CN111746216B - Torsion beam type suspension - Google Patents
Torsion beam type suspension Download PDFInfo
- Publication number
- CN111746216B CN111746216B CN202010217216.9A CN202010217216A CN111746216B CN 111746216 B CN111746216 B CN 111746216B CN 202010217216 A CN202010217216 A CN 202010217216A CN 111746216 B CN111746216 B CN 111746216B
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- torsion beam
- mounting portion
- wall portion
- welding hole
- trailing arm
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- 239000000725 suspension Substances 0.000 title claims abstract description 52
- 238000003466 welding Methods 0.000 claims abstract description 87
- 230000002787 reinforcement Effects 0.000 claims description 34
- 230000003014 reinforcing effect Effects 0.000 claims description 25
- 239000002184 metal Substances 0.000 description 11
- 230000004048 modification Effects 0.000 description 11
- 238000012986 modification Methods 0.000 description 11
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 238000005452 bending Methods 0.000 description 8
- 230000002093 peripheral effect Effects 0.000 description 6
- 239000003351 stiffener Substances 0.000 description 6
- 239000006096 absorbing agent Substances 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- B60G21/051—Trailing arm twist beam axles
-
- 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
- B60G21/051—Trailing arm twist beam axles
- B60G21/052—Mounting means therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/80—Interactive suspensions; arrangement affecting more than one suspension unit
- B60G2204/82—Interactive suspensions; arrangement affecting more than one suspension unit left and right unit on same axle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/80—Interactive suspensions; arrangement affecting more than one suspension unit
- B60G2204/83—Type of interconnection
- B60G2204/8302—Mechanical
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
The present invention provides a torsion beam type suspension, wherein a welding part is set corresponding to a seat part arranged on an upper wall part of a torsion beam, the bottom wall part is contacted with the seat part to be welded, and the seat part is a part of the upper wall part protruding towards a protruding direction (upward direction) far from an inner area of the torsion beam.
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-wheeled motor vehicle.
Background
In recent years, a torsion beam type suspension, which has a small number of parts, a relatively simple structure, and excellent space efficiency, has been widely used for a vehicle suspension device such as a four-wheeled motor vehicle, mainly for a small displacement vehicle.
In this torsion beam type suspension, it is required to secure required strength and rigidity while suppressing unnecessary influence on productivity and the like, and therefore, a structure has been proposed in which a right and left trailing arm and a torsion beam are connected by a reinforcing member extending in the torsion beam.
In this case, the specification of european patent application publication No. 2896522 relates to an axle of a motor vehicle, and discloses the following structure: the motor vehicle axle is provided with: two vertical supports (trailing arms) arranged along the longitudinal direction of the vehicle; a cross support body that extends in a lateral direction of the vehicle and that couples the two trailing arms to each other; and a reinforcing piece that connects the two trailing arms and the lateral support body, wherein a spot-like connection portion such as a plug weld is provided in a terminal region on the lateral support body side of the reinforcing piece, the spot-like connection portion connecting the bottom web of the metal profile of the lateral support body and the reinforcing piece.
Disclosure of Invention
However, according to the studies of the present inventors, in the structure of the specification of european patent application publication No. 2896522, since the point-like coupling portion is provided, the force acting on the coupling portion is better distributed, and the stress generated in the terminal region on the side of the lateral support body of the reinforcing sheet is intended to be reduced, but the point-like coupling portion is disposed with respect to an ellipse or a long hole extending in the longitudinal direction of the vehicle and is coupled with the flat plate-like bottom web in the metal profile of the lateral support body, there is a natural limit to the degree of reduction of the stress, and there is room for improvement in this point.
Further, according to the study of the present inventors, in the torsion beam type suspension, it is required to optimize the torsional rigidity of the torsion beam in addition to ensuring the joining strength of the torsion beam and the trailing arm and the bending rigidity of the torsion beam, but when joining them with the reinforcing member in order to enhance the joining strength of the torsion beam and the trailing arm and the bending rigidity of the torsion beam, particularly when the torsional rigidity of the torsion beam is adjusted by adjusting the structure of the reinforcing member, the tendency of stress concentration in the joining portion of the torsion beam and the reinforcing member becomes strong. That is, since the degree of freedom in design for optimizing the torsional rigidity of the torsion beam is limited to a low level in this case, it is currently desired to realize a new structure for improving the degree of freedom in design for optimizing the torsional rigidity of the torsion beam.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a torsion beam type suspension in which, when a torsion beam and a trailing arm are connected by a reinforcing member, torsion characteristics of the torsion beam can be set with a high degree of freedom so that the joining strength between the torsion beam and the trailing arm and the bending rigidity of the torsion beam are ensured, and stress concentration at a joint portion between the torsion beam and the reinforcing member is suppressed.
