CN111746216A - Torsion beam type suspension - Google Patents
Torsion beam type suspension Download PDFInfo
- Publication number
- CN111746216A CN111746216A CN202010217216.9A CN202010217216A CN111746216A CN 111746216 A CN111746216 A CN 111746216A CN 202010217216 A CN202010217216 A CN 202010217216A CN 111746216 A CN111746216 A CN 111746216A
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- Prior art keywords
- torsion beam
- wall portion
- trailing arm
- plug
- mounting
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- 239000000725 suspension Substances 0.000 title claims abstract description 51
- 238000003466 welding Methods 0.000 claims abstract description 78
- 230000002787 reinforcement Effects 0.000 claims description 44
- 230000003014 reinforcing effect Effects 0.000 claims description 20
- 239000002184 metal Substances 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 10
- 230000004048 modification Effects 0.000 description 10
- 238000012986 modification Methods 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 238000005452 bending Methods 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 6
- 239000006096 absorbing agent Substances 0.000 description 5
- 230000035939 shock Effects 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 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
- 230000014759 maintenance of location 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
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
- B60G21/02—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected
- B60G21/04—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically
- B60G21/05—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically between wheels on the same axle but on different sides of the vehicle, i.e. the left and right wheel suspensions being interconnected
- B60G21/051—Trailing arm twist beam axles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
- B60G21/02—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected
- B60G21/04—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically
- B60G21/05—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically between wheels on the same axle but on different sides of the vehicle, i.e. the left and right wheel suspensions being interconnected
- 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 invention provides a torsion beam type suspension, in the torsion beam type suspension, a welding part is set corresponding to a seat part arranged on an upper wall part of a torsion beam, a bottom wall part is abutted against the seat part and is welded at the welding part, and the seat part is a part of the upper wall part which is arranged in a protruding direction (an upper direction) far away 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-wheel motor vehicle.
Background
In recent years, torsion beam type suspensions having a small number of parts, a relatively simple structure, and excellent space efficiency have been widely used for suspension devices for vehicles such as four-wheel vehicles, mainly for small displacement vehicles and the like.
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 in which the left and right trailing arms and the torsion beam are coupled by a reinforcing member extending inside the torsion beam has been proposed.
In this case, european patent application publication No. 2896522, which relates to a vehicle axle 1, discloses the following structure: the vehicle axle 1 includes: two vertical support bodies (trailing arms) 3 arranged along the longitudinal direction of the vehicle; a cross support body 2 that extends in the lateral direction of the vehicle and couples the two trailing arms 3 to each other; and a reinforcing piece 4 that couples the two trailing arms 3 and the lateral support body 2, respectively, wherein a spot-like coupling portion 11 such as plug welding that couples the bottom web 7 of the metal profile 5 of the lateral support body 2 and the reinforcing piece 4 is provided in a terminal region 10 of the reinforcing piece 4 on the lateral support body 2 side.
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, the point-like joint 11 is provided, and the force acting on the joint is distributed more favorably, so that the stress generated in the terminal region 10 on the lateral support body 2 side of the reinforcing sheet 4 is intended to be reduced, but the point-like joint 11 is disposed with respect to an ellipse or an elongated hole extending in the longitudinal direction of the vehicle and is joined to the flat bottom web 7 in the metal profile 5 of the lateral support body 2, and therefore the degree of reduction of the stress naturally has a limit, and there is room for improvement in this point.
Further, according to the studies of the present inventors, in the torsion beam type suspension, it is required to optimize the torsional rigidity of the torsion beam while securing the joint strength between the torsion beam and the trailing arm and the bending rigidity of the torsion beam, but when the torsion beam and the trailing arm are connected by the reinforcing member in order to enhance the joint strength between them 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 at the joint portion between the torsion beam and the reinforcing member becomes strong. That is, this case limits the degree of freedom in design in optimizing the torsional rigidity of the torsion beam to a low level, and therefore, it is currently desired to realize a new configuration that improves the degree of freedom in design in optimizing the torsional rigidity of the torsion beam.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a torsion beam type suspension that can set torsion characteristics of a torsion beam with a high degree of freedom so as to suppress stress concentration at a joint portion between the torsion beam and a reinforcing member while securing joint strength between the torsion beam and a trailing arm and bending rigidity of the torsion beam when the torsion beam and the trailing arm are connected by the reinforcing member.
