JPH01195105A - Rear suspension used in automobile - Google Patents

Abstract

PURPOSE:To improve riding comfortableness, controllability end stability by disposing a pair of upper arms in such a manner as to be tilted lower at the front and a V-shaped lower arm in such a manner as to be tilted higher at the front in the longitudinal direction from a rear axle side, and intersecting both directions in front of the rear axle. CONSTITUTION:Upper arms 11, 12 have forward ends 14, 15 rotatably connected to a bracket of a chassis and rear ends 16, 17 rotatably connected to axle tubes 31, 32 and the arms are disposed in such a manner as to be tilted lower at the front as a whole. On the other hand, a V-shaped lower arm is disposed in such a manner as to be tilted higher at the front, and the forward ends 18, 19 thereof are positioned below the forward ends of the upper arms 11, 12 and both members 11, 12 and the member 13 interset one another at a point C. The intersecting point C is set to the center of a roll at a height Hc above the road surface 40 and set higher than the height Tt of the axis of a rear axle. By this arrangement, riding comfortableness, controllability and stability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to rear suspensions used in automobiles.

BACKGROUND TECHNOLOGY The main rear suspension for large vehicles such as trucks and buses uses an axle suspension method, which has disadvantages in terms of ride comfort, maneuverability, and stability compared to independent suspension methods for passenger cars.

OBJECTS AND PROBLEMS OF THE INVENTION An object and problem of the present invention is to provide a rear suspension for use in automobiles that improves ride comfort, maneuverability, stability, etc. of automobiles that use an axle type axle.

Summary of the structural invention related to the object/problem: Contents of the claimed invention In relation to the above-mentioned object/problem, the rear suspension used in the automobile of the present invention has an arrangement in which a rear suspension is provided with an appropriate spacing in the lateral direction of the chassis. a pair of upper arms that connect the rear axle side to the chassis side with a downward slope in the front direction in the longitudinal direction of the chassis; It is connected to the chassis side and includes a V-shaped lower arm whose front upward slope direction intersects the front downward slope direction of the upper arm in front of the rear axle. - Steering and improving responsiveness.

Description of Specific Examples Preferred specific examples of the rear suspension used in an automobile according to the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a specific example 1 of a rear suspension used in an automobile according to the present invention, which is applied to a truck 30.
It shows 0.

The rear suspension 10 includes a pair of rear leaf springs (not shown) supporting axle tubes 31, 32 of a rear axle (not shown) to a chassis (not shown).
), a pair of upper arms 11.12, and a V
The rear axle, of course, fixedly supports the rear wheels 35, 36, 37, 38 at both ends, and its pair of rear leaf springs are normally , which is connected to its chassis.

The pair of upper arms 11, 12 are appropriately spaced apart in the lateral direction of the chassis, as can be seen from FIG. In the longitudinal direction, the axle tubes 31, 32 of the rear axle are connected with the front downward slope to the brackets (not shown) of the chassis. Of course, the upper arm 11.12 attaches to the bracket of the chassis via a ball joint (not shown) at the tip 14°1.
5 are rotatably connected to each other, and the rear ends 16 and 17 are rotatably connected to the bras 21 and 22 screwed to the axle tubes 31 and 32 thereof via ball joints (not shown). Thus, a predetermined angle of forward downward slope is given.

As can be seen from FIG. 2, the ■-shaped lower arm 13 connects its rear axle side to the chassis side with a front upward slope in the longitudinal direction of the chassis. In particular, the tip 18.19 of the V-shaped lower arm 13 is connected to a ball joint (not shown) in a bracket (not shown) of the chassis below the tip 14.15 of the upper arm 11.12. ), and the rear end 20 of the V-shaped lower arm 13 is
The differential of the final reduction gear 33 is moved backward by a distance (Lc) from the axis of the rear axle.
The case 34 is rotatably connected to the lower part of the case 34 via a ball joint (not shown), and in front of the rear axle, the direction of the front upward slope is aligned with the front downward slope of the upper arm 11 and 12. The directions are intersecting. That is, the intersection point (C) is a distance Ld forward of the axis of the rear axle, and the height from the road surface 40 (
Hc) is set at the roll center of the vehicle body. Of course, the intersection point (C) is set higher than the height (T t ) of the axis of the rear axle from the road surface 40.

