JPS638008A - Suspension for automobile - Google Patents

Abstract

PURPOSE:To improve riding sensation, by a method wherein, in a dual link type suspension device, a coupling rod is spanned between the car body pivotally securing parts of suspension arms on both sides, and the two arms are intercoupled so as to swing independently from each other. CONSTITUTION:When a lateral force in the direction of an arrow mark X is exerted on rear wheels 6a and 6b during turn, the lateral force is transmitted to suspension arms 1b and 2b through front and rear suspension arms 1a and 2a and coupling rods 7a and 7b. In this case, since a coupling part 8 between each of 1a, 2a, 1b, and 2b and each of the coupling rods 7a and 7b is so formed as to allow independent swing of the arms from each other, a rubber bushes contained in the housings 8 share a lateral force with each other for independent swing. This constitution enables reduction of the spring constant of the rubber bush, and improvement of riding sensation.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an automobile suspension, and more specifically, a front suspension arm located at the front in the longitudinal direction of the vehicle and a rear suspension arm located at the rear on both sides of the vehicle body. The present invention relates to a so-called dual-link type suspension for an automobile, in which one end of an arm is pivotally connected to the arm via a rubber bush so as to be able to swing freely in the vertical direction, and left and right rear wheels are supported at the free ends of both of these spanning arms.

(Prior Art) In general, this type of dual link suspension has one end of the front suspension arm and one end of the rear suspension arm on both sides of the vehicle body, as shown in Japanese Utility Model Publication No. 58-190206, for example. The left and right rear wheels are pivotally connected via rubber bushings, and the left and right rear wheels are supported at the free ends of both the Subensigon arms, which are pivotally connected to both sides of the vehicle body.

(Problems to be solved by 潴呵) By the way, in the suspension of the above structure, for example, when a car turns, a larger side force acts on the outer ring than on the inner ring located on the center side of the turning.

Therefore, in the above-described conventional suspension, it is necessary to increase the spring constant of the rubber bushing interposed in the pivot portion of the suspension arm on the vehicle body side to make it hard enough to withstand the side force. If the spring constant of the rubber bushing is increased, the unevenness of the road surface will be more likely to be transmitted from the suspension arm to the vehicle body during normal driving, resulting in a problem that the ride comfort will be reduced accordingly.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to distribute the side force that acts as the vehicle turns to rubber bushings that are interposed in the pivot points of the left and right suspension arms on the vehicle body side. The purpose of the present invention is to provide a suspension cylinder that can soften the spring force of each rubber bushing and improve riding comfort.

(Means for Solving the Problems) According to the present invention, one end of a front suspension arm located at the front in the longitudinal direction of the vehicle body and a rear suspension arm located at the rear side of the vehicle body are connected to one end of the front suspension arm located at the front side in the longitudinal direction of the vehicle body, respectively, through rubber bushings. In an automobile suspension in which the left and right rear wheels are supported at the free end portions of both suspension arms, at least one of the left and right front suspension arms and the rear suspension arm is pivoted to freely swing vertically. The present invention is characterized in that a connecting rod is installed between the pivoting portions of the suspension arms to the vehicle body, and the left and right suspension arms are connected so that each of the suspension arms swings independently.

(Function) According to the present invention, when a larger side force acts on one wheel than the other when the automobile turns, each suspension arm that supports the left and right rear wheels via the connecting rod This can be done by the rubber bushings interposed in the pivot points of the vehicle body.

(Example) An automobile suspension according to the present invention will be described below according to an example shown in the drawings.

In the figure, (la) and (lb) are the front suspension arms arranged in the vehicle width direction on both sides of the rear of the vehicle body (B), and (2a) and (2b) are the front suspension arms (la and 1b). is also a rear suspension arm arranged parallel to these front suspension arms (la) (lb) at the rear, and one end of each of these arms (la) (la) (lb) (2a) (2b) is connected to a rubber bush ( 3) is pivotally connected to a bracket (4) fixed to the vehicle body (B).

Specifically, the rubber bush (3) is vulcanized and bonded between the outer cylinder (31) and the inner cylinder (32) loosely inserted into the outer cylinder (31) on a coaxial rod, while each of the suspensions is A through hole (5) is formed at one end of the arm (la) (lb) (2a) (2b), and each suspension arm (la) (lb) (2a) ( 2b)
Inserting the rubber bushing (3) into one end of the
The suspension arm (la) (lb) (2a)
The outer cylinder (31) is welded to (2b).

A pair of opposing walls (41) (41) are provided on the lower surface of the vehicle body (B).
) is fixed, and the inner tube (
32), the suspension arms (la), (lb), and (2a) are connected to each other through the shaft (42).
One end of (2b) is pivotally connected.

