JP6199587B2 - Vehicle suspension - Google Patents

Description

The present invention relates to a vehicle suspension including a pair of left and right suspension arms and a cross member that is installed on the left and right arms and mainly serves as a stabilizer when the vehicle turns.

Conventionally, there is a suspension of the vehicle described in Patent Document 1 below. According to this publication, the suspension of the vehicle extends in the front-rear direction of the vehicle body, and each front end portion is supported on the vehicle body by the pivotal support so that each rear end portion can support the wheel and swing up and down. It has a pair of left and right suspension arms that are pivotally supported, and a cross member that spans the left and right arms and connects the two arms.

When the cross member elastically twists and deforms when the vehicle turns, and the torsional stress (shearing stress) is generated in the cross member, the cross member mainly functions as a stabilizer to stabilize the vehicle. This makes it possible to improve the vehicle maneuverability.

JP 2006-182141 A

By the way, when the vehicle turns, a large bending moment may be given to each arm due to an external force from the wheel side toward the width direction of the vehicle body. In this case, the rigidity of the arms tends to be insufficient, and the arms are deformed, which may impair the handling performance.

Therefore, it is possible to increase the cross-sectional area of each arm or cross member or apply a material with high rigidity so that the bending moment applied to each arm can be strongly countered when the vehicle turns. It is done. However, this is not preferable because the suspension is enlarged and the mass is increased, and the production cost may be increased.

The present invention has been made paying attention to the circumstances as described above, and the object of the present invention is to allow each arm of the suspension to strongly counter the external force from the wheel side when the vehicle turns, and Even in this case, the suspension can be made small and light, and the production cost can be reduced.

In the invention of claim 1, as illustrated in all the drawings, each front end portion extends in the front-rear direction of the vehicle body 2, and each rear end portion thereof supports the wheels 4, 5 and can swing up and down. A pair of left and right suspension arms 10 and 11 pivotally supported on the vehicle body 2 by the pivot support 13 and the left and right arms 10
, 11 and a vehicle suspension including a cross member 14 that couples the arms 10 and 11 to each other.
In the plan view of the vehicle body (FIGS. 1, 4, and 6), the cross member 14 is formed in an X shape, and the front and rear end portions on the left and right sides of the cross member 14 correspond to the above. The vehicle suspension is characterized by being coupled to the front and rear end sides of the arms 10 and 11.

In the invention of claim 2, as shown in FIGS. 1 to 3, the cross member 14 is constructed on the front end side of the left and right arms 10, 11, and the middle part in the longitudinal direction is behind the vehicle body 2. A front member 35 that is bent so as to be convex toward the rear, and a rear part of each of the left and right arms 10 and 11 that is bent so that a midway portion in the longitudinal direction thereof is convex toward the front of the vehicle body 2. Member 3
6. The vehicle suspension according to claim 1, further comprising a connecting member 37 that rotatably connects the top portions of the front and rear members 35 and 36 that are bent.

The invention of claim 3 is an imaginary line connecting the end portions of the front and rear members 35 and 36, respectively, as seen from the line of sight in the front-rear direction of the vehicle body 2 as shown in FIGS. Space 4 surrounded by
The vehicle suspension according to claim 2, wherein the connecting body 37 is positioned above 6.

The invention of claim 4, as illustrated in FIGS. 1 to 3, of the front and rear members 35, 36,
4. The vehicle suspension according to claim 2, wherein any one of the members is made of a rigid long material that is a bar material or a pipe material.

As shown in FIGS. 4 to 6, the invention of claim 5 is a U-shape in which the connecting body 37 is a ball joint type universal joint, and each cross section in the longitudinal direction of the front member 35 is opened forward. or a U-shaped, each side portion of the cross section of the front member 35 (FIG. 6) each torsion center line 49 by torsional moment T1 of about, respectively center 48 and the coupled body of the pivotal支具13 The vehicle suspension according to any one of claims 2 to 4, wherein each of the 37 balls 43 passes through the vicinity of the ball center 43a.

In the invention of claim 6, as shown in FIGS. 4 to 6, the coupling body 37 is a ball joint type universal joint, and the rear member 36 is arranged in parallel in the front and rear, respectively.
, 11 before and after the rear end of each of the rear members 52 and 53, and the cross-sections of the front and rear beams 52 and 53 at the midway in the longitudinal direction of the rear member 36. The front and rear beams 5 are formed in a U-shape that is open toward the front, and in the central portion of the rear member 36 in the longitudinal direction.
2 and 53, the bottom plates 52a and 53a are overlapped and joined together, and the bottom plates 52a and 53 are connected to each other.
The vehicle suspension according to any one of claims 2 to 4, wherein the coupling surface 55 of a is positioned in the vicinity of the ball center 43a of the ball 43 of the coupling body 37.

In the invention of claim 7, as illustrated in FIGS. 4 to 6, the connecting body 37 is a ball joint type universal joint, and a U-shaped configuration in which each longitudinal section of the front member 35 is opened forward. or a U-shaped, each side portion of the cross section of the front member 35 (FIG. 6) each torsion center line 49 by torsional moment T1 of about, respectively center 48 and the coupled body of the pivotal支具13 So that it passes through the vicinity of the ball center 43a of the 37 balls 43,
The rear member 36 includes rear beams 52 and 53, which are arranged side by side in front and rear and are respectively installed on the rear end portions of the left and right arms 10 and 11, respectively. The cross sections of the front and rear beams 52 and 53 at the front portion are formed in a U-shape that opens toward the front and rear, and the bottoms of the front and rear beams 52 and 53 at the center in the longitudinal direction of the rear member 36 are formed. The face plates 52a and 53a are overlapped and joined, and the joining surface 55 of the bottom plates 52a and 53a is positioned in the vicinity of the ball center 43a of the ball 43 of the connecting body 37. Alternatively, the vehicle suspension described in 3 is provided.

