
81: a bottom wall portion;
82: a convex portion;
83: a through hole;
84: mounting holes;
85: an inclined wall portion;
86: a rear wall portion;
87: a flange;
90. 190: a shock absorber support;
91: a bottom wall portion;
92: a left side wall portion;
93: a right side wall portion;
94: a flange;
95: a flange;
100: a collar member;
110: a wheel supporting member;
s: a closed cross-sectional portion;
g: a gap portion;
b1: a vehicle body mounting section;
s1: a spring mounting portion;
d1: a damper mounting portion;
w1: a wheel-side mounting portion.
Detailed Description
Hereinafter, a torsion beam type suspension according to an embodiment of the present invention will be described in detail with reference to fig. 1 to 5 as appropriate. In the figure, the x-axis, y-axis, and z-axis form a 3-axis rectangular coordinate system. Further, the positive direction of the x-axis is the front of the vehicle body, the positive direction of the y-axis is the left of the vehicle body, and the positive direction of the z-axis is the upper of the vehicle body. In addition, the x-axis direction is sometimes referred to as the longitudinal direction, the y-axis direction is sometimes referred to as the width direction, and the z-axis direction is sometimes referred to as the vertical direction.
Fig. 1 is a partial plan view of a torsion beam type suspension in the present embodiment. Fig. 2 is a partial bottom view of the torsion beam type suspension in the present embodiment. Fig. 3 is a partial rear view of the torsion beam type suspension in the present embodiment. Fig. 4 to 7 are an enlarged sectional view a-a, an enlarged sectional view B-B, an enlarged sectional view C-C, and an enlarged sectional view D-D of fig. 1, in that order. Although fig. 1 to 7 each mainly show the left-side structural element of the torsion beam type suspension, the right-side structural element of the torsion beam type suspension has a structure that is bilaterally symmetrical to the left-side structure. In fig. 1 to 7, for convenience of explanation, representative constituent elements on the right side of the torsion beam type suspension are shown by parenthesized numbers.
First, the overall structure of the torsion beam type suspension 1 in the present embodiment will be described in detail with reference to fig. 1 to 7.
The torsion beam type suspension 1 is mounted on a vehicle body such as a rear side frame of an automobile or the like, not shown, and supports a suspension spring (hereinafter, referred to as a spring), a suspension damper (hereinafter, referred to as a damper), a wheel, and the like.
Specifically, the torsion beam type suspension 1 mainly has a torsion beam 10, a pair of left and right trailing arms 20, 120, and a pair of left and right reinforcements 30, 130. Further, the torsion beam type suspension 1 may also have a pair of left and right spring seats 80, 180 and a pair of left and right shock absorber brackets 90, 190.
Typically, the torsion beam 10 is a plate member made of a metal plate such as a steel plate that is formed into an upwardly convex shape by press forming or the like, extends in the width direction, and has both ends thereof connected to the pair of left and right trailing arms 20, 120.
Specifically, the torsion beam 10 has a front vertical wall portion 11 and a rear vertical wall portion 12 that are opposed to each other in the longitudinal direction, and an upper wall portion (connecting wall portion) 13 that connects upper end portions of the front vertical wall portion 11 and the rear vertical wall portion 12 in the longitudinal direction, in a longitudinal section taken along a plane parallel to the x-z plane, and the torsion beam 10 has an open cross-sectional shape that is open downward. Further, the torsion beam 10 may have an open cross-sectional shape that is open in a direction other than the downward direction, as necessary.
Here, typically, the torsion beam type suspension 1 has a substantially left-right symmetrical shape with respect to a center plane parallel to the x-z plane and passing through the center in the width direction, and therefore, the torsion beams 10 have left-right symmetrical shapes with respect to the center plane. That is, the left and right trailing arms 20 and 120, the left and right reinforcements 30 and 130, the left and right spring seats 80 and 180, and the left and right shock absorber supports 90 and 190 have shapes that are bilaterally symmetrical to each other with respect to the center plane, and are disposed at bilaterally symmetrical positions. For convenience of explanation, the left trailing arm 20, the left reinforcement 30, the left spring seat 80, and the left shock absorber bracket 90 will be representatively explained by taking the left trailing arm 20, the left reinforcement 30, the left spring seat 80, and the left shock absorber bracket 90 as an example, with respect to the pair of left and right trailing arms 20, 120, the pair of left and right reinforcements 30, 130, the pair of left and right spring seats 80, 180, and the pair of left and right shock absorber brackets 90, 190.