In order to achieve the above object, a torsion beam type suspension according to a first aspect of the present invention includes: 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, is supported by the vehicle body on a front side in the longitudinal direction, and supports wheels on a rear side in the longitudinal direction; a right trailing arm extending in the longitudinal direction on the right side in the width direction, supported by the vehicle body on the front side in the longitudinal direction, and supporting a wheel on the rear side in the longitudinal direction; a torsion beam extending in the width direction, having an open cross-sectional shape having a pair of wall portions facing each other and a connecting wall portion connecting the pair of wall portions, and connecting the left trailing arm and the right trailing arm in a longitudinal section taken along a plane perpendicular to the width direction; a left reinforcement extending in the width direction on the left side, and having: an inner left 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; an outer left mounting portion mounted to the left trailing arm; and a middle left connecting portion connecting the inner left mounting portion and the outer left mounting portion, the left reinforcing member connecting the torsion beam and the left trailing arm; and a right reinforcement extending in the width direction on the right side, and having: an inner right mounting portion mounted to the torsion beam in the inner region; an outer right mounting portion mounted to the right trailing arm; and a middle right connecting portion that connects between the inner right mounting portion and the outer right mounting portion, the right reinforcing member connecting the torsion beam and the right trailing arm, the torsion beam having, in the connecting wall portion: a left seat portion provided with a left welding portion where the inner left mounting portion is welded to the connection wall portion; and a right seat portion in which the right welding portion is arranged, the inner right mounting portion being welded to the connection wall portion, the left seat portion being a portion of the connection wall portion protruding in a protruding direction away from the inner region, the right seat portion being a portion of the connection wall portion protruding in the protruding direction.
In addition to the first aspect, the second aspect of the present invention is that the left welding portion is disposed in a left plug welding hole provided in one of the connection wall portion and the inner left mounting portion, the left plug welding hole is a long hole having a different diameter of a pair of circular arcs opposing each other in a direction perpendicular to the protruding direction, and the right welding portion is disposed in a right plug welding hole provided in one of the connection wall portion and the inner right mounting portion, the right plug welding hole is a long hole having a different diameter of a pair of circular arcs opposing each other in a direction perpendicular to the protruding direction.
In addition to the second aspect, according to a third aspect of the present invention, the left plug welding hole is provided in the inner left mounting portion, and the right plug welding hole is provided in the inner right mounting portion.
Further, according to a fourth aspect of the present invention, in addition to the third aspect, the left seat portion has a portion recessed toward the inner region so that a part thereof enters the left plug welding hole, and the right seat portion has a portion recessed toward the inner region so that a part thereof enters the right plug welding hole.
In the fifth aspect of the present invention, in addition to the second aspect, the left plug welding hole is provided in the left seat portion, and the right plug welding hole is provided in the right seat portion.
Further, according to a sixth aspect of the present invention, in addition to the third aspect, the inner left mounting portion has a portion recessed toward the inner region so that a part thereof is away from the left plug welding hole, and the inner right mounting portion has a portion recessed toward the inner region so that a part thereof is away from the right plug welding hole.
Further, according to a seventh aspect of the present invention, in addition to any one of the first to sixth aspects, in the inner left mounting portion, a left flat wall portion is provided so as to be offset from a right end portion of the inner left mounting portion toward the outer left mounting portion and to be opposed to the connecting wall portion so as to be separated therefrom, the left flat wall portion is a portion where the inner left mounting portion is recessed toward the connecting wall portion, the right end portion of the inner left mounting portion and the left flat wall portion are connected by a left inclined wall portion, and in the inner right mounting portion, a right flat wall portion is provided so as to be offset from a left end portion of the inner right mounting portion toward the outer right mounting portion and to be opposed to the connecting wall portion so as to be separated therefrom, the right flat wall portion is a portion where the inner right mounting portion is recessed toward the connecting wall portion, and the left end portion of the inner right mounting portion and the right flat wall portion are connected by a right inclined wall portion.
Further, according to an eighth aspect of the present invention, in the seventh aspect, the front side portion of the right end portion and the rear side portion of the right end portion of the left flat wall portion have right protruding portions protruding to the right side, respectively, and the front side portion of the left end portion and the rear side portion of the left end portion of the right flat wall portion have left protruding portions protruding to the left side, respectively.
According to the structure of the first aspect of the present invention, the torsion beam has, in the connecting wall portion: a left seat portion provided with a left welding portion at which an inner left mounting portion of the left reinforcement is welded to the connection wall portion; and a right seat portion in which a right welding portion is arranged, an inner right mounting portion of the right stiffener being welded to the connecting wall portion, the left seat portion being a portion in which the connecting wall portion protrudes in a protruding direction away from an inner region of the torsion beam, the right seat portion being a portion in which the connecting wall portion protrudes in a protruding direction away from an inner region of the torsion beam, whereby, when the torsion beam and the trailing arm are connected by the stiffener, rigidity of the connecting wall portion including the left seat portion and the right seat portion can be increased, and forces to be applied to a joint portion of the torsion beam and the stiffener can be dispersed, whereby joint strength of the torsion beam and the trailing arm and bending rigidity of the torsion beam can be ensured, and concentration of stress on the joint portion of the torsion beam and the stiffener can be suppressed, and torsion characteristics of the torsion beam can be set with a high degree of freedom.
Further, according to the structure of the second aspect of the present invention, the left welding portion is disposed at the left plug welding hole provided at one of the connection wall portion and the inner left mounting portion, the left plug welding hole is a long hole having a different diameter of the pair of circular arcs opposed to each other in the direction perpendicular to the protruding direction, the right welding portion is disposed at the right plug welding hole provided at one of the connection wall portion and the inner right mounting portion, and the right plug welding hole is a long hole having a different diameter of the pair of circular arcs opposed to each other in the direction perpendicular to the protruding direction, whereby concentration of stress at the joint portion of the torsion beam and the reinforcing member can be reliably suppressed, and the torsion characteristic of the torsion beam can be set with a high degree of freedom.