In order to achieve the above object, a torsion beam type suspension in a first aspect of the invention includes: a left trailing arm that extends in a longitudinal direction of a vehicle body on a left side in a width direction of the vehicle body, is supported by the vehicle body on a front side in the longitudinal direction, and supports a wheel on a rear side in the longitudinal direction; a right trailing arm that extends in the longitudinal direction on the right side in the width direction, is supported by the vehicle body on the front side in the longitudinal direction, and supports a wheel on the rear side in the longitudinal direction; a torsion beam that extends in the width direction, has an open cross-sectional shape having a pair of wall portions that face each other and a connecting wall portion that connects between the pair of wall portions, in a longitudinal cross section taken along a plane perpendicular to the width direction, and connects the left trailing arm and the right trailing arm; 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; the middle left connecting part is used for connecting the inner left mounting part and the outer left mounting part, and the left reinforcing piece is used for 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 the inner right mounting portion and the outer right mounting portion, the right reinforcement linking the torsion beam and the right trailing arm, the torsion beam having in the connecting wall portion: a left seat portion configured with a left welding portion at which the inner left mounting portion is welded to the connecting wall portion; and a right seat portion to which a right welding portion is disposed, the inner right attachment portion being welded to the connecting wall portion, the left seat portion being a portion of the connecting wall portion protruding in a protruding direction away from the inner region, and the right seat portion being a portion of the connecting wall portion protruding in the protruding direction.
Further, the present invention, in addition to the first aspect, is characterized in that the left welding portion is disposed in a left plug welding hole provided in one of the connecting wall portion and the inner left mounting portion, the left plug welding hole being a long hole having different diameters of a pair of arcs facing each other in a direction perpendicular to the protruding direction, the right welding portion being disposed in a right plug welding hole provided in one of the connecting wall portion and the inner right mounting portion, the right plug welding hole being a long hole having different diameters of a pair of arcs facing each other in the direction perpendicular to the protruding direction.
In addition, the present invention is, in the second aspect, a third aspect, wherein 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.
In addition, the present invention is, in the third aspect, a fourth aspect, characterized in that the left seat portion has a portion recessed toward the inner region such that a portion thereof enters the left plug welding hole, and the right seat portion has a portion recessed toward the inner region such that a portion thereof enters the right plug welding hole.
In addition, the present invention provides a fifth aspect wherein 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.
In addition, the present invention according to a sixth aspect is the internal left mounting part having a portion recessed toward the internal region so that a portion thereof is away from the left plug weld hole, and the internal right mounting part having a portion recessed toward the internal region so that a portion thereof is away from the right plug weld hole.
Further, the present invention, in addition to any one of the first to sixth aspects, is a seventh aspect in that, a left flat wall portion is provided on the inner left attachment portion so as to be offset from a right end portion of the inner left attachment portion toward the outer left attachment portion and so as to be opposed to the connection wall portion in a manner of being separated from the connection 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 a left inclined wall portion, a right flat wall portion is provided on the inner right mounting portion so as to be offset from a left end portion of the inner right mounting portion toward the outer right mounting portion and so as to be opposed to the connecting wall portion in a spaced-apart manner, 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.
In addition, the present invention according to an eighth aspect is the seventh aspect, wherein the front portion of the right end portion of the left flat wall portion and the rear portion of the right end portion have right protruding portions protruding to the right side, 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 protruding portions protruding to the left side, respectively.
According to the structure of the first aspect of the invention, the torsion beam has, in the connecting wall portion: a left seat portion configured with a left welding portion where an inner left mounting portion of the left reinforcement is welded to the connecting wall portion; and a right seat portion in which a right welding portion is disposed, wherein an inner right mounting portion of the right reinforcement is welded to the connecting wall portion, the left seat portion is a portion in which the connecting wall portion is provided so as to protrude in a protruding direction away from an inner region of the torsion beam, and the right seat portion is a portion in which the connecting wall portion is provided so as to protrude in a protruding direction away from an inner region of the torsion beam.