In addition, in this section, the reference numerals and drawing numbers appended to the above terms are not intended to limit the technical scope of the present invention to the “Example” section and the contents of the drawings described later.

  The effects of the present invention are as follows.

According to the first aspect of the present invention, a pair of left and right sides that extend in the front-rear direction of the vehicle body, and whose front end portions are pivotally supported on the vehicle body by a pivotal support so that each rear end portion can support a wheel and swing up and down. Vehicle suspension comprising a suspension frame having a suspension arm having a suspension member and a cross member that spans the left and right arms and connects the two arms.
The cross member is formed in an X shape in a plan view of the vehicle body, and the front and rear end portions on the left and right sides of the cross member are coupled to the front and rear end sides of the corresponding arm. doing.

Here, when the vehicle turns, a large bending moment may be given to each arm due to an external force from the wheel side toward the width direction of the vehicle body. However, according to the present invention, after the external force is transmitted as an axial force mainly from the left and right rear end portions on the wheel side of the X-shaped cross member to the left and right front end portions, Supported by the vehicle body. Therefore, as compared to the case where the external force from the wheel side acts as a bending moment on each arm as in the conventional technique described above, each of these arms strongly counters the above external force with sufficient rigidity.

Further, as described above, the strong opposition of each arm against the external force applied to each arm from the wheel side can be achieved by forming the cross member in a simple X shape, It is not necessary to increase the cross-sectional area of each arm or cross member, or to apply a material with high rigidity. Therefore, the suspension can be made smaller and lighter, and the production cost can be reduced, even when the arms can firmly counteract the external force applied to the arms from the wheel side when the vehicle turns. Can do.

According to a second aspect of the present invention, the cross member is installed on each front end side of the left and right arms, and the front member is bent so that a midway portion in the longitudinal direction thereof protrudes toward the rear of the vehicle body. The rear member that is installed on the rear end side of each of the members and bent so that the middle part in the longitudinal direction thereof is convex toward the front of the vehicle body, and the tops of the front and rear members that are bent are connected to each other in a rotatable manner. And a connecting body.

Here, when the vehicle turns, the front and rear members of the cross member are elastically torsionally deformed, and when torsional stress is generated on the front and rear members,
Although the maneuverability of the vehicle is improved, when the cross member is torsionally deformed in this way,
In plan view of the vehicle body, stress concentration tends to occur at the intersections of the X-shaped cross members.

However, according to the said invention, the top parts by each bending | flexion of the said front and rear member corresponding to the X-shaped cross | intersection part are connected by the connection body which enables these to rotate. For this reason, stress concentration is prevented from occurring between the tops of the front and rear members. Therefore, as described above, the life of the suspension can be improved while the vehicle operability is improved.

In the invention of claim 3, the connecting body is positioned above a space surrounded by imaginary lines connecting the end portions of the front and rear members, respectively, as viewed from the line of sight in the front-rear direction of the vehicle body, The following effects occur.

That is, when the vehicle turns left, for example, the center of gravity of the vehicle body moves to the right so as to move away from the turning center due to the centrifugal force. Tilt right with respect to the road surface. At this time, the front end of each arm pivotally supported by the pivoting tool with respect to the vehicle body tilts to the right together with the vehicle body, but because each wheel remains in contact with the road surface, each wheel, The rear end side of each of the arms supporting the wheels and the rear side of the cross member are defined by the elastic deformation of the arms and the cross member to the vehicle body on the lower side of the connection body around the connection body. Rotate to the right.

Then, when the rightward rotation of each wheel centered on the connecting body is seen in a plan view of the vehicle body, the respective wheels are rotated rightward around the pivotal support. . Accordingly, among the left and right wheels, a roll steer in which the left wheel is toe-out on the reband side and the right wheel is toe-in on the bump side is obtained, and the understeer is strengthened. As a result, the operability of the vehicle can be improved more reliably with a simple configuration.

  Note that the same effect as described above is produced when the vehicle turns to the right.

According to a fourth aspect of the present invention, one of the front and rear members is formed of a rigid long material that is a bar or pipe material.

For this reason, as described above, when the front member and the rear member of the cross member are torsionally deformed when the vehicle turns, a larger torsional stress is generated by the long rigid member having a high torsional rigidity. Therefore, this rigid long material works effectively as a stabilizer, and the handling stability of the vehicle is further improved accordingly.

Further, the above-described bar material and pipe material have a simple structure and can be easily formed. Therefore, the rigid long material can ensure a large torsional rigidity at a low cost.
The production cost of the suspension can be reduced.

According to a fifth aspect of the present invention, the coupling body is a ball joint type universal joint, each section in the longitudinal direction of the front member is U-shaped or U-shaped opening forward, and each of the front members Each torsional center line due to a torsional moment in the cross-sectional view on the side portion side passes through each vicinity of the center of the pivotal support and the ball center of the ball of the coupling body, and the following effects are obtained. Arise.

That is, when the vehicle turns, the front and rear members of the suspension cross member are elastically torsionally deformed, and at this time, the torsional stress generated in the cross member improves the operability of the vehicle. Due to torsional deformation, stress concentration tends to occur at the intersection of the X-shaped cross member.

