JPH0340644Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a front wheel suspension system for a vehicle, particularly a truck.

[Prior Art] As shown in FIG. 1, in a conventional front wheel suspension system, a knuckle 3, which is integral with an axle 5 that supports the front wheel, is swingably supported by king pins 4 at both ends of a front axle 12. . A steering mechanism is connected via a link to the end 2a of the knuckle arm 2, which is integral with the knuckle 3, so that the axle 5 is deflected by a turning angle α about the king pin 4 as the steering operation is performed. .

Tie rod arms 6 projecting rearward are connected to the left and right knuckles 3, and the ends of these tie rod arms 6 are connected to each other via a ball joint 7 to a tie rod 8.
, and the axles 5 on both sides are configured to interlock with each other.

A flat mounting surface 10 that supports a suspension spring is formed on the upper surface of the front axle 12, and U
Bolt holes 9, 9a are provided through which bolts are inserted. As shown in FIG. 2, pads 15 are superimposed on the mounting surface 10 so as to sandwich both upper and lower surfaces of a suspension spring 16 made up of a plurality of leaf springs, and a pair of front and rear U bolts 14, 14a is inserted into the aforementioned bolt holes 9, 9a, and a nut 13 is tightened at the lower end. In this way, the suspension spring 16
is coupled to the center of the front axle 12, and both ends of the suspension spring 16 are supported by the vehicle body frame by known means.

In a conventional front wheel suspension system, as shown in FIG. 1, the mounting surface 10 is configured to be symmetrical about a central axis a connecting the centers of the king pins 4 supported at both ends of the front axle 12. That is, the front bolt hole 9 and the rear bolt hole 9a are aligned with the center axis a.
arranged symmetrically with respect to However, for medium-sized trucks with relatively small outer diameter wheels,
In relation to the wheelbase, it is desirable to greatly deflect the front wheels to reduce the turning radius, but in this case, the problem arises that the front axle 12 and tie rod 8 interfere with each other, making it impossible to take a large turning angle of the tie rod arm 6. be. That is, since the length of the tie rod arm 6 extending rearward from the nutcle 3 extends inside the drum-shaped wheel disk supported by the axle 5, the length of the tie rod arm 6 is limited by the inner diameter of the wheel disk. Front axle 1
The distance between the tie rod 2 and the tie rod 8 is also determined by the inner diameter of the wheel disc.

[Problems to be solved by the invention] However, if the turning angle α of the front wheels is set large in order to reduce the turning radius, the rotation of the tie rod arm 6 about the king pin 4 causes the tie rod 8 to move to the rear of the front axle 12. , and finally hits the front axle 12, making it impossible to rotate the knuckle 3 any further.

As mentioned above, the position of the connection between the tie rod arm 6 and the end of the tie rod 8 by the ball joint 7 is as follows.
It cannot be displaced backwards or downwards due to interference with the rim of the wheel disc. In order to avoid interference with the wheel disc rim, if the ball joint is moved toward the center of the vehicle body and displaced backwards or downwards, the cutting angle of the front wheel toward the center of the turn will increase when turning, based on the anchor mangeant theory. However, the turning angle of the outside front wheel does not increase, making it impossible to turn smoothly. Furthermore, tie rod arm 6 and tie rod 8
Without changing the position of the ball joint with the tie rod 8.
Offset the end of the tie rod 8 downward.
There is a problem in that a moment is applied to the structure, and this strength must be increased.

In addition, Japanese Utility Model Application Publication No. 47-21312 describes a rear wheel suspension system in which the axle center line and the seat center of the leaf spring are shifted from each other, but the leaf spring mounting surface formed on the axle is aligned with the center of the axle. Since it does not have a configuration for biasing the axle forward, it is not possible to obtain the effect of increasing the distance between the axle and the tie rod provided on the rear side.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to overcome the drawbacks of the conventional front wheel suspension system as described above, and to increase the distance between the rear part of the front axle and the tie rod. It is possible to prevent interference, increase the turning angle of the front wheels, and reduce the turning radius of the vehicle.
Another object of the present invention is to provide a front wheel suspension system that can be easily implemented by simply biasing the mounting surface of the front axle forward without causing any change in the arrangement position of the tie rod or the steering mechanism.