Further, according to the structure in the second aspect of the invention, the left welding portion is disposed at the left plug welding hole provided at one of the connecting 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 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 connecting 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 arcs opposed to each other in the direction perpendicular to the protruding direction, whereby it is possible to reliably suppress concentration of stress at the joint portion of the torsion beam and the reinforcement member, while highly freely setting the torsion characteristics of the torsion beam.
Further, according to the configuration of the third aspect of the present invention, since 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, it is possible to set the welded portion on the left reinforcement and the right reinforcement side which face generally downward of the vehicle, and it is possible to reliably suppress concentration of stress at the joint portion between the torsion beam and the reinforcement member and to suppress occurrence of retention of dust, moisture, and the like in the welded portion.
Further, according to the configuration of the fourth aspect of the present invention, since 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, it is possible to increase the rigidity of the left seat portion and the right seat portion while allowing through holes functioning as drain holes to be set in these recessed portions, and to reliably suppress stress concentration at the joint portion between the torsion beam and the reinforcing member.
Further, according to the configuration of the fifth aspect of the present invention, since 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, it is possible to set the welded portion at a portion generally covered with the peripheral member on the relatively upper side of the vehicle, and it is possible to reliably suppress concentration of stress at the joint portion between the torsion beam and the reinforcing member and to suppress occurrence of contact between the welded portion and foreign matter such as debris during traveling of the vehicle.
Further, according to the configuration of the sixth aspect of the present invention, since the inner left mounting portion has a portion recessed toward the inner region so that a part thereof is away from the left plug weld 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 weld hole, it is possible to increase the rigidity of the inner left mounting portion and the inner right mounting portion while allowing through holes that can function as drain holes to be set in these recessed portions, and to reliably suppress stress concentration at the joint portion between the torsion beam and the reinforcing member.
Further, according to the structure in the seventh aspect of the invention, in the inner left mounting portion, a left flat wall portion is provided in such a manner as to be offset to the outer left mounting portion side from the right end portion of the inner left mounting portion and as to be opposed to the connecting wall portion in a spaced-apart manner, the left flat wall portion is a portion where the inner left mounting portion is recessed toward the connecting wall portion, and a right end portion of the inner left mounting portion and the left flat wall portion are connected by a left inclined wall portion, a right flat wall portion provided on the inner right mounting portion so as to be offset from a left end portion of the inner right mounting portion toward the outer right mounting portion and so as to be opposed to the connecting wall portion in a spaced-apart manner, the right flat wall portion is a portion where the inner right mounting portion is recessed toward the connecting wall portion, and a left end portion of the inner right mounting portion and the right flat wall portion are connected by a right inclined wall portion, this improves the rigidity of the inner left and right mounting portions, and reliably suppresses stress concentration at the joint portion between the torsion beam and the reinforcing member.
Further, according to the configuration of the eighth aspect of the present invention, the front portion of the right end portion of the left flat wall portion and the rear portion of the right end portion have the right protruding portion protruding to the right side, 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 the left protruding portion protruding to the left side, respectively, whereby the right end portion of the inner left mounting portion and the left end portion of the inner right mounting portion can be surrounded to improve the rigidity thereof, and the concentration of stress at the joint portion of the torsion beam and the reinforcing member can be more reliably suppressed.
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 in fig. 3A.
Fig. 4 is a sectional view a-a of fig. 1.