However, the center of the pivotal support described above is the pivotal support center of the suspension with respect to the vehicle body, and the ball center of the ball of the coupling body is the center of rotation between the front and rear members of the cross member of the suspension. As described above, the torsional center lines of the side members of the front member pass through the vicinity of the center of the pivotal support and the ball center of the ball of the connecting body.

Thus, each side portion of the front member, and reasonably torsional deformation on the torsion around the center line with the torsional deformation of the cross member, the stress concentration occurs at the intersection of the cross member is more reliably To be prevented. Therefore, while improving the maneuverability of the vehicle,
An improvement in the life of the suspension is achieved more reliably.

According to a sixth aspect of the present invention, the connecting body is a ball joint type universal joint, and the rear beam is arranged before and after the rear members are arranged in parallel at the front and rear sides of the left and right arms. The cross section of the front and rear beams in the middle part in the longitudinal direction of the rear member has a U-shape that opens toward the front and rear, and the front and rear in the longitudinal center part of the rear member The respective bottom plates of the beam are overlapped and coupled, and the coupling surface of these bottom plates is positioned in the vicinity of the ball center of the ball of the coupling body, and the following effects are produced.

That is, when the vehicle turns, the front and rear members of the suspension cross member are elastically torsionally deformed, and at this time, the torsional stress generated in the cross member improves the operability of the vehicle. Due to torsional deformation, stress concentration tends to occur at the intersection of the X-shaped cross member.

However, the torsional center line of the rear member described above tends to be located on the coupling surface between the bottom plates of the front and rear beams of the rear member. As described above, the coupling surface is located in the vicinity of the ball center of the ball of the connecting body, which is the center of rotation of the front and rear members of the suspension cross member.

For this reason, it is more reliably prevented that the rear member is torsionally deformed around the torsional center line due to the torsional deformation of the cross member, and stress concentration is generated at the crossing portion of the cross member. Therefore, the improvement in the life of the suspension is achieved more reliably while the vehicle operability is improved.

  The invention according to a seventh aspect has the effects obtained from the fifth and sixth aspects.

Example 1 is shown and is a plan view. Example 1 is shown and is a rear view. 1 is a perspective view of the first embodiment shown in FIGS. FIG. 2 shows a second embodiment and corresponds to FIG. FIG. 5 shows Example 2 and is an enlarged cross-sectional view taken along the line V-V in FIG. 4. FIG. 5 shows Example 2 and is an enlarged cross-sectional view taken along line VI-VI in FIG. 4. FIG. 10 is a diagram illustrating Example 3 and corresponding to FIG. 1. FIG. 8 is a perspective view of the third embodiment shown in FIG. 7. FIG. 10 shows a fourth embodiment and corresponds to FIG.

With regard to the vehicle suspension of the present invention, each arm of the suspension can be strongly opposed to the external force from the wheel side when the vehicle turns, and even in this case, the suspension can be made small and lightweight. In order to achieve the purpose of making the production cost low, the form for carrying out the present invention is as follows.

That is, the suspension of the vehicle extends in the front-rear direction of the vehicle body, and a pair of left and right ends whose front end portions are pivotally supported on the vehicle body by the pivotal support so that each rear end portion can support a wheel and swing up and down. Suspension arms and a cross member that is erected on the left and right arms and connects the two arms. The cross member is formed in an X shape in a plan view of the vehicle body, and the front and rear end portions of the left and right side portions of the cross member are coupled to the front and rear end portions of the corresponding arm. Is done.

In order to describe the present invention in more detail, Example 1 will be described with reference to FIGS.

1-3, the code | symbol 1 in a figure is a vehicle illustrated by the motor vehicle, and the arrow Fr has shown the front of the advancing direction of this vehicle 1. In FIG. The left and right described below refer to the width direction of the vehicle body 2 of the vehicle 1 toward the front. In addition, the bond described below, unless otherwise specified,
It shall mean joining by welding.

The vehicle 1 includes a pair of left and right rear wheels 4 and 5 suspended by a suspension 3 at a rear portion of the vehicle body 2, and the vehicle body is constituted by the suspension 3, the rear wheels 4 and 5, and a pair of left and right front wheels (not shown). 2 is supported on the traveling road surface 6. The vehicle body 2, the suspension 3, and the left and right wheels 4 and 5 are symmetric with respect to a vehicle body center line 7 that passes through the center of the vehicle body 2 in the width direction.

The suspension 3 includes a metal suspension frame 9. The suspension frame 9 is fastened to a pair of left and right suspension arms 10 and 11 that are separated from each other in the width direction of the vehicle body 2 and extend in the front-rear direction of the vehicle body 2, and the rear end portions of the arms 10 and 11, respectively. A wheel support 12 that rotatably supports the wheels 4 and 5;
The front end portions of the arms 10 and 11 are pivotally supported on the vehicle body 2 so that the rear end portions of the arms 10 and 11 support the wheels 4 and 5 by the wheel support 12 and can swing up and down. Pivoting tool 1
3 and a cross member 14 that spans the left and right arms 10 and 11 and couples both the arms 10 and 11.

The suspension 3 includes a coil spring 15 and a shock absorber 16 which are interposed between the vehicle body 2 and the suspension frame 9 and are shock absorbers whose axial centers extend in the vertical direction.

Each of the arms 10 and 11 is formed of a rectangular band-shaped plate (flat bar) 18 whose cross section in the longitudinal direction is long in the vertical direction. Each of the arms 10 and 11 has the same shape and the same cross section, and is made of the same material and made of metal (steel) having a certain degree of elasticity. The wheel support 12 includes a pedestal portion that is coupled to the cross member 14 by fastening or the like, and an axle portion that protrudes from the pedestal portion and rotatably supports the wheels 4 and 5.