[Means for solving the problem] In order to achieve the above object, the configuration of the front wheel suspension system of the present invention is such that the front axle is mounted offset forward of the axle center axis that connects the center of the king pin at both ends of the front axle. A suspension spring is attached to the surface, and a tie rod is provided on the rear side of the front axle.

[Function] As described above, the front wheel suspension system of the present invention has a suspension spring attached to the mounting surface of the front axle that is offset forward of the axle center axis line connecting the king pin centers at both ends of the front axle. By providing the tie rod on the rear side, it is possible to increase the distance between the rear part of the front axle and the tie rod, thereby preventing interference between the rear part of the front axle and the tie rod, and thereby preventing the front wheel from turning. Since the angle can be increased and the turning radius of the vehicle can be reduced, and the mounting surface of the front axle is only biased forward, there is no need to bring about any changes in the installation position of the tie rod or the steering mechanism. There is no.

[Embodiment] As shown in FIG. 3, the front wheel suspension system of the present invention has a mounting surface 10 supporting a suspension spring 16 of a front axle 12 attached to a central axis a of the front axle 12, that is, a king pin 4 supported at both ends. It is constructed by being displaced forward by an offset amount t with respect to an axis a connecting the centers of the two. As a result, the distance s between the tie rod 8 and the rear part of the front axle 12, that is, the distance between the tie rod 8 and the rear part of the front axle 12 is increased.
A large distance can be provided between the mounting surface 10 and the mounting surface 10 that protrudes rearward. In addition, the front axle 12
The cross-sectional shape of the suspension spring 16 is as shown in FIG.
The flange 12a protrudes forward, that is, to the right in the figure, at the mounting portion, so that the center of the mounting surface 10 is offset by an offset amount t with respect to the central axis a of the front axle 12. The suspension spring 16 is fixed to the mounting surface 10 of the flange 12a by a pair of front and rear U bolts 14, 14a.

Since the front wheel suspension system of the present invention is configured as described above, it is possible to increase the distance s between the rear part of the front axle 12 and the tie rod 8.
It is possible to prevent interference with the front wheels, increase the turning angle of the front wheels, and reduce the turning radius of the vehicle.

[Effects of the invention] As described above, the front wheel suspension system of the present invention has a suspension spring attached to the mounting surface of the front axle that is offset forward of the axle center axis connecting the king pin centers at both ends of the front axle, and Since the tie rod is provided on the rear side, it is possible to increase the distance between the rear part of the front axle and the tie rod, thereby preventing interference between the rear part of the front axle and the tie rod and adjusting the turning angle of the front wheel. The turning radius of the vehicle can be increased and the turning radius of the vehicle can be reduced, and since the mounting surface of the front axle is only biased forward, there is no need to make any changes to the installation position of the tie rod or the steering mechanism. Since there is no such thing, it has an effect that can be easily implemented.

[Brief explanation of drawings]

FIG. 1 is a plan view of a conventional front wheel suspension system, FIG. 2 is a side sectional view of the same, FIG. 3 is a plan view of a front wheel suspension according to the present invention, and FIG. 4 is a side sectional view of the same. 3...Natsukuru Arm, 4...Kingpin, 6
...Tie rod arm, 8...Tie rod, 9...
...Bolt hole, 10...Mounting surface, 12...Front axle, 14...U bolt, 16...Suspension spring.

Claims (1)

[Scope of utility model registration request] A front wheel suspension system comprising: a suspension spring attached to a mounting surface of the front axle that is offset forward of an axle center axis connecting the centers of king pins at both ends of the front axle; and a tie rod provided on the rear side of the front axle.