CN113352837B - Torsion beam type suspension - Google Patents
Torsion beam type suspension Download PDFInfo
- Publication number
- CN113352837B CN113352837B CN202110233513.7A CN202110233513A CN113352837B CN 113352837 B CN113352837 B CN 113352837B CN 202110233513 A CN202110233513 A CN 202110233513A CN 113352837 B CN113352837 B CN 113352837B
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- hole
- torsion beam
- welding
- shape
- wall portion
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- 239000000725 suspension Substances 0.000 title claims abstract description 43
- 238000003466 welding Methods 0.000 claims abstract description 121
- 230000002787 reinforcement Effects 0.000 claims abstract description 54
- 239000003351 stiffener Substances 0.000 claims description 16
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 239000006096 absorbing agent Substances 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 230000035939 shock Effects 0.000 description 7
- 238000004080 punching Methods 0.000 description 6
- 230000003014 reinforcing effect Effects 0.000 description 6
- 238000005452 bending Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000002146 bilateral effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000000465 moulding Methods 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
- 230000000149 penetrating effect Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- 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 hole (15) which is provided on the right side of the left welding hole (34) in parallel and which is not provided with a welding portion for welding the left reinforcement (30) and the torsion beam (10); and a 2 nd parallel hole (15) which is provided on the left side with respect to the right weld Kong Binglie and which is not provided with a welded portion 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 in a vehicle such as a four-wheeled automobile.
Background
In recent years, torsion beam suspensions having a small number of parts, a relatively simple structure, and excellent space efficiency have been widely used for vehicle suspension devices such as four-wheeled automobiles, mainly for small-displacement vehicles.
Therefore, such a torsion beam type suspension is required to further increase its strength and rigidity while improving its productivity and the like.
Under such circumstances, international publication No. 2016/121989 discloses the following structure: in a torsion beam type suspension, a welding hole is provided in at least one of a torsion beam and a reinforcing member in order to reduce stress generated in a joint portion between the torsion beam and the reinforcing member, and an annular welded portion is formed around the entire periphery of the welding hole as an inner joint portion which is a joint portion between the torsion beam and the reinforcing member.
However, according to the study of the present inventors, in the structure of the torsion beam type suspension of international publication 2016/121989, for example, when a large load of opposite phases, which are different from each other in the vertical direction, is repeatedly applied to the wheel supporting portions of the left and right trailing arms, the degree of stress concentration in the annular welded portion on the torsion beam, which is repeatedly subjected to a large torsional deformation, is increased, 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 securing 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 the vehicle body on a left side in a width direction of the vehicle body, and that is supported by the vehicle body on a front end side in the longitudinal direction and supports a left wheel on a rear end side in the longitudinal direction; a right trailing arm extending in the longitudinal direction on the right side in the width direction, the right trailing arm being supported by the vehicle body on the front end side in the longitudinal direction and supporting a right wheel on the rear end side in the longitudinal direction; a torsion beam that has a pair of wall portions extending in the width direction and opposed to each other in the length 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 mounting portion mounted 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 mounting portion mounted to the left trailing arm, and a left intermediate connecting portion connecting the left inner mounting portion and the left outer mounting portion, the left reinforcement connecting the torsion beam and the left trailing arm; and a right stiffener extending in the width direction on the right side and having a right inner attachment portion attached to an inner wall surface of the torsion beam in the inner region of the torsion beam, a right outer attachment portion attached to an outer wall surface of the right trailing arm, and a right intermediate connection portion connecting the right inner attachment portion and the right outer attachment portion, wherein one of the connection wall portion and the left inner attachment portion has a left welding hole in which a welding portion for welding the connection wall portion and the left inner attachment portion is provided, one of the connection wall portion and the right inner attachment portion has a right welding hole in which a welding portion for welding the connection wall portion and the right inner attachment portion is provided, the connection wall portion has: a 1 st parallel hole provided on the right side with respect to the left weld Kong Binglie, and not provided with a welded portion for welding the left reinforcement and the torsion beam; and a 2 nd parallel hole provided on the left side with respect to the right weld Kong Binglie, and not provided with a welded portion that welds the right stiffener and the torsion beam.