Each pivot support 13 is coupled to the front end of each of the arms 10 and 11 and has a cylindrical body 20 whose axial center extends in the vertical direction, and is located on the axial center of the cylindrical body 20. A pipe-shaped pivot shaft 21 that passes through the body 20 and is fixed to the vehicle body 2 is interposed between the cylindrical body 20 and the pivot shaft 21, and is vulcanized and bonded to these 20 and 21. And a rubber bush 22 that elastically connects the members 20 and 21 to each other. Note that the axial direction of the cylindrical body 20 and the pivot shaft 21 depends on the vehicle body 2.
Any of the front and rear, left and right, up and down, and tilt directions may be used.

The cross member 14 extends in the width direction of the vehicle body 2 and is installed at the front end portions of the left and right arms 10 and 11, and is bent so that a midway portion in the longitudinal direction thereof is convex toward the rear of the vehicle body 2. 35, a rear member 36 that extends in the width direction of the vehicle body 2 and is erected on the rear end portions of the left and right arms 10 and 11 and bent so that a midway portion in the longitudinal direction thereof is convex toward the front of the vehicle body 2. The connecting body 3 for connecting the top portions of the front and rear members 35, 36 so as to be pivotable with each other.
7. In this case, the tops of the front and rear members 35 and 36 described above are
Each of the rear members 35 and 36 corresponds to the central portion in the longitudinal direction, and is a plan view of the vehicle body 2 (FIG. 1).
It is located on the vehicle body center line 7. The cross member 14 is formed by the front and rear members 35 and 36 and the connecting body 37 so as to have an X shape as a whole in a plan view of the vehicle body 2 (FIG. 1).

The front member 35 is formed of a rigid long material that is a pipe material having a circular cross section. In addition,
The front member 35 may be formed by pressing the pipe material so as to have a flat shape, and then bending the cross-section so as to have a C shape or an L shape. Alternatively, it may be formed of a rigid long material which is a rod having a polygonal cross section or a triangular cross section. Further, the front member 35 may be indirectly coupled to the front end portions of the left and right arms 10 and 11 via the pivot supports 13, and the rear member 36 is connected to the wheel supports 12. You may couple | bond with each rear-end part of the said left-right arms 10 and 11 indirectly.

The rear member 36 is disposed between a pair of front and rear strip-shaped plates 18 and 18 each having a longitudinal section that is long in the longitudinal direction, and the longitudinal ends of both strip-shaped plates 18 and 18. And a high-rigidity bulkhead 40 that joins both ends to each other. The two band-shaped plates 18, 18 face each other at a distance from each other in the front-rear direction of the vehicle body 2 (thickness direction of each band-shaped plate 18). It is supposed to gradually decrease from the side toward the center.

The front end portions of the left and right arms 10 and 11 are coupled to the cylindrical body 20 of the pivotal support 13 through the end portions of the front member 35 in the longitudinal direction. The rear ends of the left and right arms 10 and 11 are coupled to the bulkhead 40 of the rear member 36. A lower end, which is one end of the shock absorber 16, is disposed in the internal space between the front and rear belt-shaped plates 18, 18 at each longitudinal end of the rear member 36, and the lower end of the shock absorber 16 is It is pivotally supported so as to straddle the front and rear belt-shaped plates 18, 18. On the other hand, the upper end which is the other end of the shock absorber 16 is connected to the vehicle body 2 side.

The cross-sectional shape of each band-shaped plate 18 of the arms 10 and 11 is larger than that of each band-shaped plate 18 of the rear member 36, but may be the same shape and the same size. Each band-shaped plate 18 may have a larger (or smaller) cross-sectional shape as it goes in one longitudinal direction. Further, of the front and rear members 35 and 36 in front of the cross member 14, the front member 35 is the pair of front and rear belt-shaped plates 18 and 18, or one belt-shaped plate 1.
8 and the rear member 36 may be made of a rigid long material. In addition, the front and rear belt-shaped plates 1
There may be three or more, and 18 and 18 may be combined in surface contact with each other.

The connecting body 37 is a ball joint type universal joint. The connecting body 37 is sandwiched between a ball 43 fixed by a fastener 42 at the longitudinal center of the front member 35 and the front and rear belt-shaped plates 18 at the longitudinal center of the rear member 36. And a socket 44 which is fixed to the belt-shaped plates 18 and 18 by a fastener and has the ball 43 in a three-dimensionally rotatable manner around the ball center 43a.

When the vehicle 1 is traveling, when an impact force is to be applied to the vehicle body 2 side through the wheels 4 and 5 and the suspension frame 9 from the uneven portion of the traveling road surface 6, the wheels 4 and 5 are
The energy based on the impact force is absorbed by the shock absorbers of the coil spring 15 and the shock absorber 16 that swing up and down together with the suspension frame 9, and the impact force is alleviated. The operability is maintained well.

Further, when the vehicle 1 turns, the left and right arms 10 and 11 of the suspension frame 9 are relatively displaced in the vertical direction, and the cross member 14 installed on the left and right arms 10 and 11 is elastically twisted and deformed. When a torsional stress is generated in the cross member 14, the cross member 14 functions not only as a stabilizer but also as a torsion bar, so that the vehicle 1 can be stably turned and the operability of the vehicle 1 is improved. .

