JPS6234807A - vehicle suspension system - Google Patents

Abstract

PURPOSE:To lengthen each of arms so as to minimize change in tread by configurating a device in such a way that the swing center for each of an upper and a lower end of right arms is located to the left side of a body center line, and in the sililar manner the said center for left arms is located to the right side of the said line. CONSTITUTION:Each of a right front and a left front wheel 12 is supported by both a wheel support frame 30 and a knuckle 46 which are connected with each of an upper and a lower arm 42 and 44 which are installed on a front frame 24. In this case, each of the upper and lower arms 42 and 44 is made into a forked connection, and each of these arms 42 and 44 which are located to the left side of a vertical plane CF including a body center line, is supported while it is swung as required by each of small projected parts 38 and 40 which are located to the right side of the said vertical plane and is fixed on both the wheel support frame 30 and a front frame 24. In a similar manner, each of the upper and lower arms 42 and 44 which are located to the right side of the said vertical plane, is supported while it is swung as required by each of small projected parts 38 and 40 which are located to the left side of the said vertical plane and is fixed on both the wheel support frame 30 and the front frame 24.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a suspension system for a vehicle, such as a tricycle or a four-wheeled motor vehicle, which is equipped with at least one pair of left and right wheels.

- When a vehicle turns, a rolling phenomenon occurs in which the vehicle body tilts due to centrifugal force, and the outer wheels are displaced upward relative to the vehicle body, causing the outer springs of the suspension system to move upward. When the wheel is compressed, the inner wheel is displaced downward relative to the vehicle body, and the inner spring of the suspension system is extended.In this way, the vehicle body performs a rocking motion to the left or right depending on the turning direction. The center of the swing is called the roll center.

On the other hand, when the wheel is displaced in the vertical direction, the ground contact point moves laterally (tread change), but the tread change becomes larger as the roll center becomes higher. Considering the tire wear of the wheel and the influence 51 on the steering system, the tread change becomes larger as the roll center becomes higher. , the smaller the tread change, the better.

. The object of the present invention is to provide a double wishbone suspension system in which the left and right wheels are supported by an upper arm member (link) and a lower arm member (link) attached to the body frame of a vehicle. Regarding the device, the aim is to minimize the tread change as much as possible.

The purpose of this is to position the tilting fulcrums of the left and right pairs of upper and lower arm members on the right and left sides of the vehicle center line, respectively, and to make the upper and lower arm members as long as possible. achieved.

In order to reduce tread changes, it is effective to form the upper and lower arm members to be long. This relationship is easily explained in FIGS. 1 and 2. FIG. 1 conceptually shows the support relationship of a known double Witschbon suspension system, and FIG. 2 conceptually shows the support relationship of a double Witschbon suspension system according to the present invention. 1 (I
A) and 2 (2^) are upper and lower arm members, respectively, and are supported by the vehicle body frame at tilting supports P+ and P2.

In Figure 1, upper and lower arm members 1 are located between levels A and B.
．． 2 tilts, the wheel W supported by the knuckle 3 is displaced laterally by ml, whereas in FIG.
, B, when the upper and lower arm portions I41A and 2A tilt, the wheel W supported by the knuckle 3 is displaced laterally by m2. The left and right upper and lower arm members IA and 2A are supported at tilting supports P+ and P2 located on the right and left sides of the vertical plane CF that includes the vehicle center line, respectively, and therefore their arm lengths are , sufficiently brighter than the lower arm members 1 and 2,
The displacement 1 m 2 is smaller than the displacement ff1mt.

An embodiment of the present invention shown in FIGS. 3 to 5 will be described below.

FIG. 3 shows a schematic side view of a saddle-riding type four-wheel buggy vehicle 10, which is a vehicle for traveling on rough terrain. Front wheel 12. It is equipped with a rear heavy wheel 14 and a bar-shaped handle 16 similar to a motorcycle.