Typically, the left trailing arm 20 is a tubular plate member made of a metal plate such as a steel plate having a closed cross-sectional shape, and extends in the longitudinal direction.
Specifically, a collar member 100, typically a metal plate such as a steel plate, which is used for supporting a vehicle body, is welded to a front end portion of the left trailing arm 20 by arc welding or the like, and a wheel supporting member 110, typically a metal plate such as a steel plate, which is used for supporting a wheel, is welded to a rear end portion of the left trailing arm 20 by arc welding or the like such that a part thereof is inserted into the rear end portion of the left trailing arm 20. Further, as necessary, 2 component members each having a longitudinal section substantially in the shape of japanese katakana コ, which are formed by molding a flat plate member made of a metal plate such as a steel plate, may be prepared, and the left trailing arm 20 may be obtained by welding or the like and integrating them by arc welding or the like in a state where they face each other in the width direction, and the left trailing arm 20 may be made of 1 pipe member made of a metal such as a steel pipe. The wheel support member 110 may be welded to the rear end portion of the left trailing arm 20 by arc welding or the like so as to abut only the rear end portion of the left trailing arm 20.
Typically, the left reinforcement 30 is a plate member made of a metal plate such as a steel plate formed by press forming or the like, and is disposed to extend in the width direction between the torsion beam 10 and the left trailing arm 20, and the left end portion and the right end portion thereof are welded to the left trailing arm 20 and the torsion beam 10 by arc welding or the like, respectively, thereby reinforcing them and connecting them to each other.
Specifically, the left reinforcement 30 includes a bottom wall 31 as a main body thereof, a front flange 32 standing upward from a front end of the bottom wall 31, and a rear flange 33 standing upward from a rear end of the bottom wall 31, and the front flange 32 and the rear flange 33 each extend in the width direction together with the bottom wall 31.
The left reinforcement 30 further has an outer attachment portion 40, which is a left end portion welded to the outer wall surface of the left trailing arm 20, outside the left end of the torsion beam 10. The outer attachment portion 40 has respective left end portions of the bottom wall portion 31, the front flange 32, and the rear flange 33, which are molded so as to have a shape along the outer contour shape of the left trailing arm 20, and the respective left end portions are welded to the outer wall surface of the left trailing arm 20 by arc welding or the like so as to be in contact with the outer wall surface of the left trailing arm 20.
The left reinforcement 30 also has an inner attachment portion 50, which is a right end portion welded to the torsion beam 10. The inner attachment portion 50 has a right end portion of the bottom wall portion 31 molded so as to have a shape along the inner wall surface of the upper wall portion 13 of the torsion beam 10, a right end portion of the front flange 32 molded so as to have a shape along the inner wall surface of the front vertical wall 11 of the torsion beam 10, and a right end portion of the rear flange 33 molded so as to have a shape along the inner wall surface of the rear vertical wall 12 of the torsion beam 10.
Preferably, the right end portion of the bottom wall portion 31, the right end portion of the front flange 32, and the right end portion of the rear flange 33 of the left reinforcement 30 constitute a closed cross-sectional portion S that improves the strength and rigidity of the torsion beam 10 in cooperation with the inner wall surface of the torsion beam 10. Further, the right end portion of the front flange 32 and the right end portion of the rear flange 33 can be reduced in vertical length from the viewpoint of improving the formability of the left reinforcement 30, and when the strength of the left reinforcement 30 and the welding strength of the welding of the bottom wall portion 31 and the inner wall surface of the torsion beam 10 can be ensured, the vertical length of each of the right end portion of the front flange 32 and the right end portion of the rear flange 33 can be set to zero to eliminate the front flange 32 and the rear flange 33.