Further, when the vehicle 1 is turning, the arms 10 and 11 may be given a large bending moment due to an external force directed from the wheels 4 and 5 toward the width direction of the vehicle body 2. As described above, the X-shaped cross member 14 is supported by the vehicle body 2 after being transmitted mainly as an axial force from the left and right rear end portions on the wheels 4 and 5 side to the left and right front end portions. The Therefore, as compared with the case where the external force from the wheels 4 and 5 side acts as a bending moment on the arms 10 and 11 as in the prior art described above, these arms 10 and 11 are used.
Strongly opposes the external force with sufficient rigidity.

Further, as described above, the fact that the arms 10 and 11 strongly counteract the external force applied to the arms 10 and 11 from the wheels 4 and 5 side forms the cross member 14 in a simple X shape. This can be achieved, and it is not necessary to increase the cross-sectional area of each part of the arms 10 and 11 or the cross member 14 or to apply a material having a high rigidity. Therefore, even when the arms 10 and 11 can be strongly opposed to the external force applied to the arms 10 and 11 from the wheels 4 and 5 when the vehicle 1 turns, the suspension 3 is small and lightweight. And the production cost can be reduced.

Further, as described above, the cross member 14 is installed on the front end side of each of the left and right arms 10, 11, and the front member 35 is bent so that a midway portion in the longitudinal direction thereof is convex toward the rear of the vehicle body 2. A rear member 36 that is installed on the rear end side of each of the left and right arms 10 and 11 and bent so that a midway portion in the longitudinal direction thereof is convex toward the front of the vehicle body 2, and the front and rear members 3.
It has the connection body 37 which connects the top parts by each bending of 5 and 36 so that rotation is possible.

Here, when the left and right arms 10 and 11 of the suspension frame 9 are relatively displaced in the vertical direction when the vehicle 1 turns, the front and rear members 35 of the cross member 14 installed on the left and right arms 10 and 11 are placed. , 36 are elastically torsionally deformed, and torsional stresses are generated in the front and rear members 35, 36, respectively. Then, due to the torsional stress generated in the cross member 14, the cross member 14 mainly functions as a stabilizer, a stable turn is obtained in the vehicle 1, and the operability of the vehicle 1 is improved.

Further, as described above, when the left and right arms 10 and 11 are relatively displaced in the vertical direction and the cross member 14 is torsionally deformed, the cross member 14 having an X shape in a plan view of the vehicle body 2 (FIG. 1). Stress concentration tends to occur at the intersections.

However, according to the above configuration, the front and rear members 35 and 36 corresponding to the X-shaped intersections are provided.
The apexes of each of the bends are connected to each other by a connecting body 37 that enables them to rotate.
For this reason, stress concentration is prevented from occurring between the top portions of the front and rear members 35 and 36. Therefore, as described above, the life of the suspension 3 is improved while the operability of the vehicle 1 is improved.

In FIG. 2, when the vehicle body 2 indicated by the solid line and the two-dot chain line in FIG. 2 is viewed from the line of sight in the front-rear direction, the phantom of the three-dot chain line connecting the end portions of the front and rear members 35 and 36, The center point of the ball 43 of the connecting body 37 is positioned above the space 46 surrounded by the line.

According to the above configuration, when the vehicle 1 makes a left turn, for example, the center of gravity of the vehicle body 2 of the vehicle 1 moves rightward away from the turning center due to the centrifugal force, so the vehicle 1 heads in the front-rear direction. As seen from the line of sight, the vehicle body 2 is tilted to the right with respect to the traveling road surface 6 (a chain line in FIG. 2). On this occasion,
The front ends of the arms 10 and 11 of the suspension frame 9 pivotally supported by the pivotal support 13 with respect to the vehicle body 2 are tilted to the right together with the vehicle body 2, but the wheels 4 and 5 are connected to the road surface 6.
The wheels 4, 5 and the rear end side of the arms 10, 11 supporting the wheels 4, 5 and the rear side of the cross member 14 are suspension frames. 9, the arm 10, 11 and the cross member 14 are elastically deformed so as to rotate rightward relative to the vehicle body 2 below the connecting body 37 with the connecting body 37 as a center (the chain line in FIG. 2).

Then, when the rightward rotation of the wheels 4 and 5 around the connecting body 37 is viewed in a plan view of the vehicle body 2 in FIG. , 5 are the pivot supports 13 described above.
It is none other than turning to the right around the center. Therefore, among the left and right wheels 4 and 5, a roll steer is obtained in which the left wheel 4 is toe-out on the reband side and the right wheel 5 is toe-in on the bump side, and the understeer is strengthened. As a result, the operability of the vehicle 1 can be more reliably improved with a simple configuration.

  Note that the same effect as described above also occurs when the vehicle 1 makes a right turn.

Further, as described above, any one of the front and rear members 35 and 36 is formed of a rigid long material that is a bar material or a pipe material.

Therefore, as described above, when the vehicle 1 turns, when the left and right arms 10 and 11 are relatively displaced in the vertical direction and the front and rear members 35 and 36 of the cross member 14 are torsionally deformed, the torsional rigidity is large. Larger torsional stresses are generated by the rigid long material. Therefore, this long rigid material particularly effectively functions as a stabilizer, and accordingly, the operability of the vehicle 1 is further improved.

Further, the above-described bar material and pipe material have a simple structure and can be easily formed. Therefore, the rigid long material can ensure a large torsional rigidity at a low cost.
The production cost of the suspension 3 can be reduced.

The following FIGS. 4 to 9 show Examples 2 to 4. Each of these Examples 2 to 4 is common in many respects to the configuration and operational effects of Example 1. Therefore, regarding these common items, common reference numerals are attached to the drawings, and redundant description thereof is omitted, and different points are mainly described. In addition, the configurations of the respective parts in each of these embodiments may be variously combined in light of the object and the effect of the present invention.

