JP2001260936A - Suspension frame structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suspension frame structure capable of improving the rigidity at a brake, at a lateral load, or at an engine mount load. SOLUTION: An upper plate and a lower plate are connected to form a suspension frame, and support parts of a suspension arm 5 are longitudinally provided at both the right and left end parts of the suspension frame in this suspension frame structure. The lower plate 9 comprises a pair of side plates 111, 112 provided with support parts supporting at least rear side arm parts of the suspension arm 5 and a center plate 12 connecting the side plates 111, 112 together.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a suspension frame structure for supporting a suspension lower arm, an engine mount member and the like.

[0002]

2. Description of the Related Art In general, the body structure of an automobile is roughly classified into a structure with a frame used for trucks and the like and a frameless structure used for passenger cars and the like. Instead of having a frame, the frameless structure incorporates side members and cross members as part of the body to improve torsional rigidity. Chassis components are attached directly to the body, but some vehicles are attached to a partial frame, or so-called subframe, before being assembled to the body.

[0003] This sub-frame is usually called a suspension frame because a suspension lower arm is attached to both sides. Hereinafter, the subframes and the like are collectively referred to as a suspension frame. This suspension frame is a suspension lower arm,
A stabilizer and the like are attached to the vehicle body as an assembly part. This suspension frame generally has an upper plate, a lower plate, and a lower arm mounting bracket as a basic structure.

FIGS. 14 to 16 show the structure of a conventional suspension frame (JP-A-7-179180). The suspension frame 100
Both sides are supported by a pair of side members 101, 101, and suspension lower arms 102, 102 are attached to both sides of the suspension frame 100. A center member 104 is bridged between the suspension frame 100 and a cross member 103 provided at the front, and an engine 105 is assembled. The suspension frame 100 is normally disposed below an engine room partitioned by a dash panel 106, and is equipped with various equipment and the like. A steering knuckle 107 is attached to the dash panel 106 by a bracket 108.

[0007] As shown in FIGS. 17 to 19, the suspension frame 100 is usually formed by welding an upper plate 109 and a lower plate 110 formed by pressing a steel plate or the like by press forming. Vehicle attachment parts h, i, j attached to the vehicle body on both left and right sides
Is provided, and an engine mount member mounting portion k is provided at a central portion. This suspension frame 10
A pair of suspension lower arm mounting portions 100a and 100b are provided on both sides in the vehicle width direction 0. A lower arm mounting bracket 111 is provided in a cantilevered state on the suspension lower arm mounting portion 100a on the front side of the vehicle body. The lower arm mounting bracket 111 is formed by opening one side surface of a substantially square box by press molding or the like, and is provided on the opposing wall surfaces 111a, 111b with the shaft support portions 11 of the suspension lower arms 102, 102.
2,112 are provided. The lower arm mounting bracket 111 is cantilevered on the outside of the vehicle body mounting portions h, i, and j of the suspension frame 100, and therefore has a low rigidity and is disadvantageous to steering stability and vibration noise.

As shown in FIG. 19, a mounting portion of the lower arm mounting bracket 111 is joined to a top portion 109a of an upper plate 109 by partially overlapping the upper surface of the lower arm mounting bracket 111. Also, the lower plate 11
0 is welded against the wall surface of the lower arm mounting bracket 111, so that the reinforcement 11
3 is reinforced between the upper plate 109 and the lower plate 110. Further, along the opening end of the lower arm mounting bracket 111, the flange 114
Is provided to improve rigidity.

[0007] The most severe condition of the suspension frame 100 is when a load in the front-rear direction is applied (for an actual vehicle, for example, when braking or falling into a pothole). As shown in FIG. 20, the deformation mode of the suspension frame 100 at the time of a braking load is a mode in which the mounting portion 100a of the lower arm mounting bracket 111 is opened while being twisted outward as indicated by an arrow.
Is in a mode of sinking downward as indicated by a broken line. Suspension frame 100 Central part 100
The sinking of b also occurs when a load is applied from the engine mount member at the time of sudden start.