Further, the left reinforcement 30 has an intermediate connecting portion 60 connecting the outer mounting portion 40 and the inner mounting portion 50. The intermediate connecting portion 60 is a diagonal portion that gradually rises from the outer mounting portion 40 toward the inner mounting portion 50 and extends in the width direction. By making the intermediate connection portion 60 adopt such a diagonal portion, it is possible to suppress a rapid shape change in the longitudinal sectional shape in the width direction of the torsion beam 10, and to alleviate stress concentration at a portion where the shape of the torsion beam 10 changes. In addition, from the viewpoint of enhancing the strength and rigidity of the torsion beam 10 and enhancing the joining strength of the torsion beam 10 and the left trailing arm 20, the closed cross-sectional portion S formed by the torsion beam 10 and the left reinforcement 30 in cooperation may be set to reach the outer mounting portion 40 from the inner mounting portion 50 via the intermediate connecting portion 60. Further, in order to weld the left end edge of the torsion beam 10 and the left end edge of the left reinforcement 30 to the left trailing arm 20 without an unnecessary gap, it is more preferable that the torsion beam 10 and the left reinforcement 30 also cooperate to maintain a closed cross-sectional shape at the left end edge.
Here, as an example of the condition for inputting a predetermined load to the torsion beam 10, when vertical loads having mutually different phases in the vertical direction are applied to the parts of the wheel support members 110 of the left and right trailing arms 20, 120 one or more times in a state where the parts of the collar members 100 of the left and right trailing arms 20, 120 are pivotally supported on the vehicle body, the stress concentration degree at the welded portion where the torsion beam 10 and the left reinforcement 30 are welded together is the highest. From the viewpoint of reducing stress concentration at the welded portion, for example, the welded hole 34 (left welded hole in the left reinforcement 30 and right welded hole in the right reinforcement 130) formed by drilling so as to penetrate the bottom wall portion 31 in the vertical direction is provided in the inner attachment portion 50 of the left reinforcement 30. Typically, the welding hole 34 is a circular hole having a circular shape in a plan view, and is disposed at the center of the bottom wall portion 31 in the longitudinal direction. In a state where the upper wall surface of the portion of the bottom wall portion 31 that reaches the peripheral edge of the welding hole 34 and surrounds the periphery of the welding hole 34 is in contact with the inner wall surface (lower wall surface) of the upper wall portion 13 of the torsion beam 10, the bottom wall portion 31 and the upper wall portion 13 exposed to the welding hole 34 are welded together by arc welding or the like along the entire periphery of the peripheral edge of the welding hole 34 or a part thereof, thereby forming a welded portion (not shown). In order to reduce stress concentration in the welded portion, a concave portion recessed downward may be provided in a portion of the upper wall portion 13 facing the weld hole 34, and in this case, it is preferable to provide the intermediate hole 14 so as to penetrate the center of the concave portion in the vertical direction from the viewpoint of drainage or the like. Further, as the welding hole 34, not only a circular round hole but also an oval hole having a major axis in the longitudinal direction, the width direction, or the direction parallel to the direction intersecting with the longitudinal direction, such as an ellipse, may be applied. The welded portion of the weld hole 34 may be formed not only by the hole periphery but also by a plug-welded portion obtained by plug-welding the entire weld hole 34. Further, if necessary, the right end portion of the bottom wall portion 31 of the left reinforcement 30, the right end portion of the front flange 32, and the right end portion of the rear flange 33 may be welded together by arc welding or the like in a state where they are in contact with the inner wall surface of the upper wall 13, the inner wall surface of the front vertical wall 11, and the inner wall surface of the rear vertical wall 12 of the torsion beam 10 corresponding thereto.