Further, according to a2 nd aspect of the present invention, in the 1 st aspect, the hole shapes of the left welding hole and the 1 st juxtaposed hole at the juxtaposed portion each have a shape defined by a curve protruding rightward in the width direction, and the hole shapes of the right welding hole and the 2 nd juxtaposed hole at the juxtaposed portion each have a shape defined by a curve protruding leftward in the width direction.
Further, according to a3 rd aspect of the present invention, in the 1 st or 2 nd aspect, the hole shape of the 1 st parallel arrangement hole is a shape that becomes tapered as going to the right, and the hole shape of the 2 nd parallel arrangement hole is a shape that becomes tapered as going to the left.
In addition, according to the 4 th aspect of the present invention, in any one of the 1 st to 3 rd aspects, the connecting wall portion further includes: a 3 rd parallel hole provided on the left side with respect to the left weld Kong Binglie, and not provided with a welded portion for welding a left reinforcement to the connection wall portion; and a 4 th parallel hole provided on the right side with respect to the right weld Kong Binglie, and not provided with a welded portion for welding the right reinforcement to the connection wall portion.
In the invention according to claim 5, in the invention according to claim 4, the 1 st side-by-side hole has a larger area than the 3 rd side-by-side hole, and the 2 nd side-by-side hole has a larger area than the 4 th side-by-side hole.
Further, according to a 6 th aspect of the present invention, in the 4 th or 5 th aspect, the hole shape of the 3 rd parallel arrangement hole is a shape that becomes tapered as going to the left, and the hole shape of the 4 th parallel arrangement hole is a shape that becomes tapered as going to the right.
According to the structure of the 1 st aspect of the present invention, one of the connecting 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 connecting wall portion of the torsion beam and the right reinforcement has a right welding hole provided with a welding portion for welding them, the connecting wall portion has: a1 st parallel hole provided on the right side with respect to the left weld Kong Binglie and not provided with a welded portion for welding the left reinforcement and the torsion beam; and a2 nd parallel hole provided on the left side with respect to the right weld Kong Binglie and not provided with a welded portion for welding the right stiffener and the torsion beam, whereby it is possible to obtain stress balance for the welded portion between the torsion beam and the stiffener while securing good productivity, high strength, etc., reduce stress concentration at the welded portion, and improve durability of the torsion beam type suspension.
Further, according to the structure of the 2 nd aspect of the present invention, the respective hole shapes of the left welding hole and the 1 st parallel hole at the parallel portion have a shape defined by a curve protruding to the right in the width direction, and the respective hole shapes of the right welding hole and the 2 nd parallel hole at the parallel portion have a shape defined by a curve protruding to the left in the width direction, whereby the stress concentration of the welded portion between the torsion beam and the stiffener can be reduced more reliably.
Further, according to the structure of claim 3 of the present invention, 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, whereby stress concentration for the 1 st juxtaposed hole and the 2 nd juxtaposed hole can be reduced, and durability can be improved.
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 provided on the left side with respect to the left weld Kong Binglie, and not provided with a welded portion for welding the left reinforcement to the connection wall portion; and a 4 th parallel hole provided on the right side with respect to the right weld Kong Binglie and not provided with a welded portion for welding the right stiffener to the connecting wall portion, whereby the degree of freedom is higher and stress balance can be achieved at the welded portion between the torsion beam and the stiffener, particularly at the welded portion on the side of the left and right parallel portions.
Further, according to the structure of claim 5 of the present invention, 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, whereby the stress balance of the welded portion between the torsion beam and the stiffener, particularly the welded portion on the side of the left and right parallel portions can be more reliably obtained.
Further, according to the structure of the 6 th aspect of the present invention, the hole shape of the 3 rd parallel arrangement hole is a shape that becomes tapered as going to the left, and the hole shape of the 4 th parallel arrangement hole is a shape that becomes tapered as going to the right, whereby the stress concentration of the welded portion between the torsion beam and the stiffener, particularly the welded portion on the side of the left and right parallel arrangement 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 cross-sectional view of A-A of fig. 1.
Fig. 5 is an enlarged cross-sectional view of B-B of fig. 1.
Fig. 6 is an enlarged cross-sectional view of C-C of fig. 1.
Fig. 7 is an enlarged sectional view of D-D of fig. 1.