Fig. 5 is a sectional view B-B 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 symbols
1. 1': a torsion beam type suspension;
10: a torsion beam;
11: a front longitudinal wall portion;
12: a rear longitudinal wall portion;
13: an upper wall portion;
14: a seat portion;
15: a recessed setting part;
16: a through hole;
17: plugging the welding hole;
20. 120: a trailing arm;
30. 130, 130: a reinforcement;
31: a bottom wall portion;
32: a front flange;
33: a rear flange;
34: plugging the welding hole;
34a, 34 b: a circular arc;
34c, 34 d: a connecting wire;
35: a flat wall portion;
36: an inclined portion;
37: a recessed setting part;
38: a through hole;
39C: an intermediate portion;
39F: a front extension portion;
39R: a rear extension;
40: an outer mounting portion;
50: an inner mounting portion;
60: an intermediate connecting portion;
80. 180: a spring seat;
90. 190: a shock absorber support; 100: a collar member;
110: a wheel supporting member;
w: a welding portion;
i: an interior region;
s: a closed cross-sectional portion;
b1: a vehicle body mounting section;
d1: a damper mounting portion;
w1: a wheel-side mounting portion;
s1: 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 constitute a three-axis orthogonal coordinate system. The positive direction of the x-axis is the forward 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 is sometimes referred to as a longitudinal direction or a front-rear direction, the y-axis direction is sometimes referred to as a width direction or a left-right direction, and the z-axis direction is sometimes 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 a plug weld hole in fig. 3A. Fig. 4 is a sectional view taken along 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 taken along 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 sectional view of a torsion beam type suspension according to a modification of the present embodiment, and corresponds in position to fig. 4, and fig. 7 is a sectional view of a torsion beam type suspension according to a modification of the present embodiment, and corresponds in position to fig. 5. In addition, 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 explanation, the right-hand constituent elements of the torsion beam type suspension are indicated by parentheses.
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 attached to a vehicle body such as a rear side frame of an automobile or the like, not shown, and supports a suspension spring (hereinafter referred to as a spring), a suspension damper (hereinafter referred to as a damper), 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 include a pair of left and right spring seats 80, 180 and a pair of left and right damper brackets 90, 190.
The torsion beam 10 is typically a plate member made of a metal plate such as a steel plate that is formed into an upwardly convex shape by press forming or the like, and the torsion beam 10 extends in the width direction and is welded to each other by arc welding or the like, whereby the pair of left and right trailing arms 20, 120 are coupled at both ends thereof.
More specifically, the torsion beam 10 includes, in a longitudinal section cut along a plane perpendicular to the width direction, a front longitudinal wall portion 11 and a rear longitudinal wall portion 12 that are opposed to each other in the front-rear direction, and an upper wall portion 13 that connects upper end portions of the front longitudinal wall portion 11 and the rear longitudinal wall portion 12 in the front-rear direction and is provided with a seat portion 14 that protrudes upward, and the torsion beam 10 has an open cross-sectional shape that is open downward while defining an internal region I surrounded by the front longitudinal wall portion 11, the rear longitudinal wall portion 12, and the upper wall portion 13. Typically, the front vertical wall portion 11 hangs down from the upper wall portion 13 to be inclined slightly forward, and the rear vertical wall portion 12 hangs down from the upper wall portion 13 to be inclined slightly rearward. Further, typically, in the case where the torsion beam type suspension 1 receives a stationary load by the vehicle weight, the upper wall portion 13 can be considered to be substantially horizontal. The torsion beam 10 may have an open cross-sectional shape that opens obliquely forward and downward or obliquely rearward and downward, as necessary. The lower end of the front vertical wall 11 and the lower end of the rear vertical wall 12 are typically set to gradually decrease downward from the center in the width direction toward the left in relation to the desired torsional characteristics of the torsion beam 10.
Here, since the torsion beam type suspension 1 typically has a substantially bilaterally symmetrical shape with respect to a center plane that is perpendicular to the width direction and passes through the center in the width direction, the torsion beam 10 has a bilaterally symmetrical shape with respect to the center plane, and the seat portion 14 is also provided as a pair of bilaterally 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 supports 90 and 190 have shapes that are bilaterally symmetrical with each other with respect to the central plane, and are disposed at positions that are bilaterally symmetrical. 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 will be representatively explained by taking the left trailing arm 20, the left reinforcement 30, the left spring seat 80, and the left shock absorber bracket 90 as an example of the pair of left and right trailing arms 20 and 120, the pair of left and right reinforcements 30 and 130, the pair of left and right spring seats 80 and 180, and the pair of left and right shock absorber brackets 90 and 190.