Further, an engine E is mounted in the center of the vehicle body frame 20 in the longitudinal direction, and a fuel tank T^ and a saddle-shaped seat S are arranged above the engine E, and are located on both sides of the engine E.
A pair of left and right foot rest members (steps) 18 are attached to the upper frame 22. Vehicle body frame 20 together with front frame 24 etc.
It is attached to the left and right bottom frames 26 that constitute the. Left and right inclined frames 2 located in front of engine E
8 connects the upper frame 22 and the bottom frame 26,
The inclined frame 28 and the front frame 24 are connected to the left;
A right wheel support frame 30 is attached, and the wheel support frame 30 located on the right side, the front frame 24 located on the left side, and the wheel support frame 30 located on the left side,
A pair of intersecting frames 32 are attached to interconnect the front frames 24 located on the right side. Further, the left and right wheel support frames 30.30 and the left and right front frames 24.24 are interconnected to each pair of upper transverse frames 34.24. A lower lateral frame 36 is attached.

The left and right front wheels 12 each have a wheel support frame 30. Upper arm member 42 attached to front frame 24
．． The left and right rear wheels 14 are supported by a knuckle 46 connected to a lower arm member 44 (double Witschbon suspension system), and a rear fork 52 supports the left and right rear wheels 14 .

<Revision of double Uitschbon suspension system> Upper arm member 42. The lower arm members 44 are bifurcated members, and the upper arm members 42 . The lower arm member 44 is tiltably supported by protrusions 38.40 welded and fixed to the middle wheel support frame 30° front frame 24 located on the right side, and the upper arm member 4A42. The lower arm member 44 is located on the left side of the wheel support frame 30. It is supported by projecting pieces 38 and 40 that are welded and fixed to the front frame 24 in an automatic tilting manner. Upper arm member 42. The lower arm members 44 are parallel to each other and have knuckles 46 connected to their tips, and an M impact device 48 is interposed between the wheel support frame 30 and the lower arm member 44.

This embodiment is constructed as described above, with the upper arm member 42 located on the left side. The lower arm member 44 is attached to the wheel support frame 30. on the right side of the vertical plane CF including the vehicle body centerline.
The upper arm member 42 is supported by the projecting pieces 38 and 40 attached to the front frame 24 and is located on the right side. The lower arm member 44 is
On the left side of the vehicle center plane CF, the wheel support frame 30
．． Since the arm members are supported by protrusions 38 and 40 attached to the front frame 24, the arm length of each arm member is sufficiently long to prevent the front wheel 12 from being deflected in the lateral direction (vehicle width direction) when tilting in the vertical direction. In other words, the tread change is small and the intended purpose is achieved.

In the above embodiment, the widths of the 11 legs of the left and right upper arm members 42 and the left and right lower arm members 44, which have a bifurcated shape, are made almost the same, but the leg widths do not necessarily have to be made the same. .

As is clear from the above explanation, in the present invention, the tilting fulcrums of the left and right pair of upper and F position arm members are located on the right and left sides of the vehicle body center line, respectively. Since the arm member is formed to be as long as possible, the tread change when the wheel is displaced in the upward direction is small, and the amount of tire wear can be reduced.

[Brief explanation of the drawing]

Figure 1 shows a known double Uitschbon suspension 5A.
FIG. 2 is a conceptual diagram showing the support relationship of the double wishbone suspension system according to the present invention, and FIG. 3 is a conceptual diagram showing the support relationship of the double wishbone suspension system according to the present invention. FIG. 4 is a schematic side view of the riding type four-wheel buggy vehicle, FIG. 4 is a partially cutaway plan view of the main part thereof, and FIG. 5 is a view taken along the line v--v in FIG. 4. 10...Saddle type four-wheel buggy vehicle, 12...Front wheel,
14... Rear wheel, 16... Rod-shaped handle, 18...
- Footrest member, 20... Vehicle body frame, 22... Upper frame, 24... Front frame, 26... Bottom frame, 28... Inclined frame, 30... Φ wheel support frame, 32... Cross frame, 34... Upper horizontal frame, 36... Lower horizontal frame, 38
, 40... Projection piece, 42... Upper arm member, 44...
Lower arm member, 46...Putsukuru, 48...Buffer device, 50...Tie rod, 52...Rear fork,
E...Engine, S...Saddle type seat, ■...Low pressure wide tires, T^...Fuel tank.

Claims (1)

[Scope of Claims] A double wishbone suspension system in which left and right wheels are supported by an upper arm member and a lower arm member that are tiltably attached to the body frame of a vehicle, comprising a pair of left and right wheels. A suspension system for a vehicle, wherein the tilting fulcrums of the upper and lower arm members are located on the right and left sides of the vehicle body center line, respectively, and the upper and lower arm members are formed to be as long as possible.