Fig. 8 is an enlarged cross-sectional view of the torsion beam type suspension in the modification of the present embodiment, and corresponds in position to fig. 6.
Description of the reference numerals
1: 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 hole;
15a: an outer shape portion;
15b: an inner side shape portion;
16: an outer aperture;
16a: an outer shape portion;
16b: an inner side shape portion;
20. 120: a trailing arm;
30. 130: a reinforcing member;
31: a bottom wall portion;
32: a front flange;
33: a rear flange;
34. 14': welding holes;
35: a through hole;
40: an outer mounting portion;
50: an inner mounting portion;
60: an intermediate connection portion;
80. 180: a spring seat;
81: a bottom wall portion;
82: a convex portion;
83: a through hole;
84: a mounting hole;
85: an inclined wall portion;
86: a rear wall portion;
87: a flange;
90. 190: a shock absorber bracket;
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: closing the section;
g: a gap portion;
b1: a vehicle body mounting portion;
s1: a spring mounting portion;
D1: a damper mounting portion;
W1: wheel-side mounting portions.
Detailed Description
The torsion beam type suspension according to the embodiment of the present invention will be described in detail with reference to fig. 1 to 5. In addition, in the figure, the x-axis, y-axis, and z-axis constitute a 3-axis rectangular coordinate system. 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. The direction of the x-axis is sometimes referred to as the longitudinal direction, the direction of the y-axis is sometimes referred to as the width direction, and the direction of the z-axis is sometimes referred to as the up-down 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 this order. Fig. 1 to 7 each mainly show the left-side component of the torsion beam type suspension, but the right-side component 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, the right side of the torsion beam type suspension is shown with a representative constituent element by a bracket.
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 suspension springs (hereinafter referred to as springs), suspension dampers (hereinafter referred to as dampers), wheels, and the like.
Specifically, the torsion beam type suspension 1 mainly includes a torsion beam 10, a pair of right and left trailing arms 20, 120, and a pair of right and left reinforcements 30, 130. 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 damper brackets 90, 190.
Typically, the torsion beam 10 is a plate member made of a metal plate such as a steel plate having a shape protruding upward by press forming or the like, extends in the width direction, and has a pair of left and right trailing arms 20, 120 connected to both ends thereof.
Specifically, the torsion beam 10 has a longitudinal section taken along a plane parallel to the x-z plane, the front longitudinal wall 11 and the rear longitudinal wall 12 facing each other in the longitudinal direction, and an upper wall (connecting wall) 13 connecting upper ends of the front longitudinal wall 11 and the rear longitudinal wall 12 in the longitudinal direction, and the torsion beam 10 has an open cross-sectional shape that opens downward. The torsion beam 10 may have an open cross-sectional shape that opens in a direction other than the downward direction, if necessary.
Here, typically, the torsion beam type suspension 1 has a substantially bilateral symmetry 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 a bilateral symmetry shape with respect to each other 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 brackets 90 and 190 have shapes that are laterally symmetrical to each other with respect to the center plane, and are disposed at laterally symmetrical positions, respectively. Hereinafter, 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 are representatively described by taking the left trailing arm 20, the left reinforcement 30, the left spring seat 80, and the left shock absorber bracket 90 as examples.
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 steel plate or the like, which is rolled up to support a vehicle body is welded to a front end portion of the left trailing arm 20 by arc welding or the like, while a wheel support member 110, typically a steel plate or the like, which is welded to a rear end portion of the left trailing arm 20 by arc welding or the like so that a part of the wheel support member 110 is inserted into the rear end portion of the left trailing arm 20. If necessary, 2 structural members each having a longitudinal section of a shape of substantially japanese katakana コ and formed of a metal plate such as a steel plate may be prepared, and the members may be integrated by welding such as arc welding in a state where they face each other in the width direction, so that the left trailing arm 20 is obtained, or the left trailing arm 20 may be formed of 1 pipe member made of 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 formed of a metal plate such as a steel plate molded by press molding or the like, and is disposed so as 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, respectively, by arc welding or the like, thereby reinforcing them and connecting them to each other.
Specifically, the left stiffener 30 includes a bottom wall 31 as a main body portion thereof, a front flange 32 erected upward from a front end portion of the bottom wall 31, and a rear flange 33 erected upward from a rear end portion of the bottom wall 31, and the front flange 32 and the rear flange 33 extend in the width direction together with the bottom wall 31, respectively.