Further, according to the structure of the third aspect of the present invention, the left plug welding hole is provided in the inner left mounting portion, and the right plug welding hole is provided in the inner right mounting portion, whereby the welding portion can be set on the left and right reinforcement sides that are generally directed downward in the vehicle, and the occurrence of the dust, moisture, and the like stagnating in the welding portion while the concentration of stress in the joint portion of the torsion beam and the reinforcing member can be reliably suppressed.
Further, according to the structure of the fourth aspect of the present invention, the left seat portion has the portion recessed toward the inner region so that the part thereof enters the left plug hole, and the right seat portion has the portion recessed toward the inner region so that the part thereof enters the right plug hole, whereby it is possible to allow the through holes that can function as the drain holes to be set in the recessed portions, and at the same time, to increase the rigidity of the left seat portion and the right seat portion, and to reliably suppress concentration of stress in the joint portion of the torsion beam and the reinforcing member.
Further, according to the structure of the fifth aspect of the present invention, the left plug welding hole is provided in the left seat portion and the right plug welding hole is provided in the right seat portion, whereby the welded portion can be set at a portion that is generally covered with the peripheral member on the upper side of the vehicle, and the occurrence of the situation where foreign matter such as chips and the like comes into contact with the welded portion while the vehicle is traveling can be reliably suppressed while suppressing the concentration of stress at the joint portion between the torsion beam and the reinforcing member.
Further, according to the structure of the sixth aspect of the present invention, the inner left mounting portion has a portion recessed toward the inner region so that a part thereof is away from the left plug hole, and the inner right mounting portion has a portion recessed toward the inner region so that a part thereof is away from the right plug hole, whereby it is possible to allow the through holes that can function as drain holes to be set in the recessed portions, and to increase the rigidity of the inner left mounting portion and the inner right mounting portion, thereby reliably suppressing concentration of stress in the joint portion of the torsion beam and the reinforcing member.
Further, according to the structure of the seventh aspect of the present invention, in the inner left mounting portion, the left flat wall portion is provided so as to be offset from the right end portion of the inner left mounting portion toward the outer left mounting portion and to be spaced apart from the connecting wall portion, the left flat wall portion is a portion where the inner left mounting portion is recessed toward the connecting wall portion, and the right end portion of the inner left mounting portion and the left flat wall portion are connected by the left inclined wall portion, and the inner right mounting portion is provided so as to be offset from the left end portion of the inner right mounting portion toward the outer right mounting portion and to be spaced apart from the connecting wall portion, and the right flat wall portion is a portion where the inner right mounting portion is recessed toward the connecting wall portion, and the left end portion of the inner right mounting portion and the right flat wall portion are connected by the right inclined wall portion, whereby the rigidity of the inner left mounting portion and the inner right mounting portion can be improved, and stress concentration at the joint portion of the torsion beam and the reinforcing member can be reliably suppressed.
Further, according to the structure of the eighth aspect of the present invention, the front portion of the right end portion and the rear portion of the right end portion of the left flat wall portion have right projecting portions projecting rightward, respectively, and the front portion of the left end portion of the right flat wall portion and the rear portion of the left end portion have left projecting portions projecting leftward, respectively, whereby the right end portion of the inner left mounting portion and the joining portion of the left end portion of the inner right mounting portion can be surrounded to improve their rigidity, and concentration of stress on the joining portion of the torsion beam and the reinforcing member can be suppressed more reliably.
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 rear view of the torsion beam type suspension in the present embodiment.
Fig. 3A is a partial bottom view of the torsion beam type suspension in the present embodiment.
Fig. 3B is an enlarged view of the plug weld hole of fig. 3A.
Fig. 4 is a cross-sectional view A-A of fig. 1.
Fig. 5 is a B-B cross-sectional view of fig. 1.
Fig. 6 is a cross-sectional view of a torsion beam type suspension according to a modification of the present embodiment, and corresponds in position to fig. 4.
Fig. 7 is a cross-sectional view of a torsion beam type suspension according to a modification of the present embodiment, and corresponds in position to fig. 5.
Description of the reference numerals
1. 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: a seat;
15: a concave setting part;
16: a through hole;
17: plug welding holes;
20. 120: a trailing arm;
30. 130: a reinforcing member;
31: a bottom wall portion;
32: a front flange;
33: a rear flange;
34: plug welding holes;
34a, 34b: arc;
34c, 34d: a connecting wire;
35: a flat wall portion;
36: an inclined wall portion;
37: a concave setting part;
38: a through hole;
39C: an intermediate portion;
39F: a front extension;
39R: a rear extension;
40: an outer mounting portion;
50: an inner mounting portion;
60: an intermediate connection portion;
80. 180: a spring seat;
90. 190: a shock absorber bracket;
100: a collar member;
110: a wheel supporting member;
w: a welding portion;
i: an interior region;
s: closing the section;
b1: a vehicle body mounting portion;
d1: a damper mounting portion;
w1: a wheel-side mounting portion;
s1: and a spring mounting portion.
