JPH0512208U - Front suspension device - Google Patents

Abstract

(57) [Summary] [Purpose] The double wishbone type front suspension adopted for rear-wheel-drive small trucks with a comparatively large load capacity has been improved to improve the mounting performance and facilitate the securing of the spring ground clearance. . [Structure] Coil springs 10 are independently provided on the left and right suspension links. A horizontal leaf spring 11 is provided to connect the left and right suspension links. The spring constant required by the suspension is ensured by using the coil spring 10 and the leaf spring 11 together.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 TECHNICAL FIELD The present invention relates to a double wishbone type front sunspension device applied to a rear-wheel drive vehicle such as a truck.

[0002]

[Prior Art]

 Suspensions used in vehicles such as passenger cars and trucks are roughly divided into a rigid axle suspension in which the left and right wheels are connected by a single axle, and an independent suspension in which the left and right wheels can move independently. On the other hand, the rigid axle suspension has the following advantages: 1) It is inexpensive and easy to maintain because it has a simple structure. 2) It is relatively advantageous in terms of strength. 3) There is little change in the alignment due to the vertical movement of the wheel, and there is little tire wear. It has advantages and is widely used mainly for trucks and buses. In addition, the independent suspension has 1) unsprung weight and good ground contact with the wheels, which is excellent in steering stability. 2) Left and right wheels are not coupled to each other at the front wheels, which prevents interference with the steering link. 3) Generally, the stiffness of the wheel positioning link and the stiffness of the suspension spring are separated from each other, so there are advantages such as softening the spring and improving riding comfort. It is widely used not only on the front and rear wheels but also on the front wheels of small trucks.

The independent suspension described above is also classified according to its structure, but it is generally called a double wishbone type that is used as a front sunspension in a rear-wheel-drive small truck or the like. It is a thing. This type of suspension uses a double-ended arm (commonly known as a wishbone) as a control arm to withstand the braking force and the impact from the road surface, or a combination of one arm and a tension rod. Is used in combination with a coil spring, a torsion bar, a laminated leaf spring (leaf spring), a rubber spring, an air spring, a hydropneumatic spring, and the like. Torsion bars are the main type of springs that have been put into practical use as conventional front sunspensions for small trucks, but coil springs and leaf springs placed horizontally are used for some small trucks with a small load. Some were used alone.

[0004]

[Problems to be solved by the device]

 By the way, the above-mentioned double wishbone type front sun pension has the following advantages or problems depending on the type of spring used.

The conventional torsion bar, which is the mainstream of small trucks, has a relatively high efficiency of a single spring, but has a problem in mounting property and securing the ground clearance of the spring. On the other hand, the coil spring is excellent in mounting property and can easily reinforce the frame. Also, it is relatively easy to secure the spring ground clearance, but it requires a strong spring constant because of the lever ratio. Therefore, increasing the wire diameter of the coil will increase the spring constant of the coil spring, but in reality there is a limit to the wire diameter due to manufacturing problems, and the spring constant that can be secured by the coil spring alone is limited. There was a limit. In addition, the leaf springs placed horizontally are superior in terms of installation and frame reinforcement, as with coil springs, and it is relatively easy to secure ground clearance. However, in order to secure a large spring constant, the number of leaf springs is increased, resulting in large friction. Thus, although coil springs and leaf springs placed horizontally have excellent characteristics, there is a limit to the load that can be used alone, and therefore trucks with a relatively small load capacity can be used. It is in a situation where it can only be used for.

Therefore, an object of the present invention is to improve a double wishbone type suspension that is adopted on the front side of a light truck having a relatively large load and uses a torsion bar as a spring to improve the mounting property. It is to make it easier to secure the ground clearance of springs.

[0007]

[Means for Solving the Problems] The present invention is to solve the above-mentioned problems, and in a double-wishbone type front sunpension device applied to a rear-wheel drive vehicle, the left and right devices are arranged in the vehicle width direction. A horizontal leaf spring that connects the suspension links of the front wheels and coil springs that are independently provided on the suspension links of the left and right front wheels are provided, and the required spring constant can be obtained by using the leaf springs and the coil springs together. It is a front sunpension device characterized in that it is configured to be obtained.