In order to explain the present invention in more detail, the second embodiment will be described with reference to FIGS.

4 to 6, the pivot support 13 has the cylindrical body 20, the pivot shaft 21, and the rubber bush 22 as described above, and the pivot shaft 21 on the axis of the pivot shaft 21. The central portion in the axial direction is the center 48 of the pivotal support 13. On the other hand, the connecting body 37 is a ball joint type universal joint as described above, and includes a fastener 42, a ball 43, and a socket 44. The ball 43 is coupled to the central portion in the longitudinal direction of the front member 35 by fastening with a fastener 42, and the socket 44 is coupled to the central portion in the longitudinal direction of the rear member 36 by welding.

The front member 35 has a U-shape in which each cross section in the longitudinal direction is open toward the front. The cross section of the front member 35 may be a U-shape, not strictly limited to a U-shape or a U-shape, and may be an intermediate shape between them.

Each torsional center line 49 due to a torsional moment T1 around the centroid in the cross-sectional view (FIG. 6) on the left and right side portions of the front member 35 is respectively the center 48 of the pivotal support 13 and the connecting body 37. The ball 43 passes through the vicinity of the ball center 43a.

The rear member 36 has front and rear beams 52 and 53 that are arranged side by side in front and rear and are respectively installed on the rear end portions of the left and right arms 10 and 11 via the bulkhead 40. These front and rear beams 52 and 53 are bent so that the middle portions in the longitudinal direction thereof are convex toward the front of the vehicle body 2, and have a mountain shape in a plan view of the vehicle body 2 (FIG. 4).

Each cross section in the longitudinal direction of the front beam 52 in the midway portion of the rear member 36 in the longitudinal direction has a U-shape that opens forward. In addition, each longitudinal section of the rear beam 53 at the middle portion of the rear member 36 in the longitudinal direction has a U-shape that opens rearward. The cross sections of the front and rear beams 52 and 53 are opposite in the front-rear direction.
They are the same shape and size. The front and rear beams 52 and 53, although the respective units sectional substantially over its entire longitudinal direction, respectively, are a U-shaped, only the central portion in the longitudinal direction may be shaped in cross-section U.

The bottom plates 52a and 53a constituting the middle portions in the width direction of the front and rear beams 52 and 53 at the center in the longitudinal direction of the rear member 36 are overlapped with each other and joined by welding. In other words, the front and rear beams 5 in the central portion of the rear member 36 in the longitudinal direction.
2,53 are coupled to each other back to back. The coupling surfaces 55 of the bottom plates 52 a and 53 a are positioned in the vicinity of the ball center 43 a of the ball 43 of the coupling body 37.

The other torsional center lines 58 due to other torsional moments T2 around the centroid in the cross-sectional view (FIG. 6) on the left and right side parts of the rear member 36 are the front side of each side part of the rear member 36. The center portion between the rear beams 52 and 53, the ball center 43a of the ball 43 of the coupling body 37, and the vicinity of the coupling surface 55 are passed. In this case, the central portion between the front and rear beams 52 and 53 substantially coincides with the centroids of the cross sections in the longitudinal direction on the respective side portions of the rear member 36.

According to the above-described configuration, the connecting body 37 is a ball joint type universal joint, each cross section in the longitudinal direction of the front member 35 is U-shaped or U-shaped opening forward, and the front member 35 each side portion of the cross section (FIG. 6) each torsion center line 49 by torsional moment T1 of around is, each respective ball center 43a of the ball 43 at the center 48 and the connecting member 37 of the pivotal支具13 It passes through the vicinity, and the following effects occur.

That is, when the vehicle 1 turns, the left and right arms 10 and 11 of the suspension frame 9 of the suspension 3 are relatively displaced in the vertical direction, and the front and rear members 35,
Each of the members 36 is elastically torsionally deformed. At this time, the torsional stress generated in the cross member 14 causes the cross member 14 to function as a stabilizer, thereby improving the operability of the vehicle 1. Thus, stress concentration tends to occur at the intersection of the X-shaped cross member 14.

However, the center 48 of the pivot support 13 is the pivot support center of the suspension frame 9 of the suspension 3 with respect to the vehicle body 2 and the ball center 4 of the ball 43 of the coupling body 37.
3a denotes front and rear members 35, 3 of the cross member 14 of the suspension frame 9.
In this case, as described above, the torsional center lines 49 of the side members of the front member 35 are the center 48 of the pivotal support 13 and the ball of the connecting body 37. 43 passes through the vicinity of the ball center 43a.

Thus, each side portion of the front member 35, it was reasonably torsional deformation to the torsion center line 49 about due to torsional deformation of the cross member 14, stress concentration at the intersection of the cross member 14 resulting Is more reliably prevented. Therefore, while improving the operability of the vehicle 1, the life of the suspension 3 can be improved more reliably.

Further, sea urchin I mentioned above, the connecting member 37 and the ball joint type of universal joint, before the rear member 36, before being respectively bridged to each rear end of the left and right arms 10, 11 are arranged after Each of the front and rear beams 52 and 53 in the middle in the longitudinal direction of the rear member 36 is formed into a U-shape that opens frontward and rearward. 36, the bottom plates 52a and 53a of the front and rear beams 52 and 53 at the center in the longitudinal direction are overlapped and coupled, and the coupling surface 55 of these bottom plates 52a and 53a is connected to the ball 43 of the coupling body 37. Is located in the vicinity of the ball center 43a, and the following effects are produced.