Detailed Description
Hereinafter, a torsion beam type suspension according to an embodiment of the present invention including a modification will be described in detail with reference to fig. 1 to 7 as appropriate. In the figure, the x-axis, y-axis, and z-axis form a three-axis orthogonal coordinate system. The positive direction of the x-axis is the front direction of the vehicle body, the positive direction of the y-axis is the left direction of the vehicle body, and the positive direction of the z-axis is the upper direction of the vehicle body. The x-axis direction may be referred to as a longitudinal direction or a front-rear direction, the y-axis direction may be referred to as a width direction or a left-right direction, and the z-axis direction may be referred to as an 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 rear view of the torsion beam type suspension in the present embodiment, fig. 3A is a partial bottom view of the torsion beam type suspension in the present embodiment, and fig. 3B is an enlarged view of plug welding holes in fig. 3A. Fig. 4 is a sectional view A-A of fig. 1 (a longitudinal sectional view taken along a plane parallel to the y-z plane, i.e., a plane perpendicular to the longitudinal direction), and fig. 5 is a sectional view B-B of fig. 1 (a longitudinal sectional view taken along a plane parallel to the x-z plane, i.e., a plane perpendicular to the width direction). Fig. 6 is a cross-sectional view of the torsion beam type suspension according to the modification of the present embodiment, and corresponds to fig. 4 in position, and fig. 7 is a cross-sectional view of the torsion beam type suspension according to the modification of the present embodiment, and corresponds to fig. 5 in position. Fig. 1 to 7 each mainly show a left-side component of the torsion beam type suspension, and a right-side component of the torsion beam type suspension has a structure that is bilaterally symmetrical with respect to the left-side structure. In the drawings, for convenience of description, the right-side constituent elements of the torsion beam type suspension are denoted by brackets.
First, the structure of the torsion beam type suspension 1 in the present embodiment will be described in detail with reference to fig. 1 to 5.
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 left and right trailing arms 20, 120, and a pair of left and right reinforcements 30, 130. The torsion beam type suspension 1 may further include a pair of left and right spring seats 80 and 180 and a pair of left and right damper brackets 90 and 190.
The torsion beam 10 is typically a plate member made of a metal plate such as a steel plate having a shape protruding upward by press forming or the like, and the torsion beam 10 extends in the width direction and is welded to each other by arc welding or the like so as to connect the pair of left and right trailing arms 20, 120 at both end portions thereof.
Specifically, the torsion beam 10 includes, in a vertical cross section taken in a plane perpendicular to the width direction, front and rear vertical wall portions 11 and 12 facing each other in the front-rear direction, and an upper wall portion 13, the upper wall portion 13 connecting upper end portions of the front and rear vertical wall portions 11 and 12 in the front-rear direction, and being provided with a seat portion 14 protruding upward, and the torsion beam 10 defines an inner region I surrounded by the front vertical wall portion 11, the rear vertical wall portion 12, and the upper wall portion 13, and has an open cross section shape that opens downward. Typically, the front vertical wall 11 is slightly inclined forward from the upper wall 13, and the rear vertical wall 12 is slightly inclined rearward from the upper wall 13. Further, typically, in the case where the torsion beam type suspension 1 receives a static load generated by the vehicle weight, the upper wall portion 13 can be considered to be substantially in the horizontal position. The torsion beam 10 may have an open cross-sectional shape that opens obliquely downward forward or obliquely downward backward, as required. The lower end portions of the front vertical wall portion 11 and the rear vertical wall portion 12 are typically set to gradually descend downward from the widthwise central portion toward the left in relation to the desired torsion characteristics of the torsion beam 10.
Here, the torsion beam type suspension 1 typically has a substantially laterally symmetrical shape with respect to a center plane perpendicular to the width direction and passing through the widthwise center, and therefore the torsion beam 10 has a laterally symmetrical shape with respect to the center plane, and the seat portion 14 is also provided as a pair of laterally symmetrical members on the upper wall portion 13. 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, 190 will be representatively described with reference to the left trailing arm 20, the left reinforcement 30, the left spring seat 80, and the left shock absorber bracket 90 as examples.
The left trailing arm 20 is typically 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, the left trailing arm 20 is welded at its front end portion with a collar member 100 formed by rolling a metal plate such as a steel plate, typically for supporting a vehicle body, by arc welding or the like, and is welded at its rear end portion with a metal wheel supporting member 110 such as a typical steel plate for supporting a wheel, typically inserted in a part thereof by arc welding or the like. In addition, the left trailing arm 20 may be configured as follows: the left trailing arm 20 may be formed of a single metal pipe member such as a steel pipe, or the like, by preparing two members each having a substantially U-shaped longitudinal section and welding the two members by arc welding or the like so that the members face each other in the width direction or the vertical direction. The wheel supporting member 110 may be welded by arc welding or the like so as to abut only the rear end portion of the left trailing arm 20.
The left reinforcement 30 is typically a plate member formed of a metal plate such as a steel plate formed by press forming 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 and right end portions thereof are welded in correspondence with the torsion beam 10 and the left trailing arm 20, respectively, to connect them.
Specifically, the left stiffener 30 includes a bottom wall 31 that is a main body of a molded product, a front flange 32 that is erected downward from a front end portion of the bottom wall 31, and a rear flange 33 that is erected downward 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.
The left reinforcement 30 includes an outer mounting portion 40 as a left end portion on the outside of the left end of the torsion beam 10. The outer mounting portion 40 typically has a cutout portion that is cut out so as to be shaped along the outer contour shape of the left trailing arm 20, and is welded thereto by arc welding or the like so as to abut against the outer peripheral surface of the left trailing arm 20.
