JPH0257413A - Suspension device for automobile - Google Patents

Abstract

PURPOSE:To increase the degree of freedom in the up/down positions of the linking point of a link member by placing the two link members of an arm for linking a wheel supporting member to a vehicle body in such a way that these are separate from each other in a plan view and that the shaft extension of one member intersects to the other. CONSTITUTION:Both upper and lower ends of a wheel supporting member 1 for rotatably supporting the front wheel 2, etc. of an automobile are vertically swingably linked to a vehicle body by means of upper and lower arms 3, 4. The upper arm 3 is formed with mutually independent two link members 3a, 3b. In this case, the first link member 3a is extended in the lateral direction of the vehicle body. The second link member 3b is extended in the longitudinal direction of the body in front of the first link member 3a in such a way that it does not overlap the first link member 3a as seen from above in a plan view and that the shaft extension L2 to the rear thereof intersects to the first link member 3a.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a suspension device for suspending steering wheels of an automobile on a vehicle body, and in particular, a suspension device that includes two arms that connect a wheel support member to the vehicle body in a vertically swingable manner. This relates to a link member consisting of a link member.

(Prior Art) Conventionally, suspension devices for automobiles include a wheel support member that rotatably supports a steered wheel, and an upper arm and a lower arm that connect the upper and lower parts of the wheel support member to the vehicle body so as to be able to swing up and down, respectively. There are also known double wishbone type wheels, and strut type wheels, in which a strut is used in place of the upper arm to connect the upper part of the wheel support member to the vehicle body.

By the way, while the above-mentioned upper arm and lower arm are generally so-called A-type arms that are integrally molded products made of pressed steel plates, those that are made of two link members each having one end directly connected to a wheel support member are also used. may be done. In particular, Japanese Patent Application Laid-Open No. 59-223507 discloses that in order to bring the kingpin offset close to zero or a negative value from the viewpoint of improving maneuverability, the upper arm is composed of two link members, and It is disclosed that the link members are arranged so as to cross each other when viewed in plan from above the vehicle body. Note that the kingpin offset refers to the distance between the kingpin axis and the wheel center axis on the road surface when viewed from the longitudinal direction of the vehicle body. Further, when the arm is composed of two link members, the kingpin axis, which is the steering rotation center axis of the steering wheel, is a straight line passing through the intersection of the axes of the two link members or their extensions.

(Problem to be Solved by the Invention) However, when the two link members constituting the arm are arranged in a crossed state as described above, when the link members swing up and down due to the bump rebound of the steered wheel, the In order to prevent the link members from interfering with each other, it is necessary to separate them to some extent in the vertical direction, and the degree of freedom in setting the position of the connection point of the link member with the vehicle body or wheel support member is correspondingly reduced in the vertical direction. There is a problem.

The present invention has been made in view of the above, and its object is to appropriately set the arrangement of the two link members in an arm consisting of two link members to reduce the kingpin offset. While being freely configurable,
This makes it possible to increase the degree of freedom in the vertical position of the connection point of the link member.

(Means for Solving the Problems) In order to achieve the above object, the solving means of the present invention is a suspension device for an automobile that has an arm that connects a wheel support member that supports a steered wheel to a vehicle body in a vertically swingable manner. death,
It is assumed that the arm consists of two link members each having one end directly connected to a wheel support member. and,
The two link members are positioned apart from each other when viewed from above the vehicle body, and arranged so that the axial extension line of one link member intersects with the other link member.

(Function) With the above configuration, in the present invention, in the two link members constituting the arm, the axial extension line of one link member intersects the other link member in a plane, so this intersection point is The inclination of the king pin axis passing through the link member can be changed by changing the position of the intersection on the other link member, and thereby the king pin offset can be set arbitrarily.

Moreover, since the above two link members do not overlap each other in a plane, even if the two link members are located on the same plane in the vertical direction, the link members will interfere with each other when vertically swinging. Therefore, the degree of freedom in the vertical position of the connection point between the link member and the vehicle body or the wheel support member can be increased.

(Example) Embodiments of the present invention will be described below based on the drawings.

1 to 3 show a double wishbone type front suspension device for an automobile according to a first embodiment of the present invention, in which reference numeral 1 denotes a wheel support member that rotatably supports a front wheel 2; The support member 1 is connected to the vehicle body by an upper arm 3 at its upper end and by a lower arm 4 at its lower end so as to be vertically swingable.

The upper arm 3 is composed of two link members 3a and 3b that are independent of each other, and the link members 3a and 3b are arranged on substantially the same plane above the front wheel 2. Moreover, one link member (of both link members 3a, 3b)
The first link member (hereinafter referred to as the first link member) 3a is arranged to extend substantially in the lateral direction of the vehicle body, and the other link member (hereinafter referred to as the second
The link member 3b extends approximately in the longitudinal direction of the vehicle body forward of the first link member 3a so as not to overlap with the first link member 3a when viewed from above the vehicle body, and has an axis extending to the rear thereof. The line is the first link member 3
It is arranged to intersect with a. One end of both link members 3a and 3b (the outer end of the first link member 3a and the rear end of the second link member 3b) is rotatably connected to the upper end of the wheel support member 1 by a ball joint 5°6, respectively.
and both link members 3a, 3b are directly connected.
The other ends (the inner end of the first link member 3a and the front end of the second link member 3b) are pivotally connected to the vehicle body via rubber bushings 7.8.