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 has a collar member 100 formed by rolling a metal plate such as a steel plate, typically, for supporting the vehicle body welded to the front end portion thereof by arc welding or the like, and a wheel support member 110 formed of a metal such as steel, typically, for supporting the wheel, partially inserted to the rear end portion thereof by arc welding or the like. In addition, the left trailing arm 20 may be configured as required: two components are prepared by forming a flat plate member made of a metal plate such as a steel plate into a substantially U-shaped longitudinal section, and the two components are welded by arc welding or the like so as to face each other in the width direction or the vertical direction, and the left trailing arm 20 may be made of a single pipe member made of a metal such as a steel pipe. The wheel support 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 made of a metal plate such as a steel plate formed by press forming or the like, and is disposed to extend in the width direction between the torsion beam 10 and the left trailing arm 20, and the left end portion and the right end portion thereof are welded to correspond to the torsion beam 10 and the left trailing arm 20, respectively, to connect them.
Specifically, the left reinforcement 30 includes a bottom wall portion 31 as a main body of a molded product, a front flange 32 standing downward from a front end portion of the bottom wall portion 31, and a rear flange 33 standing downward from a rear end portion of the bottom wall portion 31, and the front flange 32 and the rear flange 33 extend in the width direction.
The left reinforcement 30 includes an outer attachment portion 40 as a left end portion outside the left end of the torsion beam 10. The outer attachment portion 40 typically has a cutout portion that is cut out so as to have a shape along the outer contour shape of the left trailing arm 20, and the cutout portion is welded thereto by arc welding or the like so as to be in contact with 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 inside the torsion beam 10. The inner attachment 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 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, which is shaped to follow 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 set with a welding 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 welding portion W. The seat portion 14 is a portion in which the upper wall portion 13 is provided so as to protrude in a protruding direction (upward direction) away from the inner region I of the torsion beam 10, and therefore, when the torsion beam 10 and the left trailing arm 20 are coupled by the left reinforcement 30, the rigidity of the upper wall portion 13 including the seat portion 14 can be increased, and the force to be applied to the welded portion W that is the coupling portion between the torsion beam 10 and the left reinforcement 30 can be dispersed, whereby the torsional characteristics of the torsion beam 10 can be set with a high degree of freedom so that the joint strength between the torsion beam 10 and the left trailing arm 20 and the bending rigidity of the torsion beam 10 are ensured and the stress concentration at the welded portion W between the torsion beam 10 and the left reinforcement 30 is suppressed. In order to further disperse the force to be applied to the welded portion W, 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.
In order to reliably suppress stress concentration at the welded portion W between the torsion beam 10 and the left reinforcement 30, the welded portion W is preferably disposed in a plug welding hole 34 formed in the right end portion of the bottom wall portion 31 of the inner attachment portion 50 so as to be perforated in correspondence with the seat portion 14. By providing the plug welding hole 34 in the bottom wall portion 31, it is possible to suppress concentration of stress at 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 that faces generally downward, and to suppress occurrence of stagnation of dust, moisture, and the like at 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-welding hole 34 and the lower wall surface portion of the seat portion 14 by arc welding or the like, and the entire plug-welding hole 34 may be filled with a welding material as necessary. Further, from the viewpoint of more reliably suppressing stress concentration at the welded portion W between the torsion beam 10 and the left reinforcement 30, the plug welding hole 34 is preferably an elongated hole as follows: a pair of arcs 34a, 34b facing each other in a predetermined direction X perpendicular to an upper direction, which is a projecting direction of the seat 14, are connected by a pair of connecting lines 34c, 34d facing each other, and the diameters of the pair of arcs 34a, 34b are different. The predetermined direction X is determined based on the following points: the stress balance between the welded portion W and the periphery of the plug weld hole 34 is obtained, and the force to be applied to the welded portion W, which is the joint portion between the torsion beam 10 and the left reinforcement 30, is dispersed. Typically, the centers C1, C2 of the pair of arcs 34a, 34b are arranged on a straight line L parallel to a direction X in which a stress generated in the torsion beam 10 propagates when the torsion beam is twisted (particularly, when both ends in the width direction of the torsion beam 10 are twisted in opposite phases), typically a direction intersecting the front-rear direction, the pair of connecting lines 34C, 34d are straight lines or curved lines protruding outward of the plug weld hole 34, and the plug weld hole 34 is formed in a shape that is line-symmetrical with respect to the straight line L such that the tip end of the water-drop shape is rounded. In order to balance the stress around the plug weld hole 34, the smaller diameter of the pair of arcs 34a and 34b is preferably arranged closer to either the front vertical wall 11 or the rear vertical wall 12 than the larger diameter of the pair of arcs 34a and 34 b.