[0008]

[Action]

 According to the above-mentioned means, the coil spring, which is excellent in mounting performance and securing the ground height of the spring, and the leaf spring that is placed horizontally are used together, so it is considerably larger than the case where each spring is used alone. It becomes possible to handle the load, and it becomes easier to secure the bodywork and the ground clearance.

[0009]

【Example】

 An embodiment of the front sunpension device according to the present invention will be described with reference to FIGS.

FIG. 1 shows a left wheel side of a front sunpension device for a rear-wheel drive vehicle, which is generally called a double wishbone type, and an upper arm swinging around a pivot center 2 supported by a frame side member 1. A suspension arm 3 is connected to a knuckle 9 via ball joints 7 and 8 to form a suspension link. This suspension link has the same structure on the right wheel side (not shown), and the left and right front wheels move independently.

Then, for the purpose of supporting the vehicle body and reducing the propagation of vibrations and impact loads from the road surface to the vehicle body, independent coil springs 10 are provided on the left and right suspension links, respectively, and in the vehicle width direction. Horizontal leaf springs 11 are installed to connect the left and right suspension links. The coil spring 10 is mounted between the mounting surface 12 of the lower arm 6 and a spring retainer 13 fixed in place on the vehicle body side (see FIGS. 2 and 3), and a shock absorber 14 is arranged at the center thereof. In the other leaf spring 11, the leaf eyeballs 15 at both ends are connected to the lower arm 6, and at the pivot center 5, it interferes with the stopper rubber 16 attached to the suspension cross member 4 on the vehicle body side, and the reaction force of the leaf spring. Is transmitted to the vehicle body side.

Reference numeral 21 is a tire, 22 is a wheel, 23 is a hub, 24 is a brake rotor, and 25 is a brake caliper.

Hereinafter, the operation of the above-described front sunpension device will be described. This device uses a coil spring 10 and a horizontal leaf spring 11 together as a spring of a front suspension for a rear-wheel drive vehicle called a double wishbone type. Since these two types of springs each have a compact layout, they have excellent mountability and it is relatively easy to secure the ground clearance of the springs. Moreover, if two types of springs are used in combination to share the load, the load on the coil spring 10 and the leaf springs 11 will be lightened, so the limit of the wire constant of the coil springs 10 will limit the spring constant and the number of leaf springs 11 will increase. The problem of friction is solved, and it becomes possible to secure a considerably large spring constant compared to single use. For this reason, coil springs and horizontal leaf springs, which could only be used in small trucks with a relatively small load capacity due to the limitation of the spring constant, have a large load capacity of, for example, 1.5 tons to 2 tons. It can be used even in small trucks, and by taking advantage of its advantages, it becomes a front suspension device that has excellent body mounting characteristics and that it is easy to secure the spring ground clearance. The front suspension structure that uses the coil spring 10 and the leaf spring 11 in combination is not limited to the suspension link mechanism illustrated in the embodiment, and can be applied to other double wishbone type suspension link mechanisms. Needless to say.

[0014]

[Effect of the device]

 According to the above-described front suspension device of the present invention, a double wishbone type index is used, in which a coil spring and a horizontal leaf spring are used in combination with the front suspension of a small truck having a large load capacity (a large spring constant is required). With the adoption of the pendent suspension, a high level of riding comfort and steering stability can be obtained. In addition, a layout that does not expose the cab back to the structure is possible, so it becomes a light-duty truck with excellent mountability, which has the effect of facilitating vehicle model development and improving the product appeal.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing a main part of FIG.

FIG. 3 is a diagram viewed from the direction of a white arrow A in FIG.

4 is a cross-sectional view taken along the line BB of FIG.

5 is a cross-sectional view taken along the line CC of FIG.

[Explanation of symbols]

 3 Upper arm 6 Lower arm 10 Coil spring 11 Leaf spring 14 Shock absorber

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[Procedure amendment]

[Submission date] November 21, 1991

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Taichiro Saito 5-3-8 Shiba, Minato-ku, Tokyo Inside Mitsubishi Motors Corporation

Claims (1)

[Scope of utility model registration request] 1. A double-wishbone type front sunpension device applied to a rear-wheel drive vehicle, wherein a lateral leaf spring, which is arranged in the vehicle width direction and connects suspension links of left and right front wheels, and left and right front wheels. A front sunpension device comprising a suspension link and a coil spring independently provided, and a leaf spring and the coil spring are used together to obtain a required spring constant.