Further, from the viewpoint of reducing stress concentration in the welding hole 34 by balancing stress with respect to the welding portion provided in the welding hole 34, it is preferable that the upper wall portion 13 of the torsion beam 10 has an inner hole 15 (a 1 st parallel installation hole for the welding hole of the left reinforcement 30 and a 2 nd parallel installation hole for the welding hole of the right reinforcement 130), the inner hole 15 is provided on the right side in parallel with respect to the welding hole 34, and is formed by drilling so as to penetrate the upper wall portion 13 in the up-down direction, and the welding portion for welding the left reinforcement 30 to the torsion beam 10 is not provided. Typically, the inner side hole 15 has a centroid C2 on a straight line L1 that passes through the centroid C1 of the welding hole 34 and extends in the width direction, having a hole shape that is line-symmetrical with respect to the straight line L1, in a plan view. More specifically, from the viewpoint of ensuring the degree of freedom in obtaining stress balance and reliably reducing stress concentration at the welded portion provided with respect to the welding hole 34, it is preferable that the hole shapes of the parallel portions of the welding hole 34 and the inner hole 15, that is, the hole shape of the right portion of the welding hole 34 and the hole shape of the left portion of the inner hole 15 (outer shape portion) 15a extend so as to intersect the straight line L1 along each other in a plan view, and each have a portion defined by a curve that bulges in the right direction in the width direction. From the viewpoint of simplifying the setting of the hole shapes of the juxtaposed portions of the welding hole 34 and the inner hole 15, the hole shape of the welding hole 34 may be first set to a circular hole, and the hole shape of the outer shape portion 15a of the juxtaposed portion of the inner hole 15 juxtaposed with the welding hole 34 may be defined by a curve having a curvature equal to the curvature of the circular hole shape of the welding hole 34, that is, a concentric circle with respect to the circular hole shape of the welding hole 34. In addition, the hole shape of the outer shape portion 15a of the parallel portion of the inner hole 15 arranged in parallel with the welding hole 34 may be defined by a curve having a curvature smaller than the curvature of the circular hole shape of the welding hole 34 in accordance with the necessity of reducing stress or the like.
From the viewpoint of reliably reducing stress concentration at the welded portion provided to the weld hole 34, the hole shape of the inner shaped portion 15b of the inner hole 15 on the right side opposite to the juxtaposed portion of the weld hole 34 and the inner hole 15 is preferably flattened in the longitudinal direction and tapered toward the right (a shape in which the distance between 2 points on the hole peripheral edge facing in the longitudinal direction gradually decreases). In the inner hole 15, from the viewpoint of drainage and the like, the right end portion of the left reinforcement 30 is preferably disposed inside the inner hole 15, and in this case, a gap portion G is present between the right end portion of the left reinforcement 30 and the inner shape portion 15b of the inner hole 15 in a plan view. The left reinforcement 30 may be provided with a through hole 35 that can be used for positioning or the like, corresponding to the inner hole 15.
Further, in addition to the inner hole 15, from the viewpoint of balancing stress with respect to the welded portion provided to the welding hole 34 and reducing stress concentration at the welding hole 34, it is preferable that the upper wall portion 13 of the torsion beam 10 has an outer hole 16 (a 3 rd parallel installation hole for the welding hole of the left reinforcement 30 and a 4 th parallel installation hole for the welding hole of the right reinforcement 130), the outer hole 16 is provided on the left side in parallel with respect to the welding hole 34, and is formed by drilling so as to penetrate the upper wall portion 13 in the up-down direction, and the welded portion where the left reinforcement 30 is welded to the torsion beam 10 is not provided. Typically, the outer aperture 16 has a centroid C3 on a straight line L1, with an aperture shape that is line symmetric about a straight line L1, when viewed in plan. More specifically, from the viewpoint of ensuring the degree of freedom in obtaining stress balance and reliably reducing stress concentration at the weld portion provided for the weld hole 34, the hole shape of the outer shape portion 16a of the outer hole 16 on the left side opposite to the juxtaposed portion of the weld hole 34 and the outer hole 16 is preferably a shape that is flattened in the longitudinal direction and tapered toward the left direction (a shape in which the distance between 2 points on the hole peripheral edges facing each other in the longitudinal direction gradually decreases). Further, the hole shape of the right-side inner shaped portion 16b, which is the parallel portion of the outer hole 16 arranged in parallel with the weld hole 34, preferably has both the hole shape of the weld hole 34 and the hole shape of the inner hole 15, and has a portion defined by a straight line extending in the longitudinal direction or a curve protruding leftward in the width direction. In addition, when the welding hole 34 is circular in a plan view, the hole shape of the inner shape portion 16b may be defined by a curve having a curvature equal to or larger than the curvature of the hole shape.
In order to easily balance stress with the welded portion provided for the welded hole 34, the area of the inner hole 15 is preferably set larger than the area of the outer hole 16 in a plan view. In addition, from the viewpoint of obtaining a stress balance with the welded portion provided for the welding hole 34 and securing a necessary welding area as described above, the area of the welding hole 34 is preferably set to be smaller than the area of the inner hole 15 and larger than the area of the outer hole 16 in a plan view.