On the other hand, the lower arm 4 is composed of one bifurcated member (a so-called A-type arm), the inner end of which is pivotally connected to the vehicle body at two locations, front and rear, via rubber bushes 9, 9, and the outer end is a ball It is rotatably connected to the lower end of the wheel support member 1 by a joint 10.

Further, the wheel support member 1 is formed with an arm portion 1a that projects toward the rear of the vehicle body, and a tie rod 11 of a steering device is connected to the tip of the arm portion 1a. By transmitting the steering force from the steering device to the wheel support member 1, the front wheels 2 are steered left and right around the virtual kingpin axis as steered wheels.

Here, the virtual kingpin axis includes the first
It passes through the intersection P1 of the axis L1 of the link member 3a and the axis extension line L2 of the second link member 3b, and the connection center point P2 between the lower arm 4 and the wheel support member 1 (the center point of the ball joint 10). It is a straight line.

Therefore, in the first embodiment, the upper arm 3 is composed of two link members 3a and 3b, and one of the link members (that is, the first link member)
3a is arranged in the lateral direction of the vehicle body, and the other link member (that is, the second link member) 3b is arranged in the lateral direction of the vehicle body, and the other link member (that is, the second link member) 3b
The kingpin shaft of the front wheel 2 serving as a steered wheel is arranged so that the shaft extension line L2 extending in the front-rear direction of the vehicle body and extending rearwardly intersects the first link member 3a in a plane. It passes through the intersection P1 between the first link member 3a (axis Ll) and the axial extension line L2 of the second link member 3b. Furthermore, by setting the intersection point P1 at a predetermined position on the first link member 3a, that is, in the lateral direction of the vehicle body, the kingpin axis k can be tilted at a desired angle, and the kingpin offset δ can be set to zero or negative from the viewpoint of maneuverability. can be made to approach the value of .

Moreover, since the two link members 3a and 3b do not overlap each other in plan view, the two link members 3a and 3b do not overlap with each other in plan view.
Even when a and 3b swing up and down with the bump rebound of the front wheel 2, there is no interference between the members. Therefore, both the link members 3a, 3b can be arranged on the same plane in the vertical direction as in the embodiment, and the link members 3a, 3b
The degree of freedom in the vertical position of the vehicle body side connection points (rubber bushes 7.8) and the wheel support member side connection points (ball joints 5, 6) can be increased.

4 and 5 show a suspension device according to a second embodiment of the present invention. In the case of the second embodiment, the two link members 3a and 3b constituting the upper arm 3 are arranged at slightly different heights in the vertical direction near the upper side of the center of rotation of the front wheel 2, which is the steered wheel. Further, the first link member 3a is arranged in the lateral direction of the vehicle body, while the second link member 3b is arranged so as not to overlap with the first link member 3b when viewed from above the vehicle body. The first link member 3 extends at an angle toward the inside of the front vehicle body at a position on the front side of the member 3b, and the axial extension line to the rear thereof is the first link member 3.
It is arranged to intersect with a.

6 and 7 show a suspension device according to a third embodiment of the present invention. In the case of this third embodiment,
Lower arms 4 each have one end connected to a wheel support member 2
The link members 4a, 4b are located slightly apart from each other when viewed from above the vehicle body, and the axial extension line of one link member 4a is the same as that of the other link member 4b. are arranged to intersect.

Furthermore, FIGS. 8 and 9 show a suspension device according to a fourth embodiment of the present invention. In the case of this fourth embodiment, the lower arm 4 is constituted by two link members 4a and 4b as in the case of the third embodiment, and this link member 4a.

The difference is that 4b is arranged at slightly different levels in the vertical direction.

In any of the second, third and fourth embodiments, as in the first embodiment, the inclination angle or kingpin offset of the kingpin axis can be set as appropriate, and the link member 3a , 3b or 4a
, 4b on the vehicle body side and on the wheel support member side, the degree of freedom in the vertical position can of course be increased.

(Effects of the Invention) As described above, according to the suspension device for an automobile according to the present invention, the two link members constituting the arm can be connected to the axis of one link member without overlapping each other when viewed from above the vehicle body. By arranging the extension line so that it intersects with the other link member, it is possible to increase the degree of freedom in the vertical position of the connection point of the ring member while ensuring an appropriate setting of the king pin offset, making it easier to implement. This is extremely advantageous for achieving this goal.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIGS.
The drawings show a first embodiment, in which Fig. 1 is a rear view of an automobile suspension device, and Figs. 2 and 3 are plan views taken along line A-A and line B-B in Fig. 1, respectively. be. 4 and 5 show a second embodiment, FIG. 4 is a schematic plan view of the suspension device, and FIG. 5 is a schematic side view of the suspension device. FIG. 6 and FIG. 7 are a diagram equivalent to FIG. 4 and FIG. 5, respectively, showing the third embodiment, and FIGS. 8 and 9 are a diagram equivalent to FIG. This is a diagram equivalent to Figure 5.

Claims (1)

[Claims] (1) It has an arm that connects a wheel support member that supports a steered wheel to the vehicle body in a vertically swingable manner, and the arm is composed of two link members each having one end directly connected to the wheel support member. In the suspension device, the two link members are located apart from each other when viewed from above the vehicle body, and are arranged such that the axial extension line of one link member intersects the other link member. Features of automobile suspension equipment.