The left reinforcement 30 further includes an inner attachment portion 50 as a right end portion in the torsion beam 10. The inner mounting portion 50 has: a right end portion of the bottom wall portion 31 formed in a shape along the shape of 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 in a shape along the shape of the inner wall surface of the front vertical wall portion 11 of the torsion beam 10; and a right end portion of the rear flange 33 formed in a shape along the shape of the inner wall surface of the rear vertical wall portion 12 of the torsion beam 10.
Here, the right end portion of the bottom wall portion 31 in the inner attachment portion 50 is provided with a welded portion W corresponding to the seat portion 14 provided in the upper wall portion 13 of the torsion beam 10, and the right end portion of the bottom wall portion 31 is welded in contact with the seat portion 14 at the welded portion W. The seat portion 14 is a portion where the upper wall portion 13 protrudes in a protruding direction (upward direction) away from the inner region I of the torsion beam 10, and thus, when the torsion beam 10 and the left trailing arm 20 are connected by the left reinforcement 30, the rigidity of the upper wall portion 13 including the seat portion 14 can be improved, and the force to be applied to the welded portion W that is the joining portion of the torsion beam 10 and the left reinforcement 30 can be dispersed, whereby the torsion characteristics of the torsion beam 10 can be set with a high degree of freedom so that the joining strength of the torsion beam 10 and the left trailing arm 20 and the bending rigidity of the torsion beam 10 are ensured, and the concentration of stress on the welded portion W of the torsion beam 10 and the left reinforcement 30 is suppressed. Further, from the viewpoint of dispersing the force to be applied to the welded portion W more, it is preferable that the front end portion and the rear end portion of the seat portion 14 are directly connected to the front vertical wall portion 11 and the rear vertical wall portion 12 in correspondence with each other, and the seat portion 14 extends to the front vertical wall portion 11 and the rear vertical wall portion 12.
Further, from the viewpoint of reliably suppressing concentration of stress on the welded portion W of the torsion beam 10 and the left reinforcement 30, the welded portion W is preferably disposed in the plug welding hole 34 provided in correspondence with the seat portion 14 by perforating the right end portion of the bottom wall portion 31 of the inner attachment portion 50. By providing the plug welding hole 34 in the bottom wall portion 31, it is possible to suppress concentration of stress in the welded portion W between the torsion beam 10 and the left reinforcement 30, and to set the welded portion W on the side of the left reinforcement 30 generally directed downward, and to suppress occurrence of dust, moisture, and the like from being trapped in the welded portion W. The welded portion W is a plug welded portion formed by welding at least the peripheral wall portion of the plug welded hole 34 and the lower wall surface portion of the seat portion 14 by arc welding or the like, and the entire plug welded hole 34 may be filled with a welding material as needed. Further, from the viewpoint of more reliably suppressing stress concentration on the welded portion W of the torsion beam 10 and the left reinforcement 30, the plug welding hole 34 is preferably a long hole as follows: a pair of circular arcs 34a, 34b opposed to each other in a predetermined direction X perpendicular to the upward direction, which is the protruding direction of the seat 14, are connected by a pair of connecting lines 34c, 34d opposed to each other, and the diameters of the pair of circular arcs 34a, 34b are different. The predetermined direction X is determined based on the following viewpoints: stress balance is achieved at the welded portion W and the periphery of the plug welding hole 34, and the force to be applied to the welded portion W, which is the joining portion of the torsion beam 10 and the left reinforcement 30, is dispersed. Further, typically, the centers C1, C2 of the pair of circular arcs 34a, 34b are arranged on a straight line L parallel to the direction X, which is a direction in which stress generated in the torsion beam when the torsion beam 10 is twisted (particularly, when both ends in the width direction of the torsion beam 10 are twisted in opposite directions), is a direction intersecting the front-rear direction, typically, the pair of connecting lines 34C, 34d are straight lines or curves protruding outward of the plug hole 34, and the shape of the plug hole 34 is set to be a shape that is line-symmetrical with respect to the straight line L such that the tip end of the water droplet is rounded. From the viewpoint of obtaining stress balance around the plug hole 34, the small-diameter arc of the pair of arcs 34a, 34b is preferably disposed closer to either the front vertical wall 11 or the rear vertical wall 12 than the large-diameter arc of the pair of arcs 34a, 34 b.
Further, the seat portion 14 preferably has a recess setting portion 15 recessed toward the inner region I in such a manner that a part thereof enters the plug welding hole 34. This allows the through hole 16, which can function as a drain hole, to be set in the recess setting portion 15, and at the same time, the rigidity of the seat portion 14 is improved, and the concentration of stress on the welded portion W between the torsion beam 10 and the left reinforcement 30 can be reliably suppressed. Further, from the viewpoint of further improving the rigidity of the seat portion 14, the recess portion 15 is preferably surrounded along the peripheral wall portion of the plug welding hole 34.
Further, it is preferable that the inner mounting portion 50 is provided with a flat wall portion 35 so as to be spaced apart from the upper wall portion 13 at a position offset from the right end portion of the bottom wall portion 31 toward the outer mounting portion 40, the flat wall portion 35 being a portion where the inner mounting portion 50 is recessed toward the upper wall portion 13, and the right end portion of the inner mounting portion 50 and the flat wall portion 35 are connected by an inclined wall portion 36. This can enhance the rigidity of the inner attachment portion 50 and reliably suppress stress concentration in the welded portion W between the torsion beam 10 and the left reinforcement 30.