On the other hand, as shown in FIG. 21, when a load is applied from the lateral direction, the lower arm mounting bracket 11
The first mounting portion 100a is twisted inward as indicated by an arrow. As a result, the lower arm mounting portion 100d on the rear side of the vehicle body of the suspension frame 100 deforms one upward as shown by the arrow and the other downward as shown by the arrow. One is deformed upward as indicated by an arrow and the other is deformed downward as indicated by an arrow, resulting in a wavy mode.

[0009]

As is apparent from the above deformation modes, the suspension frame 100
However, if only the upper and lower two sheets are aligned, the rigidity around the opening for mounting the lower arm is low. In the vicinity of the opening, there is a vehicle body mounting part,
If the rigidity of the suspension frame 100 in this portion is low, the primary natural frequency of the suspension frame 100 may resonate with the vehicle body.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a suspension frame structure capable of improving rigidity during braking, lateral load or engine mount load.

[0011]

According to the present invention, a suspension frame is formed by joining an upper plate and a lower plate, and a suspension arm support portion is provided on both left and right ends of the suspension frame. In the suspension frame structure provided at the front and rear, the lower plate is configured by a pair of side plates provided with a support portion that supports at least a rear arm portion of the suspension arm, and a center plate that connects these side plates to each other. is there. Also,
The present invention resides in that the plate thickness of the side plate is made larger than the plate thickness of the center plate, and an attachment portion to the vehicle body is provided on the side plate side. Further, the present invention resides in that support portions for suspension arms are provided before and after the left and right side plates, and side walls are formed on outer portions of these side plates. Further, a bent portion is formed at both ends of the center plate to form a gap between the left and right side plates, and a lower end of the bent portion is joined to the left and right side plates to form a suspension frame. In that a vertical wall partitioning the interior of the interior is formed. Further, the upright wall portion is configured to be arranged on substantially the same straight line as the side wall portion. Further, the side wall portion provided on the side plate is formed close to the vehicle body mounting portion of the suspension frame. Furthermore, both ends of the center plate were formed so as to partially overlap the left and right side plates, and the overlapped portion was inclined toward the upright wall portion, and a gap was formed in the overlapped portion. It is in. In addition, the inclined portion of the center plate extends at least to a vehicle body attachment portion of the suspension frame.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a front portion of a vehicle body of an automobile. An engine room 2 partitioned by a dash panel 1 has front side members 31 disposed on both sides of the vehicle body.
, 32 via a bracket 4, a suspension frame 5 is disposed on the lower side of the engine room. Outside the front side members 31, 32, the left and right wheels 6
Are provided respectively.

The structure of the suspension frame 5 is shown in FIG.
A description will be given with reference to FIG. As shown in FIGS. 2 to 6, the suspension frame 5 has an upper plate 8 and a lower plate 9 formed by press molding, respectively, and the upper plate 8 and the lower plate 9 are formed.
Are joined together by welding or the like to form a substantially closed curved surface structure.

As shown in FIGS. 2 to 4, the upper plate 8 is formed by bending a front end and a rear end of a flat steel plate downward to stand down, and has suspension lower arms 101, The arm of 102
Suspension lower arm supporting portions 8a and 8b for supporting a and 10b are provided to be branched and extended substantially forward and sideways, respectively. The upper lower plate 8 is provided with a suspension lower arm supporting portion 8a from the front side of the vehicle body.
Falling part 8 hanging downwards toward the inner surface of
c, and a flange portion 8d is provided along the lower edge of the falling portion 8c. Further, a flange portion 8e is provided along a lower end portion of the rear surface of the vehicle body from a peripheral portion of the suspension lower arm support portion 8b.