Typically, the left spring seat 80 is a plate member made of a metal plate such as a steel plate formed by press forming or the like, is welded to the torsion beam 10 and the left trailing arm 20 by arc welding or the like, and freely supports the lower end portion of the spring.
Specifically, the left spring seat 80 includes a bottom wall 81 parallel to the x-y plane, a convex portion 82 protruding upward from the center of the bottom wall 81, and a through hole 83 formed by drilling so as to penetrate the convex portion 82 in the vertical direction. The bottom wall 81 may have a single or a plurality of mounting holes 84 formed by vertically drilling the bottom wall 81.
The left spring seat 80 further includes an inclined wall portion 85 that is provided so as to be inclined upward from the front right end portion of the bottom wall portion 81, and a curved rear wall portion 86 that is provided so as to be inclined upward from the rear end portion of the bottom wall portion 81 and that protrudes rearward in a plan view.
In the left spring seat 80, the front end portion of the inclined wall portion 85 is molded so as to have a shape along the outer wall surface of the rear vertical wall 12 of the torsion beam 10. The portion molded in this manner is welded to the outer wall surface of the rear vertical wall 12 by arc welding or the like in a state of being in contact with the outer wall surface of the rear vertical wall 12. From the viewpoint of enhancing the rigidity of the rear vertical wall portion 12 of the torsion beam 10 and enhancing the support strength of the left reinforcement 30 and the left spring seat 80 to the rear vertical wall portion 12, the inclined wall portion 85 is preferably provided in parallel with the left reinforcement 30 across the rear vertical wall portion 12 of the torsion beam 10. The left end of the rear wall 86 is formed to have a shape along the outer wall surface of the left trailing arm 20. The portion molded in this manner is welded to the outer wall surface of the left trailing arm 20 by arc welding or the like so as to be in contact with the outer wall surface of the left trailing arm 20.
The left spring seat 80 also has a flange 87 formed by bending the upper end portions of the inclined wall portion 85 and the rear wall portion 86 outward. When the left spring bearing 80 has sufficient strength for reasons such as a large plate thickness, the flange 87 can be omitted.
Typically, the damper bracket 90 is a plate member made of a metal plate such as a steel plate formed by press forming or the like, is welded to the rear wall portion 86 of the left spring seat 80 by arc welding or the like, and supports the lower end portion of the damper.
Specifically, the damper bracket 90 includes a bottom wall 91 parallel to the x-y plane, and a left side wall 92 and a right side wall 93 that are erected upward from both ends in the width direction of the bottom wall 91 and face each other in the width direction.
In the damper bracket 90, the left side wall portion 92 and the right side wall portion 93 extend below the lower surface of the bottom wall portion 81 of the left spring seat 80, and are welded thereto by arc welding or the like. Although not shown, the left and right side walls 92 and 93 are respectively formed with a left through hole and a right through hole that are formed by punching the lower end portions of the dampers in the width direction and are supportably received therebetween, respectively. A nut member, not shown, may be provided in one of the through holes.
The damper bracket 90 further includes a flange 94 formed by bending the upper end portion of the left side wall portion 92 in the left direction, and a flange 95 formed by bending the upper end portion of the right side wall portion 93 in the right direction. The left end portion of the flange 94 is welded to the outer wall surface of the left trailing arm 20 by arc welding or the like in a state of being in contact with the outer wall surface of the left trailing arm 20, and the front end portion of the flange 94 is welded to the rear wall portion 86 of the left spring seat 80 by arc welding or the like in a state of being in contact with the rear wall portion 86 of the left spring seat 80. The front end portion of the flange 95 is welded to the rear wall portion 86 of the left spring seat 80 by arc welding or the like in a state of being in contact with the rear wall portion 86 of the left spring seat 80.
In the torsion beam type suspension 1 having the above configuration, the vehicle body mounting portion B1 is set as a portion to be mounted on the vehicle body, and the wheel-side mounting portion W1 for mounting the wheel-side member, the spring mounting portion S1 for mounting the spring, and the damper mounting portion D1 for mounting the damper are set as mounting portions for mounting various external force applying members.