Further, the seat portion 14 preferably has a recessed arrangement portion 15 recessed toward the inner region I in such a manner that a part thereof enters the plug weld hole 34. This allows the through hole 16 that functions as a drainage hole to be set in the recessed portion 15, and also increases the rigidity of the seat portion 14, thereby reliably suppressing stress concentration at the welded portion W between the torsion beam 10 and the left reinforcement 30. From the viewpoint of further improving the rigidity of the seat portion 14, the recessed portion 15 is preferably surrounded along the peripheral wall portion of the plug weld hole 34.
Further, it is preferable that the inner attachment portion 50 is provided with a flat wall portion 35 so as to face the upper wall portion 13 at a position offset from the right end portion of the bottom wall portion 31 toward the outer attachment portion 40 side, the flat wall portion 35 is a portion where the inner attachment portion 50 is recessed toward the upper wall portion 13, and the right end portion of the inner attachment portion 50 and the flat wall portion 35 are connected by an inclined wall portion 36. This can increase the rigidity of the inner attachment portion 50 and reliably suppress stress concentration at the welded portion W between the torsion beam 10 and the left reinforcement 30.
The flat wall portion 35 preferably has a front portion at the right end and a rear portion at the right end, each of which has a front extension 39F and a rear extension 39R extending to the right side of the intermediate portion 39C. This can surround the welded portion W at the right end of the inner attachment portion 50, thereby further improving the rigidity of the portion and dispersing the force to be applied to the welded portion W between the torsion beam 10 and the left reinforcement 30.
The left reinforcement 30 further includes an intermediate connecting portion 60 that connects the outer mounting portion 40 and the inner mounting portion 50. The intermediate connecting portion 60 is a diagonal portion that extends 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 as the intermediate connection portion 60, it is possible to suppress a rapid shape change in the longitudinal sectional shape of the torsion beam 10 in the width direction, and to alleviate stress concentration at a portion where the shape of the torsion beam 10 changes.
In addition, from the viewpoint of enhancing the strength and bending rigidity of the torsion beam 10 and enhancing the joining strength of the torsion beam 10 and the left trailing arm 20, the torsion beam 10 and the left reinforcement 30 may be configured to define a closed cross-sectional portion S in cooperation, the defined closed cross-sectional portion S being 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 be in contact with 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 corresponding torsion beam 10.
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, and is 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, and is 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 to correspond to the collar member 100 provided at the front end portion of the left trailing arm 20. The front end portion of the left trailing arm 20 is attached to the vehicle body by being fastened by a fastening member such as a typical bolt, not shown, by a bush member, not shown, press-fitted into the collar member 100 in the vehicle body attachment portion B1.
The wheel-side mounting portion W1 is disposed corresponding to the wheel support member 110 provided at the rear end portion of the left trailing arm 20. In the wheel-side mounting portion W1, a typical bearing member, not shown, is fastened to the wheel support member 110 by a fastening member, such as a bolt, not shown.
The spring attachment 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 by being placed on the upper surface portion of the bottom wall portion of the left spring receiver 80. In order to reduce the frictional 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. The damper mounting portion D1 is mounted by fastening the lower end portion of the damper, not shown, to the left and right side wall portions through holes provided in the respective side wall portions by fastening members, not shown, such as typical bolts.
The various wheel support 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 in that the member provided with the plug weld hole is changed, and the remaining structure is basically the same. 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 this difference.