On the other hand, as shown in FIGS. 4 and 5, the lower plate 9 has a pair of side plates 111, 1.
12 and a center plate 12 disposed between the side plates 111 and 112 to form a three-part structure.
112 and the center plate 12 are joined together to be integrally formed. The side plates 111 and 112 and the center plate 12 are formed by press-forming a steel plate. The plate thickness of the side plates 111 and 112 is formed larger than the center plate 12. As the center plate 12, a band-shaped plate having a smaller thickness than the conventional one is used. The pair of side plates 111 1, 112 are formed such that suspension lower arm supporting portions 11 a, 11 b supporting the arms 10 a, 10 b of the suspension lower arms 101, 102 diverge almost right and left on the left and right sides similarly to the upper plate 8. It is provided out. The pair of side plates 1
Left and right lower arm mounting brackets 1 are provided on suspension lower arm support portions 11a provided on
Arms 10a and 10b of suspension lower arms 101 and 102 are swingably supported by the lower arm mounting brackets 141 and 142. Suspension lower arms 101, 1 are provided on the suspension lower arm support portion 11a.
02 is provided with a notch 11c for allowing the arms 10a and 10b to swing. A flange 11d is provided at a front edge of the pair of side plates 111 and 112 on the vehicle body front side, and a flange 11e is provided at a rear end of the vehicle body rear side from the suspension lower arm support 11b. I have.

This suspension lower arm support portion 11
suspension lower arm support 11b on the side from a
The side wall 11f is provided on the outer surface of the suspension frame 5 extending to the base end of the side plate 111,1.
12 stands outside. This side wall 11f
Is formed by bending the outer edges of the side plates 111 and 112 upward at substantially right angles.

The center plate 12, as shown in FIGS.
The inclined wall 12b is bent obliquely upward with respect to b to form a slope 12c, and both ends of the slope 12c are bent downward at substantially right angles to form a vertical wall 12d.
The upright wall portion 12d is provided with a flange portion 12e at a peripheral portion, and is connected to the side plates 111 and 112 via the flange portion 12e. The center plate 12 is formed such that the upright wall portions 12d on both sides are substantially continuous with the side wall portions 11f of the side plates 111, 112.
Has been assembled. The center plate 12 welds the lower end of the standing wall portion 12d to the upper surfaces of the side plates 111 and 112 by arc welding w1, and the middle portion 12b.
Are welded by arc welding to the upper surfaces of the side plates 111 and 112, and are integrally formed. A gap 13 is formed between the inclined surface 12c of the center plate 12 and the upper surfaces of the side plates 111 and 112 to form a closed cross section S.

At the left and right ends of the suspension frame 5, an upper plate 8 and a lower plate 9 are joined to form suspension lower arm supports 5a, 5a.
b is formed. The suspension lower arm support 5a is provided with left and right lower arm mounting brackets 141 and 142 supported by the suspension lower arm support 8a of the upper plate 8 and the suspension lower arm support 11a of the side plates 111 and 112 constituting the lower plate 9. It is formed. The lower arm mounting brackets 141 and 142 are formed in a substantially box shape by press molding or the like, and one side surface of the box shape is opened to form a supporting portion for the swing shaft of the suspension lower arm 10. A mounting hole 14b for mounting the swing shaft of the suspension lower arm 10 is provided on a front-rear wall surface 14a of the box-shaped vehicle body facing the front-rear direction. Suspension lower arm support 5b
Are formed by a suspension lower arm support 8b of the upper plate 8 and a suspension lower arm support 11b of the lower plate 9.

On the other hand, as shown in FIG. 4, an engine mount member mounting portion 15 is provided at a substantially central portion of the suspension frame 5. Also, the side plates 111 of the upper plate 8 and the lower plate 9,
112 are provided with vehicle body mounting holes 8h, 8i, 8j and 11h, 11i, 11j of the suspension frame 5, respectively. The center plate 12 includes:
Mounting holes 12i corresponding to the vehicle body mounting portions 8i, 11i are provided. As shown in FIG. 9, collars 16 are fitted and welded to the vehicle body mounting holes 8h, 8i, 8j and 11h, 11i, 11j, respectively. At the portion where the center plate 12 is provided, a mounting hole 12i is provided.
Are also connected by a common collar 16. In the center plate 12 mounting portion, the upper plate 8 and the center plate 12 are joined to each other by penetration welding w3 as shown in FIGS. The center plate 12 and the side plates 111 and 112 and the center plate 12 and the upper plate 8 can be joined by various joining methods such as arc welding and spot welding.