Specifically, the vehicle body attachment portion B1 is disposed to correspond to the collar member 100 provided at the front end portion of the left trailing arm 20. In the vehicle body mounting portion B1, the front end portion of the left trailing arm 20 is pivotally supported and mounted to the vehicle body by being fastened by a fastening member such as a bolt, which is not shown, via a bush member, which is not shown, press-fitted into the collar member 100.
The wheel-side mounting portion W1 is disposed corresponding to the wheel support member 110 provided at the rear end portion of the left trailing arm 20. In the wheel-side mounting portion W1, the bearing member is typically fastened to the wheel support member 110 by a fastening member such as a bolt, which is not shown.
The spring attachment portion S1 is disposed corresponding to the bottom wall portion 81 of the left spring seat 80. In the spring mounting portion S1, a spring, not shown, is mounted on the upper portion of the bottom wall portion 81 of the left spring receiver 80. In order to reduce the frictional sound of the spring, a disk-shaped elastic member may be placed in the plurality of mounting holes 84 provided in the bottom wall portion 81, and the spring may be placed on the elastic member.
The damper mounting portion D1 is disposed corresponding to the left and right side wall portions 92 and 93 of the damper bracket 90. In the damper mounting portion D1, the lower end portions of the dampers, not shown, are fastened by fastening members, typically bolts or the like, not shown, through left and right through holes provided in the left and right side wall portions 92 and 8, respectively, and are thereby assembled.
In addition, in the torsion beam 10 described above, the following structure is exemplified: although the welding hole 34 is provided in the bottom wall portion 31 of each of the left and right stiffeners 30, 130 and the middle hole 14 is provided in the upper wall portion 13 of the torsion beam 10, and welding is performed from the bottom wall portion 31 side, as shown in fig. 8, the following configuration may be adopted: the welding hole 14 'is provided in the upper wall portion 13 of the torsion beam 10, and the middle hole 34' is provided in the bottom wall portion 31 of each of the left reinforcement 30 and the right reinforcement 130, and welding is performed from the upper wall portion 13 side.
In the above configuration of the present embodiment, one of the connecting wall portion 13 of the torsion beam 10 and the left inner mounting portion 50 of the left reinforcement 30 has the left welding hole 34 provided with the welding portion for welding the same, one of the connecting wall portion 13 of the torsion beam 10 and the right reinforcement 130 has the right welding hole 34 provided with the welding portion for welding the same, and the connecting wall portion 13 has: a 1 st parallel hole 15 which is arranged on the right side in parallel to the left welding hole 34 and in which a welding portion for welding the left reinforcement 30 and the torsion beam 10 is not provided; and a 2 nd parallel hole 15 provided on the left side of the right welding hole, and not provided with a welded portion for welding the right reinforcement 130 and the torsion beam 10, whereby it is possible to achieve stress balance of the welded portion between the torsion beam 10 and the reinforcements 30, 130 while ensuring good productivity and high strength, and to reduce stress concentration at the welded portion, thereby improving durability of the torsion beam type suspension 1.
In the structure of the present embodiment, the connecting wall portion 13 of the torsion beam 10 further includes: a 3 rd parallel hole 16 which is arranged on the left side with respect to the left welding hole 34 and in which a welding portion for welding the left reinforcement 30 to the connecting wall portion 13 is not provided; and the 4 th parallel hole 16 which is arranged on the right side with respect to the right welding hole 34 and in which a welding portion for welding the right reinforcement 130 to the connecting wall portion 13 is not provided, whereby the degree of freedom is higher, and stress balance can be obtained in the welding portion between the torsion beam 10 and the reinforcements 30 and 130, particularly in the welding portion on the side of the left and right parallel portions.
In the present invention, the types, shapes, arrangements, numbers, and the like of the components are not limited to the above-described embodiments, and it is needless to say that the components can be appropriately replaced with components that exhibit equivalent effects, and the like, and can be appropriately modified within a range not departing from the gist of the present invention.
As described above, according to the present invention, it is possible to provide a torsion beam type suspension that can reduce stress concentration in a welded portion between a torsion beam and a trailing arm and improve strength and durability of the torsion beam while ensuring good productivity, high strength, and the like, and therefore, it is expected that the torsion beam type suspension can be widely applied to the field of torsion beam type suspensions for moving bodies such as vehicles and the like due to its general-purpose properties.