Specifically, in the torsion beam type suspension 1' in the present modification, the seat portion 14 provided in the upper wall portion 13 of the torsion beam 10 is perforated to provide the plug welding hole 17, and the welded portion W where the right end portion of the bottom wall portion 31 of the inner mounting portion 50 of the left reinforcement 30 is abutted against the seat portion 14 and welded is disposed in the plug welding hole 17. By providing the plug welding hole 17 in the seat portion 14, the welding portion W can be set at a portion generally surrounded by the peripheral member on the upper side of the vehicle, and occurrence of contact between foreign matter such as debris and the like and the welding portion can be suppressed when the vehicle is traveling. The plug welding hole 17 has a structure having the same shape and the like as the plug welding hole 34 provided in the bottom wall portion 31 of the inner attachment portion 50.
Further, the inner mounting portion 50 preferably has a recessed setting portion 37 recessed toward the inner region I in such a manner that a part thereof is away from the plug-weld hole 17. This allows the through hole 38 that functions as a drain hole to be set in the recessed portion 37, and also 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 recessed portion 37 has a structure having the same shape as the recessed portion 15 provided in the seat 14.
According to the torsion beam type suspensions 1, 1' of the present embodiment including the above-described modifications, the welding 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. The seat portion 14 is a portion where the upper wall portion 13 is provided to protrude in a protruding direction (upward direction) away from the inner region I of the torsion beam 10, and therefore, when the torsion beam 10 and the left trailing arm 20 are coupled by the left reinforcement 30, the rigidity of the upper wall portion 13 including the seat portion 14 can be increased, and the force to be applied to the welded portion W that is the coupling portion between the torsion beam 10 and the left reinforcement 30 can be dispersed, whereby the torsional characteristics of the torsion beam 10 can be set with a high degree of freedom so that the joint strength between the torsion beam 10 and the left trailing arm 20 and the bending rigidity of the torsion beam 10 are ensured, and the stress concentration at the welded portion W between the torsion beam 10 and the left reinforcement 30 is suppressed.
Further, according to the torsion beam type suspensions 1 and 1' of the present embodiment including the modified example, the welded portion W is disposed in the plug welding hole 34 provided by punching a 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 disposed in the plug welding hole 17 by punching a 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 portion 31, the force to be applied to the welded portion W can be reliably dispersed, and the welded portion W can be set on the generally downward left reinforcement 30 side, and the occurrence of dust, moisture, and the like remaining in the welded portion W can be suppressed. Further, when the plug welding hole 17 is provided in the seat portion 14, in addition to reliably dispersing the force to be applied to the welded portion W, the welded portion W can be set at a portion generally surrounded by the peripheral member on the upper side of the vehicle, and occurrence of contact between foreign matter such as debris and the welded portion when the vehicle is traveling can be suppressed.
In the present invention, the type, shape, arrangement, number, and the like of the components are not limited to those in the above embodiments, and it is needless to say that the components may be appropriately replaced with components having equivalent effects, and the like, and the components may be appropriately modified within a range not departing from the gist of the present invention.
As described above, in the present invention, the following torsion beam type suspension can be provided: in the case where the torsion beam and the trailing arm are coupled by the reinforcing member, the torsion characteristics of the torsion beam can be set with a high degree of freedom so that the joint strength between the torsion beam and the trailing arm and the bending rigidity of the torsion beam are ensured and the stress concentration at the coupling portion between the torsion beam and the reinforcing member is suppressed.
Claims (8)
1. A torsion beam suspension, comprising:
a left trailing arm that extends in a longitudinal direction of a vehicle body on a left side in a width direction of the vehicle body, is supported by the vehicle body on a front side in the longitudinal direction, and supports a wheel on a rear side in the longitudinal direction;
a right trailing arm that extends in the longitudinal direction on the right side in the width direction, is supported by the vehicle body on the front side in the longitudinal direction, and supports a wheel on the rear side in the longitudinal direction;
a torsion beam that extends in the width direction, has an open cross-sectional shape having a pair of wall portions that face each other and a connecting wall portion that connects between the pair of wall portions, in a longitudinal cross section taken along a plane perpendicular to the width direction, and connects the left trailing arm and the right trailing arm;
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; the middle left connecting part is used for connecting the inner left mounting part and the outer left mounting part, and the left reinforcing piece is used for 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 reinforcement connecting the torsion beam and the right trailing arm,
wherein,
the torsion beam has, in the connecting wall portion: a left seat portion configured with a left welding portion at which the inner left mounting portion is welded to the connecting wall portion; and a right seat portion provided with a right welding portion at which the inner right mounting portion is welded to the connecting wall portion,
the left seat portion is a portion where the connecting wall portion is provided so as to protrude in a protruding direction away from the inner region,
the right seat portion is a portion where the connecting wall portion protrudes in the protruding direction.