Further, the suspension lower arm support 8b of the upper plate 8 and the suspension lower arm support 11b of the lower plate 9 are mounted for supporting the rear arms 10b of the suspension lower arms 101 and 102 as shown in FIG. Holes 8g and 11g are provided (see FIG. 4). The suspension lower arms 101 and 102 are, as shown in FIG.
The front arm 10a is supported by a horizontal axis, and the rear arm 10b is supported by a vertical axis. A bush 17 is provided on the front arm 10a and the rear arm 10b.
01 and 102 are swingably supported by the suspension frame 5 with a support shaft inserted through the center of the bush 17.

As shown in FIG. 4, the suspension lower arm supporting portion 5b of the suspension frame 5
The ribs 8k, 11k in the vehicle width direction are formed on the suspension lower arm support portion 8b of the upper plate 8 and the suspension lower arm support portion 11b of the lower plate 9 to improve rigidity. Further, the suspension lower arm supporting portion 8b of the upper plate 8 is formed to be one step higher to widen the gap with the suspension lower arm supporting portion 9b of the lower plate 9, and forms the supporting portion of the arm 10b of the suspension lower arms 101 and 102. I have.

Next, according to the above configuration, the lower plate 9
Is composed of a pair of side plates 111 and 112 and a center plate 12 disposed between the side plates 111 and 112 so as to be divided into three parts, and the pair of side plates 111 and 112 and the center plate 12 are joined. And integrally molded. Center plate 12
Thus, the thickness of the suspension frame 5 can be reduced by making the plate thickness thinner and the mass lower than before. on the other hand,
The plate thickness of the side plates 111 and 112 is formed larger than the plate thickness of the center plate 12 to improve the rigidity of the vehicle body mounting portion. By increasing the plate thickness of the side plates 111 and 112, the natural frequency of the suspension frame 5 is improved, and so-called booming noise is suppressed. The center plate 12 has a lower end of the standing wall portion 12d welded to the upper surfaces of the side plates 111 and 112 by arc welding w1 and both end edges of the intermediate portion 12b are welded to the upper surfaces of the side plates 111 and 112 by arc welding w2.
And is integrally molded, so that the center plate 12
A gap 13 is formed between the slope 12c and the upper surfaces of the side plates 111 and 112 to form a closed cross section S, so that the closed curved surface of the suspension frame 5 can be reinforced by the upright wall 12d. Therefore, it is possible to improve the braking force, the lateral force, and the rigidity under the load of the engine mount. In addition, the mounting portions to the vehicle body include two side plates 111 and 112 and a center plate 12.
Since the mounting portions are formed on the side plates 111 and 112 having rigidity, the surface rigidity can be improved, and the rigidity of the vehicle body mounting portion can be improved.

The suspension lower arm supporting portion 5b of the suspension frame 5 is provided with an upper plate 8
The ribs 8k and 11k in the vehicle width direction are formed on the suspension lower arm support portion 8b of the above and the suspension lower arm support portion 11b of the lower plate 9 to improve rigidity. Further, the suspension lower arm supporting portion 8b of the upper plate 8 is formed one step higher to widen the gap with the suspension lower arm supporting portion 11b of the lower plate 9 to form the supporting portion of the arm 10b of the suspension lower arms 101 and 102. . by this,
Arm 1 of suspension lower arms 101 and 102
0b Only the upper plate 8 and the lower plate 9
, The rigidity of the suspension frame 5 does not decrease. Since the arms 10b of the suspension lower arms 101 and 102 are supported between the upper plate 8 and the lower plate 9, the rigidity can be improved. In particular, the suspension lower arm support portion 8b and the suspension lower arm support portion 11b are joined to each other on the distal end side and the rear end side, and the base end side is formed on the upright wall 12 of the center plate 12.
Since the connection is made by d, only the draw-out portion of the arm 10b of the suspension lower arms 101 and 102 is open, so that the support portion of the arm 10b can have a strong structure.

FIGS. 11 to 13 show another embodiment of the present invention, and the same parts as those in FIGS. 1 to 4 are denoted by the same reference numerals. In this case, the structure of the lower plate 9 'of the upper plate 8 and the lower plate 9' constituting the suspension frame 5 is changed. The lower plate 9 'is provided with the suspension lower arms 101, 1
In this example, only the left and right suspension lower arm supporting portions for supporting the rear arm 10b of the second embodiment are divided from the intermediate portion. The lower plate 9 'is a side plate 18 comprising a suspension lower arm support 18b.
1, 182 and these side plates 181, 18
2 and a center plate 19 connected to each other. The center plate 19 is provided with suspension lower arm support portions 19a at both front end portions.