The flat wall portion 35 preferably has a front protruding portion 39F and a rear protruding portion 39R protruding rightward from the middle portion 39C, respectively, at a front portion of the right end portion and a rear portion of the right end portion. This can further improve the rigidity of the welded portion W at the right end portion of the inner attachment portion 50 by surrounding the welded portion W, and disperse the force applied to the welded portion W between the torsion beam 10 and the left reinforcement 30.
The left reinforcement 30 further includes 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 extending in the width direction while gradually rising from the outer mounting portion 40 toward the inner mounting portion 50. By adopting such a diagonal portion in 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 in the portion where the shape of the torsion beam 10 changes can be relaxed.
Further, from the viewpoints of improving the strength and bending rigidity of the torsion beam 10 and improving the joining strength of the torsion beam 10 and the left trailing arm 20, the torsion beam 10 and the left reinforcement 30 cooperate to define a closed cross-section portion S that is set to extend between the outer mounting portion 40 and the inner mounting portion 50 with the intermediate connecting portion 60 interposed therebetween.
In the left reinforcement 30, the front flange 32 and the rear flange 33 may be welded by arc welding or the like so as to abut against the inner wall surface of the front vertical wall portion 11 and the inner wall surface of the rear vertical wall portion 12 of the torsion beam 10 corresponding to each other.
The left spring seat 80 is typically a plate member made of a metal plate such as a steel plate formed by press forming or the like, welded to the torsion beam 10 and the left trailing arm 20 by arc welding or the like, and supports the lower end portion of the spring.
The damper bracket 90 is typically a plate member made of a metal plate such as a steel plate formed by press forming or the like, welded to the left trailing arm 20 and the left spring seat 80 by arc welding or the like, and supports the lower end portion of the damper.
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 to which the wheel side member is mounted, the spring mounting portion S1 to which the spring is mounted, and the damper mounting portion D1 to which the damper is mounted 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 mounted on the vehicle body by being fastened by a fastening member such as a typical bolt, not shown, through a bushing member, 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 typical bearing member, which is not shown, is fastened to the wheel supporting member 110 by a fastening member, such as a bolt, which is not shown.
The spring mounting portion S1 is disposed corresponding to the bottom wall portion of the left spring seat 80. In the spring mounting portion S1, a spring, not shown, is mounted on an upper surface portion of a bottom wall portion of the left spring seat 80. In order to reduce friction sound of the spring, a disk-shaped elastic member may be placed on the bottom wall portion, and the spring may be placed thereon.
The damper mounting portion D1 is disposed corresponding to the left side wall portion of the damper bracket 90 and the right side wall portion of the left spring seat 80. In the damper mounting portion D1, a lower end portion of the damper, which is not shown, is fastened by a fastening member such as a typical bolt, which is not shown, through holes provided in the left side wall portion and the right side wall portion, respectively, and is mounted.
The above-mentioned various wheel supporting members and nut members are typically made of metal such as steel.
Next, a modification of the torsion beam type suspension 1 in the present embodiment will be described in detail with reference to fig. 6 and 7.
As shown in fig. 6 and 7, the torsion beam type suspension 1' of the present modification is mainly different from the torsion beam type suspension 1 described above in that the member provided with the plug welding hole is changed and the remaining structure is the same in principle. In the following, the structure of the present modification will be representatively described taking the left reinforcement 30 and the related structure thereof as an example, focusing on the differences.
Specifically, in the torsion beam type suspension 1' of the present modification, the seat portion 14 provided to the upper wall portion 13 of the torsion beam 10 is perforated to provide the plug welding hole 17, and the welding portion W, at which the right end portion of the bottom wall portion 31 of the inner mounting portion 50 in the left reinforcement 30 is welded by abutting against the seat portion 14, is disposed in the plug welding hole 17. By providing the plug welding hole 17 to the seat portion 14, the welding portion W can be set at a location surrounded by the peripheral member on the upper side of the vehicle in general, and the occurrence of contact between foreign matter such as chips and the welding portion during running of the vehicle can be suppressed. The plug-welded hole 17 has a configuration that has the same shape as the plug-welded hole 34 provided in the bottom wall 31 of the inner attachment portion 50.
Further, the inner mounting portion 50 preferably has a recess setting portion 37 recessed toward the inner region I in such a manner that a part thereof is away from the plug welding hole 17. This allows the through hole 38 that can function as a drain hole to be set in the recess setting portion 37, and improves the rigidity of the inner attachment portion 50, thereby improving the reliability of welding between the torsion beam 10 and the reinforcing member. The recess setting portion 37 has a structure that takes on the same shape and the like as the recess setting portion 15 provided in the seat portion 14.
According to the torsion beam type suspension 1, 1' of the present embodiment including the modification described above, the welded portion W is set corresponding to the seat portion 14 provided to the upper wall portion 13 of the torsion beam 10, and the right end portion of the bottom wall portion 31 in the inner mounting portion 50 of the left reinforcement 30 is welded in contact with the seat portion 14 at the welded portion W. The seat portion 14 is a portion of the upper wall portion 13 protruding in a protruding direction (upward direction) away from the inner region I of the torsion beam 10, and thus, when the torsion beam 10 and the left trailing arm 20 are connected by the left reinforcement 30, the rigidity of the upper wall portion 13 including the seat portion 14 can be improved, and the force to be applied to the welded portion W that is the joining portion of the torsion beam 10 and the left reinforcement 30 can be dispersed, whereby the torsion characteristics of the torsion beam 10 can be set with a high degree of freedom so that the joining strength of the torsion beam 10 and the left trailing arm 20 and the bending rigidity of the torsion beam 10 are ensured, and the concentration of stress on the welded portion W of the torsion beam 10 and the left reinforcement 30 is suppressed.