The left reinforcement 30 further has an outer mounting portion 40 welded to the left end portion of the outer wall surface of the left trailing arm 20, on the outside of the left end of the torsion beam 10. The outer mounting portion 40 has left end portions of the bottom wall portion 31, the front flange 32, and the rear flange 33, which are formed so as to have a shape that follows the outer contour shape of the left trailing arm 20, and the 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 abut against the outer wall surface of the left trailing arm 20.
The left reinforcement 30 further has an inner mounting portion 50, which is a right end portion welded thereto, inside the torsion beam 10. The inner attachment portion 50 has a right end portion of the bottom wall portion 31 formed so as to be shaped 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 formed so as to be shaped 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 formed so as to be shaped 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 cooperate with the inner wall surface of the torsion beam 10 to constitute a closed cross-section portion S that improves the strength and rigidity of the torsion beam 10. In addition, regarding the right end portion of the front flange 32 and the right end portion of the rear flange 33, from the viewpoint of improving the formability of the left reinforcement 30, the upper and lower lengths thereof can be reduced, and in the case where the strength of the left reinforcement 30 and the welding strength of the bottom wall portion 31 and the inner wall surface of the torsion beam 10 can be ensured, the upper and lower lengths 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, respectively, to eliminate the front flange 32 and the rear flange 33.
In addition, the left reinforcement 30 has an intermediate connection portion 60 connecting the outer mounting portion 40 and the inner mounting portion 50. The intermediate connection portion 60 is a diagonal portion that gradually rises from the outer attachment portion 40 toward the inner attachment portion 50 and extends in the width direction. By adopting such a diagonal portion for the intermediate connection portion 60, abrupt shape change in the longitudinal cross-sectional shape of the torsion beam 10 in the width direction can be suppressed, and stress concentration at the portion where the shape of the torsion beam 10 changes can be relaxed. In addition, from the viewpoint of improving the strength and rigidity of the torsion beam 10 and improving the joint strength of the torsion beam 10 and the left trailing arm 20, the closed cross-section 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. 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 so as not to generate unnecessary gaps, it is more preferable that the torsion beam 10 and the left reinforcement 30 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, there is mentioned a case where, in a state where portions of the collar members 100 of the left trailing arm 20 and the right trailing arm 120 are pivotally supported by the vehicle body, one or more up-down loads having opposite phases, which are different from each other in the up-down direction, are applied to portions of the wheel supporting members 110 of the left trailing arm 20 and the right trailing arm 120, and in this case, the degree of concentration of stress 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 in the welded portion, the inner attachment portion 50 of the left reinforcement 30 is provided with a welded hole 34 (left welded hole in the left reinforcement 30 and right welded hole in the right reinforcement 130) formed by punching so as to penetrate the bottom wall portion 31 in the vertical direction. Typically, the welding hole 34 is arranged at the center of the bottom wall 31 in the longitudinal direction, and is a circular hole having a circular shape in a plan view. In a state where the upper wall surface of the bottom wall portion 31 reaching the periphery of the welding hole 34 and surrounding 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 or a part of the periphery of the welding hole 34, thereby constituting a weld portion not shown. In order to reduce stress concentration in the welded portion, a concave portion may be provided in a portion of the upper wall portion 13 facing the welding hole 34, and in this case, the intermediate hole 14 is preferably provided so as to penetrate the center of the concave portion in the up-down direction from the viewpoint of drainage or the like. The welding hole 34 may be a circular hole, or an oblong hole having a major axis in a longitudinal direction, a width direction, or a direction parallel to a direction intersecting the longitudinal direction, or the like. In addition, as the welded portion of the welded hole 34, not only the hole peripheral edge but also a plug welded portion obtained by plug welding so as to block the entire welded hole 34 may be used. 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 may be welded together by arc welding or the like, respectively, 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, respectively, as necessary.