(E3a) (8b) is the wheel support (61a)
(E3 l b), the left and right rear wheels are rotatably supported on the vehicle body (E3 l b), and one wheel support (81a) is attached to the vehicle body (
It is assembled to the free end of the front side suspension arm (la) and the rear side suspension (2a) which are pivoted on the - side of B), and the other wheel support (61b)
is attached to the free ends of the front suspension arm (1b) and the rear suspension arm (2b) which are pivotally connected to the other side of the vehicle body (B).

However, in the embodiment shown in the figure in the suspension system having the above configuration, the front suspension arms (1a) and (1b) disposed on the left and right sides of the vehicle body (B) are connected to the vehicle body (B).
between the pivot joint and the rear suspension arm (2a
Connecting rods (7a) and (7b) are respectively installed between the pivot joints of the left and right suspension arms (1a) and (2b) to the vehicle body (B), respectively.
b) for each suspension arm (la) (lb)
) (2a) and (2b) are connected so that they swing independently.

That is, to specifically explain the connecting portion between the front suspension arm (1a) and the connecting rod (7a) shown in FIGS. 2 and 3 as an example, the longitudinal end portion of the connecting rod (7a) A housing (8) having a housing chamber (80) for accommodating the In(B)(ll) attachment portion of the suspension arm (la) is integrally formed on the outer surface of the housing (8) in the vehicle width direction. and the front and rear of the car,
An opening (81) that communicates the storage chamber (80) with the outside.
(82) and (83), and a spherical portion (R) is provided at a pivotally connected portion of the suspension arm (1a) to the vehicle body (B).

Then, the spherical part (R) is inserted into the accommodation chamber (80) through the opening (81) in the housing (8) that opens outward in the vehicle width direction, and the spherical part (R)
and the four corners in the housing (8)
(84), and then a retaining ring (85) is fitted into the opening (81) in the housing (8), and the periphery of the opening (81) is caulked inward. As a result, the suspension arm (1a) and the connection loft (7a) are connected to each other so as to be able to swing relative to each other in the vertical direction using the suspension shaft (42) as a fulcrum.

The connecting rod (7a) thus connected as described above.
and the suspension arm (la) are interposed between the opposing walls (41) (41) of the bracket (4), and the shaft (42) is interposed between the opposing walls (41) (41) of the bracket (4).
1) Insert across the sweep hole (43) formed in (41), the front-rear openings (82) (83) of the nozzing (8), and the inner cylinder (32), and insert the By screwing a nut (44) to the end, one end of the suspension arm (la) is connected to the vehicle body (
It is pivotally connected to B).

In addition, the connecting portion between the front suspension arm (lb) and the connecting rod (7a), the connecting portion between the rear suspension arm (2a) and the connecting rod (7b), and the connecting portion between the rear suspension arm (lb) and the connecting rod (7b). 2b) and the connecting rod (7b) is also the same in structure as the connecting portion between the front suspension arm (1a) and the connecting rod (7a) shown in FIGS. 2 and 3. Omit explanation.

In the figure (82a) and (82b) are the wheel supports (6
1a) Shows a strut bar installed between (6l b) and the body (B).

Next, the operation of the suspension constructed as described above will be explained.

Normally, as the automobile turns, a side force acts on the rear wheels (6a) (6b) as shown by arrows X in Figure 1, and the front and rear suspensions supporting the rear wheels (6a) (6b) Arms (1a) (2a) and (1b) (
2b) is also subjected to a force in the same direction as the side force.

By the way, to explain the case where the rear wheel (6a) located on the left side in Fig. 1 becomes the outer wheel side when the car turns, the side force acting on the left rear wheel (6a) is the side force on the right side, which is the inner wheel. Since the side force acting on the rear wheel (6b) is extremely large compared to the side force acting on the rear wheel (6b), for example, in conventional suspensions, only a rubber bushing is inserted at the pivot point on the vehicle body side of the suspension arm that supports the rear wheel, which is the outer wheel. However, in the above embodiment, the left rear wheel (6
When a large side force acts on a),
Front and rear suspension arm (lb) supporting the right rear wheel (6a) by the connecting rod (7a) (7b)
The side force is also transmitted to (2b), and the rubber bush (3) interposed at the pivot point on the vehicle body (B) side of both suspension arms (la) (2a) and both suspension arms (lb) (2b) The side force is shared by the rubber bush (3) interposed in the pivot joint (11) of the vehicle body, and the support is stopped.

Therefore, each of the rubber bushes (3) can be used with a spring constant lower than that of the conventional rubber bushes, so that the riding comfort of the automobile can be improved accordingly.

Furthermore, when the car turns, the rubber bush (3) bends due to the effect of cornering force, and the rear wheels are steered in the same phase as the front wheels. The above-mentioned steering angle is different between the rear wheel on the inner wheel side and the rear wheel on the inner wheel side, which is not affected much by cornering, and therefore it is difficult to improve the stability of driving.