Further, according to the torsion beam type suspension 1, 1' of the present embodiment including the modification, the welded portion W is disposed in the plug hole 34 provided by perforating the right end portion of the bottom wall portion 31 in the inner mounting portion 50 of the left reinforcement 30 so as to correspond to the seat portion 14, or in the plug hole 17 by perforating the seat portion 14 provided in the upper wall portion 13 of the torsion beam 10. When the plug welding hole 34 is provided in the bottom wall 31, the welding portion W can be set on the left stiffener 30 side which is generally directed downward, in addition to the force to be applied to the welding portion W being able to be dispersed reliably, and the occurrence of dust, moisture, and the like being able to be suppressed from being trapped on the welding portion W. In addition, when the plug welding hole 17 is provided in the seat portion 14, the force to be applied to the welding portion W can be reliably dispersed, and the welding portion W can be set at a position surrounded by the peripheral member generally on the upper side of the vehicle, and the occurrence of contact between foreign matter such as debris during running of the vehicle and the welding portion can be suppressed.
In the present invention, the types, shapes, arrangements, and numbers of components are not limited to the above embodiments, and the components may be replaced with components having equivalent functions and effects, as appropriate, without departing from the spirit of the present invention.
As described above, in the present invention, the following torsion beam type suspension can be provided: when the torsion beam and the trailing arm are connected by the reinforcing member, the torsion characteristics of the torsion beam can be set with a high degree of freedom so that the joining strength between the torsion beam and the trailing arm and the bending rigidity of the torsion beam are ensured and the concentration of stress at the joining portion between the torsion beam and the reinforcing member is suppressed, and therefore, the torsion beam type suspension is expected to be widely used in the field of torsion beam type suspensions for mobile bodies such as vehicles according to its general properties.
Claims (8)
1. A torsion beam suspension, comprising:
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, is supported by the vehicle body on a front side in the longitudinal direction, and supports wheels on a rear side in the longitudinal direction;
a right trailing arm extending in the longitudinal direction on the right side in the width direction, supported by the vehicle body on the front side in the longitudinal direction, and supporting a wheel on the rear side in the longitudinal direction;
a torsion beam extending in the width direction, having an open cross-sectional shape having a pair of wall portions facing each other and a connecting wall portion connecting the pair of wall portions, and connecting the left trailing arm and the right trailing arm in a longitudinal section taken along a plane perpendicular to the width direction;
a left reinforcement extending in the width direction on the left side, and having: an inner left 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; an outer left mounting portion mounted to the left trailing arm; and a middle left connecting portion connecting the inner left mounting portion and the outer left mounting portion, the left reinforcing member connecting the torsion beam and the left trailing arm; and
a right reinforcement extending in the width direction on the right side, and having: an inner right mounting portion mounted to the torsion beam in the inner region; an outer right mounting portion mounted to the right trailing arm; and a middle right connecting portion connecting the inner right mounting portion and the outer right mounting portion, the right reinforcing member connecting the torsion beam and the right trailing arm,
wherein,,
the torsion beam has, in the connecting wall portion: a left seat portion provided with a left welding portion where the inner left mounting portion is welded to the connection wall portion; and a right seat portion provided with a right welding portion where the inner right mounting portion is welded to the connection wall portion,
the left seat portion is a portion of the connecting wall portion protruding in a protruding direction away from the inner region,
the right seat portion is a portion of the connection wall portion protruding in the protruding direction.
2. The torsion beam type suspension according to claim 1, wherein,
the left welding part is arranged at a left plug welding hole arranged at one of the connecting wall part and the inner left mounting part,
the left plug welding hole is a pair of long holes having different diameters of circular arcs opposite to each other in a direction perpendicular to the protruding direction,
the right welding part is arranged at a right plug welding hole arranged at one of the connecting wall part and the inner right mounting part,
the right plug welding hole is a pair of long holes having different diameters of circular arcs facing each other in a direction perpendicular to the protruding direction.
3. The torsion beam type suspension according to claim 2, wherein,
the left plug welding hole is arranged at the inner left mounting part,
the right plug welding hole is arranged at the inner right mounting part.
4. The torsion beam type suspension according to claim 3, wherein,
the left seat portion has a portion concavely disposed toward the inner region in such a manner that a portion thereof enters the left plug welding hole,
the right seat portion has a portion concavely disposed toward the inner region in such a manner that a portion thereof enters the right plug welding hole.
5. The torsion beam type suspension according to claim 2, wherein,
the left plug welding hole is arranged on the left seat part,
the right plug welding hole is formed in the right seat portion.
6. The torsion beam type suspension according to claim 3, wherein,
the inner left mounting portion has a portion concavely disposed toward the inner region with a portion thereof away from the left plug welding hole,
the inner right mounting portion has a portion concavely disposed toward the inner region with a portion thereof away from the right plug welding hole.