That is, although the above contents are repeated, when the vehicle 1 turns, the left and right arms 10 and 11 of the suspension frame 9 of the suspension 3 are relatively displaced in the vertical direction, and the front and rear members 35 and 36 in the cross member 14 are respectively moved. The cross member 14 acts as a stabilizer due to the torsional stress generated in the cross member 14 at this time, and the operability of the vehicle 1 is improved. On the other hand, the torsional deformation of the cross member 14 causes the X Stress concentration tends to occur at the intersection of the cross member 14 having a letter shape.

However, the other twist center line 58 of the rear member 36 described above tends to be located on the coupling surface 55 of the bottom plates 52a and 53a of the front and rear beams 52 and 53 in the rear member 36. As described above, the coupling surface 55 is the ball 4 of the connecting body 37 that is the center of rotation of the front and rear members 35, 36 of the cross member 14 of the suspension frame 9.
3 is located in the vicinity of the ball center 43a.

For this reason, the rear member 36 is torsionally deformed around the other torsional center line 58 along with the torsional deformation of the cross member 14, and stress concentration occurs at the intersection of the cross member 14. It is surely prevented. Therefore, while improving the operability of the vehicle 1, the life of the suspension 3 can be improved more reliably.

Further, as described above, stress concentration is prevented from occurring at the intersection of the cross member 14, and accordingly, the front and rear beams 5 in the central portion in the longitudinal direction of the rear member 36 are correspondingly increased.
Generation | occurrence | production of the peeling of a weld in the connection part of 2,53 is prevented. Therefore, also in this respect, the life of the suspension 3 can be improved.

In the above case, of the left and right sides of the suspension frame 9, the torsion center line 49 on one side and the other torsion center line 58 on the other side are positioned on one straight line, The torsion center line 49 and the other torsion center line 58 at one side are positioned on one other straight line, and the intersection of these two straight lines is the ball 43 of the connecting body 37. It is preferable to be positioned in the vicinity of the ball center 43a.

According to the above, the front and rear members 35 and 36 in the cross member 14 are torsionally deformed around the respective straight lines as the cross member 14 is torsionally deformed when the vehicle 1 is turning. It is more reliably prevented that stress concentration occurs at the intersection of the cross member 14. Therefore, while improving the operability of the vehicle 1, the life of the suspension 3 can be improved more reliably.

In order to explain the present invention in more detail, the third embodiment will be described with reference to FIGS.

7 and 8, the cross member 14 includes first and second members 25 and 26 that intersect in an X shape in a plan view of the vehicle body 2 (FIG. 7), and the first and second members 25. , 26 is provided with a pair of upper and lower reinforcing plates 27, 27 that cover the crossing portion from the outside and are coupled to the crossing portion to reinforce the crossing portion. The reinforcing plates 27 and 27 may be provided with only one of the upper and lower sides.

The first and second members 25 and 26 are each formed of a rectangular strip 18 that extends linearly and has a cross section of each part in the longitudinal direction that is long in the longitudinal direction. These first and second members 25 and 2
6 are made of metal (steel) having a certain degree of elasticity, with the respective cross-sections having the same shape and size, and the same material. The first and second members 25 and 26 have the same shape and the same cross section in the arms 10 and 11 and the same material.

As shown by a two-dot chain line in FIG. 8, a notch 30 is formed in the lower part of the first member 25 at the intersection of the first and second members 25, 26, and another cut is formed in the upper part of the second member 26. Missing 3
1 is formed. The first and second members 25 and 26 are crossed with each other by fitting the notches 30 and 31 to each other. The first and second members 25 and 26 are joined to each other with the upper and lower surfaces of the intersections being flush with each other. The pair of upper and lower reinforcing plates 27 and 27 are firmly coupled to each other with the intersecting portion of the first and second members 25 and 26 sandwiched from above and below. The reinforcing plate 27 supports the lower end of the coil spring 15.

In the left and right side portions of the cross member 14, the first and second portions corresponding to the front end portions thereof, respectively.
The front end portions of the members 25 and 26 are coupled to the cylindrical body 20 of the pivotal support 13 on the front end side of each of the arms 10 and 11 corresponding thereto. On the other hand, on the left and right side portions of the cross member 14, the rear end portions of the first and second members 25 and 26 corresponding to the rear end portions thereof are rearward of the corresponding arms 10 and 11, respectively. These arms 10 and 1 are integrally formed at the ends.
1 is coupled to the rear end.

In other words, the arm 10 on the left side and the second member 26 of the cross member 14 are one strip-shaped plate 1.
It is formed integrally by bending 8. The right arm 11 and the first member 25 of the cross member 14 are integrally formed by bending a single band-shaped plate 18. The integral joint portion of the arms 10 and 11 and the first and second members 25 and 26 by the band-shaped plate 18 is a U-shape that opens toward the inside of the vehicle body 2 in a plan view of the vehicle body 2. Shaped. The wheel support 12 is fixed to the outer surface of the joint portion formed by the band-shaped plate 18. In addition, a lower end portion which is one end portion of the shock absorber 16 is disposed in an internal space of the joint portion formed by the belt shape plate 18, and the lower end portion of the shock absorber 16 is opposed to each other in the joint portion.
It is pivotally supported so as to straddle both parts. On the other hand, the upper end which is the other end of the shock absorber 16 is connected to the vehicle body 2 side.