Further, from the viewpoint of reducing stress concentration in the weld hole 34 by balancing the stress with the weld portion provided for the weld hole 34, it is preferable that the upper wall portion 13 of the torsion beam 10 has an inner hole 15 (the 1 st side by side hole with respect to the weld hole of the left reinforcement 30 and the 2 nd side by side hole with respect to the weld hole of the right reinforcement 130), the inner hole 15 is formed by punching a hole penetrating the upper wall portion 13 in the vertical direction with respect to the weld hole 34, and the weld portion for welding the left reinforcement 30 to the torsion beam 10 is not provided. Typically, the inner hole 15 has a centroid C2 on a straight line L1 passing through the centroid C1 of the welding hole 34 and extending in the width direction in a plan view, and has a hole shape line-symmetrical with respect to the straight line L1. Specifically, from the viewpoint of ensuring the degree of freedom in achieving stress balance and reliably reducing stress concentration at the welded portion provided for 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 side portion of the welding hole 34 and the hole shape of the shape portion (outer shape portion) 15a of the left side portion of the inner hole 15 extend along each other so as to intersect the straight line L1 in a plan view, and have portions defined by curves protruding in the right direction in the width direction. In order to simplify the setting of the hole shapes of the parallel portions of the welding hole 34 and the inner hole 15, the hole shape of the welding hole 34 may be first set to be a circular hole, and the hole shape of the outer shape portion 15a of the parallel portion of the inner hole 15 to be arranged in parallel 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 provided in parallel with the welding hole 34 may be defined by a curve having a curvature smaller than that of the circular hole shape of the welding hole 34, according to necessity of reducing stress or the like.
Further, from the viewpoint of reliably reducing stress concentration at the welded portion provided for the welding hole 34, it is preferable that the hole shape of the inner side hole 15 at the right side opposite to the side where the welding hole 34 and the inner side hole 15 are juxtaposed is a shape flattened in the longitudinal direction and tapered in the rightward direction (a shape in which the distance between 2 points on the hole peripheral edges opposed in the longitudinal direction gradually decreases). In the inner hole 15, it is preferable that the right end portion of the left reinforcement 30 is disposed in the inner hole 15 from the viewpoint of drainage or the like, 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 for positioning or the like in correspondence with the inner hole 15.
Further, in addition to the inner hole 15, from the viewpoint of balancing the stress with the welded portion provided for the welded hole 34 and reducing the concentration of the stress at the welded hole 34, it is preferable that the upper wall portion 13 of the torsion beam 10 has an outer hole 16 (3 rd parallel hole with respect to the welded hole of the left reinforcement 30 and 4 th parallel hole with respect to the welded hole of the right reinforcement 130), the outer hole 16 is provided in parallel to the welded hole 34 on the left side, is formed by punching so as to penetrate the upper wall portion 13 in the up-down direction, and is not provided with a welded portion for welding the left reinforcement 30 to the torsion beam 10. Typically, the outer hole 16 has a centroid C3 on the straight line L1 in a plan view, and has a hole shape line-symmetrical with respect to the straight line L1. In detail, from the viewpoint of ensuring the degree of freedom in achieving stress balance and reliably reducing stress concentration at the welded portion provided for the welding hole 34, it is preferable that the hole shape of the outer shape portion 16a of the outer hole 16 on the left side opposite to the parallel portion of the welding hole 34 and the outer hole 16 is a shape flattened in the longitudinal direction and tapered in the leftward direction (a shape in which the distance between 2 points on the hole peripheral edge opposed in the longitudinal direction gradually decreases). It is preferable that the hole shape of the inner side shape portion 16b of the right side portion, which is a parallel portion of the outer hole 16 parallel to the welding hole 34, is defined by a straight line extending in the longitudinal direction or a curve protruding to the left in the width direction, while the hole shape of the welding hole 34 and the hole shape of the inner side hole 15 are both considered. In the case where the welding hole 34 is circular in 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 facilitate the balance of stress between the welding portion provided for the welding 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 securing a necessary welding area by balancing the stress with the welded portion provided for the welding hole 34 in this way, it is preferable that the area of the welding hole 34 is set 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 molded by press molding or the like, 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 portion 81 parallel to the x-y plane, a convex portion 82 having a shape protruding upward from the central portion of the bottom wall portion 81, and a through hole 83 formed by punching 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 punching the bottom wall 81 in the vertical direction.
The left spring seat 80 further includes an inclined wall portion 85 provided obliquely upward from the front right end portion of the bottom wall portion 81, and a curved rear wall portion 86 provided upstanding upward from the rear end portion of the bottom wall portion 81 and protruding rearward in a plan view.