Also, in this way, the rear end 2 of the V-shaped lower arm 13
0 is rotatably connected to the lower side of the differential case 34 via a ball joint, and the roll center of the rear axle is at a height (Hr) from the road surface 40.
) is set low.

Next, when the truck 30 runs, the operation of the rear suspension 10 configured as described above will be described. When the truck 30 is accelerated, the rear wheels 35, 36, 37 degrees 38 If driving force Ft is generated, anti-dive force (Ft-Tt/Ld)
acts on the roll center C of the car body, and the track 30
Reduce pitching.

Also, if the truck 30 is decelerated, or
When driving on an uneven road surface 40, the rear wheels 35, 36
, 37. 38, if a braking force or a disturbance Fb from the road surface 40 occurs or is received, the anti-lift force (Fb, Tt/Ld) will change the roll center (C) of the vehicle body.
As with the previous acceleration, the pitching of that track will be reduced. In particular, regarding the seam of the road surface 40, the lower arm 13 is swung vertically around a ball joint at its tip 18. Since the rear end 20 of the lower arm 13 is moved back and the so-called rear axle is moved back, a buffering effect, a so-called harshness reduction effect, is produced.

Furthermore, when the truck 30 turns, the roll center (Hr) of the rear axle is low, so the load transfer is small and the cornering power of the tires is effectively exerted. height (t(c
) is high, so the roll of the vehicle body is reduced. In addition, since the rear end 20 of the lower arm 13 is set back a distance (Lc) from the axis of the rear axle,
The lateral force (Fc) causes the rear axle to turn in phase with the front wheels around point 20, creating an amplifier steer effect and improving maneuverability and stability. Also, due to the roll of the vehicle body, its upper arms 11, 12 are swung up and down in opposite directions, and in FIG.
The projected lengths of these upper arms 11, 12 are varied from long on the one hand to short on the other hand, and accordingly:
The rear axle turns in-phase with the front wheels about point 20, resulting in an amp steer effect and improved maneuverability and stability.

In the above-mentioned rear suspension engine 10, the rear axle was explained as being supported by a pair of rear leaf springs, but the rear axle was supported by a pair of rear leaf springs.
It may also be supported by a spring.

Also, although the upper arm 11.12 has been described as being connected to the chassis and axle tube 31.32 with a ball joint, the upper arm 11.12 may be connected to the chassis and axle tube 31.32 with an intervening rubber bushing. It is connectable to the chassis and to the axle tubes 31, 32, and similarly the lower arm 13 is connectable to the chassis and to the final reduction gear 33 via a rubber bushing.

Advantages and Benefits of the Invention From the foregoing, compared to the rear suspensions of automobiles that have already been proposed and used, the rear suspension used in the automobile of this invention has a pair of upper arms that are connected to the chassis. are spaced at appropriate intervals in the lateral direction of the chassis, and connect the rear axle side to the chassis side with a forward downward slope in the longitudinal direction of the chassis, and
a type lower arm connects its rear axle side to its chassis side with a forward upward slope in the longitudinal direction of its chassis;
In addition, in front of the rear axle, the direction of the front upward slope intersects with the direction of the front downward slope of the upper arm, so that the rear suspension used in the automobile of the present invention improves ride comfort. In addition, straightness,
As turning performance is improved, maneuverability and stability are improved.

As for the relationship between the invention and the specific examples, from the specific examples of the present invention described with reference to the drawings, various design modifications will be apparent to those who have ordinary knowledge in the technical field to which this invention pertains. It is easy to do this, and furthermore, the content of the invention is essential to the establishment of the invention that accomplishes the task of the invention, and the technical essence of the invention that is the nature of the invention. and can be easily replaced by a form that is objectively recognized as incorporating it.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of a rear suspension used in an automobile of the present invention applied to a rear axle of a truck, and FIG. 2 is a schematic front view of the rear suspension shown in FIG. 1. . 11.12...Upper arm, 13...V-shaped lower arm.

Claims (1)

[Claims] Appropriately spaced in the lateral direction of the chassis, and
a pair of upper arms connecting the rear axle side to the chassis side with a forward downward slope in the longitudinal direction of the chassis; and a pair of upper arms connecting the rear axle side with the chassis side with a front upward slope in the longitudinal direction of the chassis. , and in front of the rear axle, the direction of the front upward slope intersects with the direction of the front downward slope of the upper arm.
Rear suspension used in automobiles, including arms.