7. The torsion beam type suspension according to claim 1, wherein,
a left flat wall portion is provided on the inner left mounting portion so as to face the outer left mounting portion apart from the connecting wall portion while being offset from a right end portion of the inner left mounting portion, the left flat wall portion being a portion of the inner left mounting portion recessed toward the connecting wall portion, and the right end portion of the inner left mounting portion and the left flat wall portion are connected by a left inclined wall portion,
the inner right mounting portion is provided with a right flat wall portion which is a portion of the inner right mounting portion recessed toward the connecting wall portion so as to face the connecting wall portion apart from the left end portion of the inner right mounting portion toward the outer right mounting portion, and the left end portion of the inner right mounting portion and the right flat wall portion are connected by a right inclined wall portion.
8. The torsion beam type suspension according to claim 7, wherein,
the front side portion of the right end portion and the rear side portion of the right end portion of the left flat wall portion have right protruding portions protruding toward the right side respectively,
the front portion of the left end portion and the rear portion of the left end portion of the right flat wall portion have left protruding portions that protrude to the left side, respectively.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-068055 | 2019-03-29 | ||
| JP2019068055A JP7170577B2 (en) | 2019-03-29 | 2019-03-29 | torsion beam suspension |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111746216A CN111746216A (en) | 2020-10-09 |
| CN111746216B true CN111746216B (en) | 2023-05-30 |
Family
ID=72672803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010217216.9A Active CN111746216B (en) | 2019-03-29 | 2020-03-25 | Torsion beam type suspension |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP7170577B2 (en) |
| CN (1) | CN111746216B (en) |
| BR (1) | BR102020006193A2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6749850B2 (en) * | 2017-01-17 | 2020-09-02 | 日野自動車株式会社 | Support beam |
| KR20230172296A (en) * | 2022-06-15 | 2023-12-22 | 현대자동차주식회사 | Reinforcing structure of the suspension |
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|---|---|---|---|---|
| JP2007153099A (en) * | 2005-12-05 | 2007-06-21 | Honda Motor Co Ltd | Torsion beam type suspension |
| KR20100056887A (en) * | 2008-11-20 | 2010-05-28 | 현대자동차주식회사 | Rear suspension of coupled torsion beam axle type |
| CN104786773A (en) * | 2014-01-21 | 2015-07-22 | 本特勒尔汽车技术有限公司 | Vehicle axle |
| CN105644296A (en) * | 2014-11-28 | 2016-06-08 | 铃木株式会社 | Torsion beam suspension structure for vehicle |
| CN105936200A (en) * | 2015-03-02 | 2016-09-14 | 铃木株式会社 | Torsion beam-type suspension |
| CN107867141A (en) * | 2016-09-27 | 2018-04-03 | 三菱自动车工业株式会社 | Twist-beam suspension and the stiffener for twist-beam suspension |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001039135A (en) * | 1999-07-29 | 2001-02-13 | Nissan Motor Co Ltd | Torsion beam type suspension |
| EP2596968B1 (en) * | 2010-07-23 | 2016-01-20 | Honda Motor Co., Ltd. | Torsion beam type suspension device |
| JP6363402B2 (en) * | 2014-06-03 | 2018-07-25 | フタバ産業株式会社 | Torsion beam suspension |
| DE112016000550B4 (en) * | 2015-01-30 | 2020-12-24 | Futaba Industrial Co. Ltd. | Twist beam suspension |
| JP2016168953A (en) * | 2015-03-13 | 2016-09-23 | フタバ産業株式会社 | Torsion beam-type suspension |
| DE102015209039A1 (en) * | 2015-05-18 | 2016-11-24 | Volkswagen Aktiengesellschaft | Twist-beam rear axle for a motor vehicle and motor vehicle with such a torsion beam rear axle |
| JP6530691B2 (en) * | 2015-09-30 | 2019-06-12 | 三菱自動車工業株式会社 | Torsion beam type suspension and reinforcement member used therefor |
| CN109476198A (en) * | 2016-07-15 | 2019-03-15 | 麦格纳国际公司 | Vehicle torsion shaft assembly |
-
2019
- 2019-03-29 JP JP2019068055A patent/JP7170577B2/en active Active
-
2020
- 2020-03-25 CN CN202010217216.9A patent/CN111746216B/en active Active
- 2020-03-27 BR BR102020006193-3A patent/BR102020006193A2/en unknown
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007153099A (en) * | 2005-12-05 | 2007-06-21 | Honda Motor Co Ltd | Torsion beam type suspension |
| KR20100056887A (en) * | 2008-11-20 | 2010-05-28 | 현대자동차주식회사 | Rear suspension of coupled torsion beam axle type |
| CN104786773A (en) * | 2014-01-21 | 2015-07-22 | 本特勒尔汽车技术有限公司 | Vehicle axle |
| EP2896522A1 (en) * | 2014-01-21 | 2015-07-22 | Benteler Automobiltechnik GmbH | Motor vehicle axle |
| CN105644296A (en) * | 2014-11-28 | 2016-06-08 | 铃木株式会社 | Torsion beam suspension structure for vehicle |
| CN105936200A (en) * | 2015-03-02 | 2016-09-14 | 铃木株式会社 | Torsion beam-type suspension |
| CN107867141A (en) * | 2016-09-27 | 2018-04-03 | 三菱自动车工业株式会社 | Twist-beam suspension and the stiffener for twist-beam suspension |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7170577B2 (en) | 2022-11-14 |
| BR102020006193A2 (en) | 2020-12-01 |
| CN111746216A (en) | 2020-10-09 |
| JP2020164092A (en) | 2020-10-08 |
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