In the left spring seat 80, the front end portion of the inclined wall portion 85 is formed so as to have a shape that follows the shape of the outer wall surface of the rear vertical wall 12 of the torsion beam 10. The portion molded in this way is welded to the outer wall surface of the rear vertical wall 12 by arc welding or the like in a state of abutting against the outer wall surface of the rear vertical wall 12. From the standpoint of improving the rigidity of the rear vertical wall portion 12 of the torsion beam 10 and the supporting strength of the rear vertical wall portion 12 by the left reinforcement 30 and the left spring seat 80, respectively, it is preferable that the inclined wall portion 85 is provided in parallel with the left reinforcement 30 across the rear vertical wall portion 12 of the torsion beam 10. The left end portion of the rear wall portion 86 is molded so as to have a shape along the outer wall surface of the left trailing arm 20. The portion molded in this way is welded to the outer wall surface of the left trailing arm 20 by arc welding or the like so as to abut against the outer wall surface of the left trailing arm 20.
The left spring seat 80 further has a flange 87 formed by bending the upper end portions of the inclined wall portion 85 and the rear wall portion 86 outward. In addition, the flange 87 can be omitted in the case where the strength is sufficiently ensured due to the thicker plate thickness of the left spring seat 80 or the like.
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 portion 91 parallel to the x-y plane, and a left side wall portion 92 and a right side wall portion 93 that are provided so as to face each other in the width direction upward from both ends in the width direction of the bottom wall portion 91.
In the shock absorber 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 side wall 92 and the right side wall 93 have left and right through holes formed by punching the shock absorber in the width direction so as to face each other, respectively, with the lower end portion of the shock absorber being housed therebetween and supported freely. Further, a nut member, not shown, may be provided in one of these 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 to the left, and a flange 95 formed by bending the upper end portion of the right side wall portion 93 to the right. 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 abutting against 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 abutting against 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 abutting against 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 in correspondence with 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 on the vehicle body by being fastened by a fastening member, typically a bolt, which is not shown, through a bushing member, which is not shown, that is press-fitted into the collar member 100.
The wheel-side mounting portion W1 is disposed in correspondence with the wheel supporting member 110 provided at the rear end portion of the left trailing arm 20. In the wheel-side mounting portion W1, a bearing member is typically fastened to the wheel supporting member 110 by a fastening member such as a bolt, which is not shown in the drawings.
The spring mounting 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 an upper portion of the bottom wall portion 81 of the left spring seat 80. In order to reduce friction 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 in correspondence with the left side wall portion 92 and the right side wall portion 93 of the damper bracket 90. In the damper mounting portion D1, the lower end portions of the dampers, which are not shown, are fastened by fastening members, typically bolts, which are not shown, through left and right through holes provided in the left and 8 right side wall portions 92 and 93, respectively, to be assembled.
In the torsion beam 10 described above, the following structure is exemplified: the welding holes 34 are provided in the bottom wall 31 of each of the left and right stiffeners 30, 130, and the intermediate holes 14 are provided in the upper wall 13 of the torsion beam 10, and welding is performed from the bottom wall 31 side, but as shown in fig. 8, the following configuration may be adopted: the upper wall portion 13 of the torsion beam 10 is provided with a welding hole 14', and the bottom wall portions 31 of the left and right reinforcing members 30 and 130 are provided with intermediate holes 34', and welding is performed from the upper wall portion 13 side.
In the above-described 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 a welding portion for welding them, 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 a welding portion for welding them, and the connecting wall portion 13 has: a1 st parallel hole 15 that is provided on the right side with respect to the left welding hole 34, and that is not provided with a welded portion for welding the left reinforcement 30 and the torsion beam 10; and the 2 nd parallel hole 15 provided on the left side with respect to the right weld Kong Binglie, and not provided with a welded portion for welding the right stiffener 130 and the torsion beam 10, whereby the stress balance of the welded portion between the torsion beam 10 and the stiffeners 30, 130 can be obtained while securing good productivity, high strength, etc., and the stress concentration of the welded portion can be reduced, improving the 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: a3 rd parallel hole 16 that is provided on the left side with respect to the left welding hole 34, and that is not provided with a welded portion that welds the left reinforcement 30 to the connection wall portion 13; and the 4 th parallel hole 16 which is provided on the right side with respect to the right welding hole 34 and in which no welding portion for welding the right stiffener 130 to the connecting wall portion 13 is provided, whereby the degree of freedom is higher and stress balance can be achieved at the welding portion between the torsion beam 10 and the stiffeners 30 and 130, particularly at the welding portion on the side of the left and right parallel portions.