The front end portions of the first and second members 25 and 26 correspond to the corresponding arms 1.
The front ends of 0 and 11 may be directly coupled without using the pivotal support 13. The arms 10 and 11 and the first and second members 25 and 26 are separated from each other, and the rear end portions of the first and second members 25 and 26 are connected to the corresponding arms 10. , 11 may be coupled directly to each rear end portion or indirectly via the wheel support 12. The shock absorber 16
Or a lower end portion which is one end portion of the coil spring 15 together with the shock absorber 16 at the front,
The upper end portion which is the other end portion of the coil spring 15 may be connected to the vehicle body 2 side by being supported so as to straddle the rear belt-shaped plates 18 and 18.

Further, the first and second members 25 and 26 of the cross member 14 have a pair of front and rear band-shaped plates 18 and 18, respectively, and these band-shaped plates 18 and 18 are slightly separated from each other in the front-rear direction of the vehicle body 2. You may make it face and extend mutually parallel.

  In order to explain the present invention in more detail, Example 4 will be described with reference to FIG.

In FIG. 9, the left and right arms 10, 1 of the suspension frame 9 in the third embodiment.
1 and the first and second members 25 and 26, the left arm 10 and the first and second members 25,
26 are integrally formed with the band-shaped plate 18, and the right arm 11, the first and second
The right side portions of the members 25 and 26 are integrally formed by the band-shaped plate 18. And
The opposing end portions on the left and right sides of the first and second members 25 and 26 are alternately overlapped and joined.

Further, the left side portion of the first member 25 and the right side portion of the second member 26 are bent so as to form a circular arc shape toward the rear of the vehicle body 2 as a whole, and the right side portion of the first member 25 and the right side portion of the first member 25 are The left side portion of the two member 26 is bent so as to have an arc convex shape as a whole toward the front of the vehicle body 2.

According to the above-described configuration, the components of the suspension frame 9 are integrally formed, so that the number of parts of the suspension frame 9 can be reduced, and the configuration can be simplified. Therefore, the production cost of the suspension 3 can be reduced. .

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Car body 3 Suspension 4 Wheel 5 Wheel 6 Traveling road surface 7 Car body centerline 9 Suspension frame 10 Arm 11 Arm 12 Wheel support 13 Pivoting tool 14 Cross member 15 Coil spring 16 Shock absorber 18 Band-shaped board 20 Cylindrical body 21 Pivot shaft 22 rubber bush 25 first member 26 second member 27 reinforcing plate 35 front member 36 rear member 37 connecting body 40 bulkhead 42 fastener 43 ball 43a ball center 44 socket 46 space 48 center 49 torsion center line 52 front beam 52a Bottom plate 53 Rear beam 53a Bottom plate 55 Bonding surface 58 Other torsion center line T1 Torsion moment T2 Other torsion moment

Claims (7)

A pair of left and right suspension arms that extend in the front-rear direction of the vehicle body and whose front end portions are pivotally supported on the vehicle body by pivotal supports so that the rear end portions of the vehicle body can swing up and down are supported. In a suspension of a vehicle including a suspension frame having a cross member that is installed on an arm and that couples both the arms,
The cross member is formed in an X shape in a plan view of the vehicle body, and the front and rear end portions on the left and right sides of the cross member are coupled to the front and rear end sides of the corresponding arm. A vehicle suspension characterized by that. The cross member is installed on each front end side of the left and right arms, and a front member that is bent so that a middle part in the longitudinal direction thereof is convex toward the rear of the vehicle body, and on each rear end side of the left and right arms. A rear member that is installed and bent so that a midway portion in the longitudinal direction thereof is convex toward the front of the vehicle body, and a connecting body that rotatably connects the top portions of the front and rear members of the respective rear members. The vehicle suspension according to claim 1. The connection body is positioned above a space surrounded by a virtual line connecting the end portions of the front and rear members, respectively, as viewed from the line of sight in the longitudinal direction of the vehicle body. Vehicle suspension as described. 4. The vehicle suspension according to claim 2, wherein one of the front and rear members is formed of a rigid long member that is a bar member or a pipe member. 5. The connecting member and the ball joint type of universal joint, the longitudinal of each part section of the front member forward and open to the U-shaped or U-shaped, cross section around each side portion of the front member 5. The twisting center line according to the torsional moment at the center passes through the vicinity of the center of the pivotal support and the ball center of the ball of the coupling body, respectively. The vehicle suspension according to any one of the above. The connecting body is a ball joint type universal joint, and the rear member has a rear beam before and after the rear member is installed side by side on the rear end side of each of the left and right arms. The cross sections of the front and rear beams in the middle part in the longitudinal direction are formed in a U shape that opens toward the front and rear, and the bottom plates of the front and rear beams in the longitudinal center part of the rear member are overlapped. The suspension of a vehicle according to any one of claims 2 to 4, characterized in that the coupling surfaces of the bottom plates are positioned in the vicinity of the ball center of the ball of the coupling body. . The connecting member and the ball joint type of universal joint, the longitudinal of each part section of the front member forward and open to the U-shaped or U-shaped, cross section around each side portion of the front member Each torsional center line due to a torsional moment at the center passes through the vicinity of the center of the pivotal support and the ball center of the ball of the coupling body,
Before and after the rear member is arranged side by side in front and rear and is installed on the rear end side of each of the left and right arms, the rear member has a rear beam. Each cross-section has a U-shape opening toward the front and rear, and the bottom plates of the front and rear beams at the center in the longitudinal direction of the rear member are joined together, and the bottom plates are joined together. The vehicle suspension according to claim 2 or 3, wherein the surface is positioned in the vicinity of a ball center of the ball of the coupling body.

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