The center plate 19 is provided with side wall portions 19f in the longitudinal direction of the vehicle body on both side portions. The side wall 19f is provided with a suspension lower arm support 19a.
Is provided from the vicinity to the rear end, and partitions the internal space of the suspension frame 5 between the center plate 19 side and the suspension lower arm support portion 18b side. The side plates 181 and 182 are joined to an outer lower end of the side wall portion 19f of the center plate 19 by, for example, arc welding. This lower plate 9 '
The upper end of the side wall 19f is joined to the flanges 19d and 19e provided on the front and rear of the center plate 19, and the upper end of the side plate 19f. The side plates 181 and 182 are The outer peripheral surface of the suspension lower arm support portion 8b is joined to the upper plate 8 by spot welding or the like and integrally joined to the upper plate 8.

In this case, as mounting portions to the vehicle body, vehicle body mounting holes 8h, 8i, 8j are formed in the upper plate 8, and vehicle body mounting holes 19h, 19i, 1 are formed in the lower plate 9 '.
8j are provided respectively. Body mounting holes 19h, 1
9i is formed in the center plate 19,
8j is provided on the side plates 181 and 182.

Also in this embodiment, the side plates 181 and
By making the thickness of 182 thicker than that of the center plate 19, the rigidity of the suspension lower arm support portion 18b can be improved.

It should be noted that the present invention is limited only to the above-described embodiment.
The present invention is not limited to this. For example, in the present invention, a pair of side plates 111 and 112 and a center plate 12 are divided into three, but it is also possible to divide into three or more. In another embodiment, the side plate 181 and the side plate 181 including the suspension lower arm support portion 18b are provided.
182 and the center plate 19 are divided into three parts, but the suspension lower arm support part 19a may be divided into five parts by a divided structure. Further, in the above-described embodiment, the mounting portion to the vehicle body is composed of the thick side plates 111 and 112 in which the mounting portions to the vehicle body are collected, the center plate 12 having the small thickness, or the mounting portion to the vehicle body. Although it is divided into the side plates 181 and 182 provided only with the portion and the center plate 19, any division form is possible. Needless to say, the present invention can be carried out by appropriately changing the gist of the present invention without departing from the scope of the present invention.

[0030]

As described above, according to the suspension frame structure of the present invention, the following effects can be obtained. The suspension frame structure according to claim 1, wherein a suspension frame is formed by joining the upper plate and the lower plate, and a suspension arm support portion is provided at both left and right ends of the suspension frame. The suspension arm consists of a pair of side plates with a support that supports at least the rear arm of the suspension arm, and a center plate that connects these side plates to each other, thus improving braking force, lateral force, and rigidity when the engine is loaded. Can be achieved. The mass damper can be eliminated by improving the rigidity at the time of mounting load. In claim 2, the thickness of the side plate is made larger than the thickness of the center plate, and the side plate is provided with a mounting portion to the vehicle body. In addition, it is possible to improve the rigidity under the load of the engine mount. According to the third aspect, the suspension arm support portions are provided before and after the left and right side plates, and the side wall portions are formed on the outer portions of these side plates. Can be planned. 5. The suspension according to claim 4, wherein a bent portion is formed at both ends of the center plate to form a gap between the left and right side plates, and a lower end of the bent portion is joined to the left and right side plates. Since the upright wall portion that partitions the inside of the frame is formed, it is possible to improve the braking force, the lateral force, and the rigidity of the suspension frame under the load of the engine mount. According to the fifth aspect, the upright wall portion is arranged on substantially the same straight line as the side wall portion, so that it is possible to improve the braking force, the lateral force, and the rigidity of the suspension frame at the time of load on the engine mount. In the sixth aspect, since the side wall portion provided on the side plate is formed close to the vehicle body mounting portion of the suspension frame, the rigidity of the vehicle body mounting portion can be improved. 8. The center plate according to claim 7, wherein both end portions of the center plate are formed so as to partially overlap the left and right side plates. Therefore, it is possible to improve the rigidity of the suspension frame when the braking force, the lateral force, and the load on the engine mount are increased. In claim 8, since the inclined portion of the center plate is extended at least to the vehicle body mounting portion of the suspension frame, the rigidity of the vehicle body mounting portion can be improved.