In the present invention, the types, shapes, arrangements, and numbers of components are not limited to the above-described embodiments, and the components may be appropriately replaced with components that exhibit equivalent effects, and the like, without departing from the scope of the present invention.
As described above, in the present invention, it is possible to provide a torsion beam type suspension capable of reducing stress concentration at a welded portion between a torsion beam and a trailing arm and improving strength and durability of the torsion beam while securing good productivity, high strength, and the like, and therefore, it is expected that the present invention can be widely applied to the field of torsion beam type suspensions for mobile bodies such as vehicles due to its general properties.
Claims (6)
1. A torsion beam suspension having:
A left trailing arm that extends in a longitudinal direction of the vehicle body on a left side in a width direction of the vehicle body, and that is supported by the vehicle body on a front end side in the longitudinal direction and supports a left wheel on a rear end side in the longitudinal direction;
A right trailing arm extending in the longitudinal direction on the right side in the width direction, the right trailing arm being supported by the vehicle body on the front end side in the longitudinal direction and supporting a right wheel on the rear end side in the longitudinal direction;
A torsion beam that has a pair of wall portions extending in the width direction and opposed to each other in the length 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 mounting portion mounted 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 mounting portion mounted to the left trailing arm, and a left intermediate connecting portion connecting the left inner mounting portion and the left outer mounting 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 on an inner wall surface of the torsion beam in the inner region of the torsion beam, a right outer mounting portion mounted on an outer wall surface of the right trailing arm, and a right intermediate connecting portion connecting 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, a welding portion for welding the connecting wall portion and the left inner mounting portion is provided in the left welding hole,
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: a1 st parallel hole provided on the right side with respect to the left weld Kong Binglie, and not provided with a welded portion for welding the left reinforcement and the torsion beam; and a2 nd parallel hole provided on the left side with respect to the right weld Kong Binglie, and not provided with a welded portion that welds the right stiffener and the torsion beam.
2. The torsion beam type suspension according to claim 1, wherein,
The hole shapes at the juxtaposed portions of the left welding hole and the 1 st juxtaposed hole each have a shape prescribed by a curve protruding rightward in the width direction,
The hole shape at the juxtaposed portion of each of the right welding hole and the 2 nd juxtaposed hole has a shape prescribed by a curve protruding leftward in the width direction.
3. Torsion beam type suspension according to claim 1 or 2, wherein,
The hole shape of the 1 st parallel hole is a shape that becomes tapered as going to the right, and the hole shape of the 2 nd parallel hole is a shape that becomes tapered as going to the left.
4. Torsion beam type suspension according to claim 1 or 2, wherein,
The connecting wall portion further has: a 3 rd parallel hole provided on the left side with respect to the left weld Kong Binglie, and not provided with a welded portion for welding a left reinforcement to the connection wall portion; and
And 4 th parallel holes provided on the right side with respect to the right welding Kong Binglie, and not provided with a welded portion for welding the right reinforcement to the connection wall portion.
5. The torsion beam type suspension according to claim 4, wherein,
The 1 st side-by-side hole has a larger area than the 3 rd side-by-side hole, and the 2 nd side-by-side hole has a larger area than the 4 th side-by-side hole.
6. The torsion beam type suspension according to claim 4, wherein,
The 3 rd parallel hole has a hole shape that becomes tapered as it goes to the left, and the 4 th parallel hole has a hole shape that becomes tapered as it goes to the right.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-037779 | 2020-03-05 | ||
| JP2020037779A JP7441680B2 (en) | 2020-03-05 | 2020-03-05 | Torsion beam suspension |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113352837A CN113352837A (en) | 2021-09-07 |
| CN113352837B true 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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| CN113352837A (en) | 2021-09-07 |
| JP2021138283A (en) | 2021-09-16 |
| JP7441680B2 (en) | 2024-03-01 |
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