2. The torsion beam suspension of claim 1,
the left welding portion is disposed at a left plug welding hole provided at one of the connecting wall portion and the inner left mounting portion,
the left plug-weld hole is a long hole having different diameters of a pair of circular arcs opposed to each other in a direction perpendicular to the projecting direction,
the right welding portion is disposed at a right plug welding hole provided at one of the connecting wall portion and the inner right mounting portion,
the right plug welding hole is a long hole having different diameters of a pair of circular arcs facing each other in a direction perpendicular to the projecting direction.
3. The torsion beam suspension of claim 2,
the left plug welding hole is arranged on the inner left mounting part,
the right plug welding hole is formed in the inner right mounting portion.
4. The torsion beam suspension of claim 3,
the left seat portion has a portion recessed toward the inner region in such a manner that a portion thereof enters the left plug weld hole,
the right seat portion has a portion recessed toward the inner region in such a manner that a portion thereof enters the right plug-welding hole.
5. The torsion beam suspension of claim 2,
the left plug welding hole is arranged on the left seat part,
the right plug welding hole is arranged on the right seat part.
6. The torsion beam suspension of claim 3,
the inner left mounting portion has a portion recessed toward the interior region with a portion thereof distal from the left plug weld hole,
the inner right mounting portion has a portion that is recessed toward the inner region with a portion thereof away from the right plug weld hole.
7. The torsion beam suspension of claim 1,
a left flat wall portion that is a portion of the inner left attachment portion that is recessed toward the connection wall portion and is connected to the left flat wall portion by a left inclined wall portion is provided on the inner left attachment portion so as to be offset from a right end portion of the inner left attachment portion toward the outer left attachment portion and to be opposed to the connection wall portion with a clearance therebetween,
the inner right attachment portion is provided with a right flat wall portion that is a portion of the inner right attachment portion recessed toward the connecting wall portion, the right flat wall portion being offset from a left end portion of the inner right attachment portion toward the outer right attachment portion and facing the connecting wall portion in a manner to be separated from the connecting wall portion, and the left end portion of the inner right attachment portion and the right flat wall portion are connected by a right inclined wall portion.
8. The torsion beam suspension of claim 7,
a portion on the front side of a right end portion of the left flat wall portion and a portion on the rear side of the right end portion have right protruding portions protruding toward the right side respectively,
a portion of a left end portion of the right flat wall portion on the front side and a portion of the left end portion on the rear side have left protruding portions protruding toward the left side, respectively.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019068055A JP7170577B2 (en) | 2019-03-29 | 2019-03-29 | torsion beam suspension |
| JP2019-068055 | 2019-03-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111746216A true CN111746216A (en) | 2020-10-09 |
| CN111746216B 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) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110072714A (en) * | 2017-01-17 | 2019-07-30 | 日野自动车株式会社 | Supporting beam |
| WO2024133514A1 (en) * | 2022-12-22 | 2024-06-27 | Renault S.A.S. | Axle with crossmember having an open profile and gusset |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20230172296A (en) * | 2022-06-15 | 2023-12-22 | 현대자동차주식회사 | Reinforcing structure of the suspension |
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- 2019-03-29 JP JP2019068055A patent/JP7170577B2/en active Active
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- 2020-03-27 BR BR102020006193-3A patent/BR102020006193A2/en unknown
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2020164092A (en) | 2020-10-08 |
| CN111746216B (en) | 2023-05-30 |
| BR102020006193A2 (en) | 2020-12-01 |
| JP7170577B2 (en) | 2022-11-14 |
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