However, in the above-mentioned embodiment, as schematically shown in FIG. 4, when the rear wheel (6a) located on the left side of FIG. 4 becomes the outer wheel side when the automobile turns, for example, the rear wheel (6a) Due to cornering acting on the wheel (6a), the front suspension arm (1a) supporting the rear wheel (6a) is displaced to the right in FIG. The rear wheel (6a) is displaced to the left in Figure 4 and steered as shown by the two-dot chain line.As the rear wheel (6a) is steered, the inner rear wheel (6b) is turned. At the same time, the supporting front suspension arm (1b) is forcibly displaced to the left in FIG. 4 by the same amount as the displacement position of the front suspension arm (1a) via the connection loft (7a). The rear wheel (
The rear suspension arm (2) supporting the rear suspension arm (6b)
b) is also forcibly displaced to the left in Figure 4 by the same amount as the displacement n of the rear suspension arm (2a) via the connecting rod (7b), as shown by the two-dot chain line in Figure 4. The inner rear wheel (6b) is also steered by the same angle as the outer rear wheel (6a), which improves overall running stability.

On the other hand, for example, when the brakes are applied while driving straight, a force in the direction shown by the arrow Y in FIG. The front suspension arms (la) and (lb) tend to displace outward in the vehicle width direction due to the deflection of the rubber bushes (3), while the rear wheels (8a) (El
b) A rearwardized suspension arm (2a) that supports (
2b) also try to displace inward in the vehicle width direction due to the deflection of the rubber bushes (3), and as a result, in the conventional suspension, the front parts of both rear wheels (6a) and (6b) open outward, and both rear wheels (6a) and (6b) open outward. There is a possibility that the toe angle of the ring (6a) (E3b) may change.

However, in the embodiment described above, each of the suspensions 71177-
Since the displacement of the wheels (1a) (lb) (2a) (2b) is prevented, both the rear wheels (Et a) (E3 b)
The toe of the vehicle does not change, thus increasing the stability of the vehicle during braking.

In the above embodiment, the front suspension arms (1a) (lb) arranged on the left and right sides of the vehicle body (B)
between the pivot joint and the rear suspension arm (2a
) (2b) Connecting rods (7a) (7b) are installed between the pivot points with the vehicle body (B), respectively, and the left and right suspension arms (la), (lb) and (2a)
(2b) Wow, each of these suspension arms (la) (
1b) (2a) (2b) are connected to swing independently, but the front suspension arms (la) and (l)
The connecting rod (7a) may be installed only between the pivot points with the vehicle body (B) in b), or alternatively, the connecting rod (7a) may be installed between the rear suspension arms (2a) and the vehicle body (2b).
The connecting rod (7b) may be installed only between the pivot point with B).

(Effect between parts) As described above, according to the present invention, for example, the side force that acts largely on the rear wheel, which is the outer wheel, when a car turns, is
The load is shared between a rubber bushing installed at the vehicle body side pivot point of the front and rear suspension arms that support the rear wheel, and a rubber bushing installed at the vehicle body side pivot point of the front and rear suspension arm supporting the inner rear wheel. As a result, the spring constant of the rubber bushing can be lowered to improve the ride comfort of the car, and when cornering, the movement of the rear wheel on the outer side, which is steered in the same phase as the front wheel by the cornering fork, can be reduced. Since the information is transmitted to the inner rear wheel through the connecting rod and both rear wheels can be steered at the same angle, driving stability is improved when turning, and when braking while driving straight. Since the toe angle of the rear wheels does not change, the stability of the vehicle during braking can also be increased.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing one embodiment of the present invention, Fig. 2 is a partially cutaway plan view of the same essential parts, Fig. 3 is a sectional view taken along the line ■-■ in Fig. 2, and Fig. 4 is an operation diagram. It is an explanatory diagram showing a cane state. (1a)...Front suspension arm (1b)
...Front suspension arm (2a)...
Rear suspension arm (2b)...rear ([
1 Suspension arm (3)...Rubber bushings (8a) (8b)...Rear wheel

Claims (1)

[Claims] One end of a front suspension arm located at the front in the longitudinal direction of the vehicle body and a rear suspension arm located at the rear side of the vehicle body are respectively pivotally attached to both sides of the vehicle body via rubber bushings so as to be able to swing freely in the vertical direction. In an automobile suspension in which left and right rear wheels are supported at free ends of suspension arms, a connecting rod is provided between a pivot point to the vehicle body in at least one of the front suspension arm and the rear suspension arm. A suspension for an automobile, characterized in that the left and right suspension arms are connected to each other so that the left and right suspension arms swing independently.