[Brief description of the drawings]

FIG. 1 is a conceptual perspective view showing an embodiment of a suspension frame structure according to the present invention.

FIG. 2 is a perspective view showing the suspension frame structure of FIG.

FIG. 3 is a plan view showing the suspension frame structure of FIG. 2;

FIG. 4 is an exploded perspective view showing the suspension frame structure of FIG. 2;

FIG. 5 is a perspective view showing a lower plate of FIG. 2;

FIG. 6 is a perspective view showing an assembly portion of a center plate and a side plate of FIG. 5;

FIG. 7 is a plan view of a suspension frame showing a joint portion of a center plate.

FIG. 8 is a bottom view of FIG. 7;

FIG. 9 is a sectional view taken along line AA of FIG. 7;

FIG. 10 is a perspective view showing the suspension lower arm of FIG. 1;

FIG. 11 is a conceptual perspective view showing another embodiment of the suspension frame structure according to the present invention.

FIG. 12 is a perspective view showing the lower plate in a state where the center plate and the side plate of FIG. 11 are combined.

FIG. 13 is a sectional view showing a state where the suspension frame of FIG. 11 is assembled.

FIG. 14 is a perspective view showing a conventional suspension frame structure.

FIG. 15 is a plan view showing a conventional suspension frame structure.

FIG. 16 is a side view of FIG. 9;

FIG. 17 is a plan view showing a conventional suspension frame structure.

FIG. 18 is a perspective view showing a conventional suspension frame structure.

19 is a sectional view taken along line BB of FIG.

FIG. 20 is a perspective view showing a deformation mode at the time of a braking load by the conventional suspension frame structure.

FIG. 21 is a perspective view showing a deformation mode when a lateral load is applied by a conventional suspension frame structure.

[Description of Signs] 1 Dash panel 2 Engine room 31, 32 Side member 4 Bracket 5 Suspension frame 6 Wheel 7 Strut 8 Upper plate 9 Lower plate 101, 102 Suspension lower arm 111, 112 Side plate 12 Center plate 13 Gap 141, 142 Lower arm Mounting bracket 5a, 5b Suspension lower arm support 8h, 8i, 8j, 11h, 11i, 11j Body mounting holes 11a, 11b Suspension lower arm support 11f Side wall 12d Standing wall

Claims (8)

[Claims] In a suspension frame structure in which an upper plate and a lower plate are joined to form a suspension frame, and support portions for suspension arms are provided on both left and right ends of the suspension frame, the lower plate is provided with: A suspension frame structure comprising a pair of side plates provided with a support portion for supporting at least a rear arm portion of a suspension arm, and a center plate connecting the side plates to each other. 2. The suspension frame structure according to claim 1, wherein the side plate has a thickness greater than that of a center plate, and a mounting portion for attaching to a vehicle body is provided on the side plate side. . 3. The suspension frame structure according to claim 1, wherein a suspension arm support portion is provided before and after the left and right side plates, and a side wall portion is formed outside the side plates. . 4. A bent portion that forms a gap between the left and right side plates at both ends of the center plate, and the lower end of the bent portion is joined to the left and right side plates. The suspension frame structure according to any one of claims 1 to 3, wherein an upright wall portion that partitions an inside of the suspension frame is formed. 5. The suspension frame structure according to claim 4, wherein said upright wall portion is arranged on substantially the same straight line as said side wall portion. 6. A side wall provided on the side plate,
The suspension frame structure according to any one of claims 3 to 5, wherein the suspension frame is formed close to a vehicle body mounting portion of the suspension frame. 7. Both ends of the center plate are formed so as to partially overlap the left and right side plates,
The suspension frame structure according to any one of claims 4 to 5, wherein the overlapping portion is inclined toward the upright wall portion, and a gap is formed in the overlapping portion. 8. The suspension frame structure according to claim 7, wherein the inclined portion of the center plate extends at least to a vehicle body mounting portion of the suspension frame.