Claims (6)
1. A torsion beam suspension having:
a left trailing arm that extends in a longitudinal direction of a vehicle body on a left side in a width direction of the vehicle body, and that supports a front end side in the longitudinal direction on the vehicle body and supports a left wheel on a rear end side in the longitudinal direction;
a right trailing arm that extends in the longitudinal direction on the right side in the width direction, and that supports the vehicle body at a front end side in the longitudinal direction and supports a right wheel at a rear end side in the longitudinal direction;
a torsion beam that has a pair of wall portions extending in the width direction and facing each other in the longitudinal direction, and a connecting wall portion connecting between the pair of wall portions, and that connects the left trailing arm and the right trailing arm;
a left reinforcement extending in the width direction on the left side and having a left inner attachment portion attached to the torsion beam in an inner region surrounded by the pair of wall portions and the connecting wall portion of the torsion beam, a left outer attachment portion attached to the left trailing arm, and a left intermediate connecting portion connecting between the left inner attachment portion and the left outer attachment portion, the left reinforcement connecting the torsion beam and the left trailing arm; and
a right reinforcement extending in the width direction on the right side and having a right inner mounting portion mounted to an inner wall surface of the torsion beam at the inner region of the torsion beam, a right outer mounting portion mounted to an outer wall surface of the right trailing arm, and a right intermediate connecting portion connecting between the right inner mounting portion and the right outer mounting portion, the right reinforcement connecting the torsion beam and the right trailing arm,
wherein,
one of the connecting wall portion and the left inner mounting portion has a left welding hole in which a welding portion for welding the connecting wall portion and the left inner mounting portion is provided,
one of the connecting wall portion and the right inner mounting portion has a right welding hole in which a welding portion for welding the connecting wall portion and the right inner mounting portion is provided,
the connecting wall portion has: a 1 st parallel arrangement hole which is arranged on the right side in parallel to the left welding hole and is not provided with a welding part for welding the left reinforcement and the torsion beam; and a 2 nd juxtaposed hole which is juxtaposed to the right welding hole on the left side and is not provided with a welding portion for welding the right reinforcement and the torsion beam.
2. The torsion beam suspension of claim 1,
the hole shape at the juxtaposed portion of each of the left welding hole and the 1 st juxtaposed setting hole has a shape specified by a curve bulging rightward in the width direction,
the hole shape at the parallel portion of each of the right welding hole and the 2 nd parallel arrangement hole has a shape specified by a curved line that protrudes leftward in the width direction.
3. The torsion beam suspension according to claim 1 or 2,
the hole shape of the 1 st juxtaposed hole is a shape that becomes tapered as going to the right, and the hole shape of the 2 nd juxtaposed hole is a shape that becomes tapered as going to the left.
4. A torsion beam suspension according to any one of claims 1 to 3,
the connecting wall portion further has: a 3 rd parallel hole which is provided in parallel to the left side with respect to the left welding hole and in which a welding portion for welding the left reinforcement to the connection wall portion is not provided; and
and a 4 th parallel hole which is arranged on the right side in parallel to the right welding hole and is not provided with a welding part for welding the right reinforcement to the connecting wall part.
5. The torsion beam suspension of claim 4,
the area of the 1 st parallel hole is larger than the area of the 3 rd parallel hole, and the area of the 2 nd parallel hole is larger than the area of the 4 th parallel hole.
6. The torsion beam suspension according to claim 4 or 5,
the hole shape of the 3 rd juxtaposed hole is a shape that becomes tapered as going to the left, and the hole shape of the 4 th juxtaposed hole is a shape that becomes tapered as going to the right.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020037779A JP7441680B2 (en) | 2020-03-05 | 2020-03-05 | Torsion beam suspension |
| JP2020-037779 | 2020-03-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113352837A true CN113352837A (en) | 2021-09-07 |
| CN113352837B CN113352837B (en) | 2024-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110233513.7A Active CN113352837B (en) | 2020-03-05 | 2021-03-03 | Torsion beam type suspension |
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| JP (1) | JP7441680B2 (en) |
| CN (1) | CN113352837B (en) |
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| Publication number | Publication date |
|---|---|
| JP2021138283A (en) | 2021-09-16 |
| CN113352837B (en) | 2024-05-28 |
| JP7441680B2 (en) | 2024-03-01 |
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