KR20030017818A - Shock absorber - Google Patents

Abstract

PURPOSE: A shock absorber for automotive suspension system is provided to enlarge capacity of a trunk room in layout and to reduce an inputting force to a sliding shaft by increasing a lever ratio. CONSTITUTION: A shock absorber(2) comprises an upper eye bush(10) and a lower eye bush. The upper eye bush is installed in the upper side portion of an upper dust cover(14). The lower eye bush is installed on the lower side portion of an oil cylinder(18). The upper eye bush and the lower eye bush are installed in opposite. Therefore, the shock absorber is installed vertically in small room and performance and durability are improved.

Description

Shock absorber of car suspension {SHOCK ABSORBER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorber applied to a suspension of a vehicle, and more particularly, to increase the capacity of a trunk room on a layout and to increase the lever ratio compared to a typical eye-eye type shock absorber. The present invention relates to a shock absorber that can be increased and arranged to reduce the force input to the sliding shaft to improve performance and durability.

Suspension in a vehicle exists between a vehicle body and a wheel, and is a device that connects these two rigid bodies by using one or more links. It is supported by springs and hydraulic shock absorbers in the vertical direction, and in other directions. By properly matching the high rigidity and flexibility, it performs a function to mechanically match the relative movement between the vehicle body and the wheel.

Such suspension system effectively blocks irregular input of the road surface generated while driving the vehicle to provide a comfortable riding comfort of the occupant, and provides driving convenience by appropriately controlling the shaking of the vehicle body caused by driver's driving behavior and road curvature. In addition, it is necessary to satisfy the basic condition that the vehicle should be kept stable when turning and braking by maintaining the vertical load on the tire ground plane at an appropriate level when driving on irregular roads.

In order to satisfy the above conditions, various kinds of suspension devices have been developed and applied to actual vehicles, and shock absorbers are applied to the suspension devices as damping force generating mechanisms.

The shock absorber suppresses the vibration of the vehicle by absorbing the vibration vibration up and down on the vehicle, improves the ride comfort, protects the appropriate cargo, and extends the life by reducing the dynamic stress of each part of the vehicle. It is possible to improve the driving performance of the vehicle by controlling the tire's foldability by controlling the tire and suppressing the change of attitude due to the inertia force.

Considering this example, one example of the conventional torsion beam suspension device is illustrated, but as shown in FIG. 4, the shock absorber 100 and the spring 102 are disposed separately, but the shock absorber 100 is the side member 104. ) And the spring 102 between the rear side member 104 and the rear end of the torsion beam axle 106 are common examples.

And looking at the configuration of a typical example of the shock absorber as shown in Figure 5, typically the upper eye bush 108, the lower eye bush 110, the upper dust cover 112, the piston rod 114, the oil cylinder 116 It is composed of

However, in this shock absorber 100, there are 2 * R1, which are outer diameters of upper and lower bushes 108 and 110 for mounting to the vehicle body and the torsion beam axle 106 in addition to the portion of S1 that performs a function. Therefore, there is a difficulty in mounting the shock absorber 100 to the side member 106.

More specifically, it is common to mount the top eye bush 108 to the wheel housing 118 because it is difficult to mount the shock absorber 100 to the sidemember 106 in view of the strokes required for bumps and rebounds. Yes.

However, in this case, by increasing the wheel housing 118, the capacity of the trunk room is reduced, which is disadvantageous in terms of a premise package, as shown in FIG. There is an example in which the overall length of the shock absorber 100 is shortened to R1 by being disposed at the lower side surface portion.

However, in the case of the conventional shock absorber, although it can be mounted between the side member 106 and the torsion beam axle 108, as shown in FIG. You must do it.

Accordingly, since the lever ratio is very small and the load input to the sliding shaft, that is, the axle shaft, is considerably large, the durability and performance of the shock absorber are deteriorated.

More specifically, the lever ratio is represented by the ratio of the stroke amount of the shock absorber to the bump amount of the tire, and the load input to the sliding shaft is inversely proportional to the lever ratio. This increases the durability and performance.

That is, when looking at the load to the conventional shock absorber while looking at Figures 6 and 8, FL1 is a load acting from the lower eye bush 110 to the upper eye bush 108 at the time of bump, this load is the interphase eye bush 108 ) Acts along the piston's sliding path, so loads like FU1X and FU1Y work.

As a result, the side force FU1X = FU1Y * {a / (b + c)} and the bending moment is generated Mb1 = FU1Y * a-FU1X * b will have a deterioration in durability and performance.

Therefore, the present invention has been invented to solve the above problems, the object of the present invention is to increase the capacity of the trunk room on the layout of the layout compared to the typical eye-eye type shock-over, lever ratio By increasing the arrangement, it provides a shock absorber that reduces the force input to the sliding shaft to improve performance and durability.

1 is a side view of a suspension device showing an application state of the present invention.

2 is a side view of shock absorber according to the present invention;

3 is a view for explaining the operation of shock absorber according to the present invention.

Figure 4 is a side view of a suspension device showing a state of application of conventional shock absorber.

5 is a shock absorber side view of a conventional first embodiment.

Figure 6 is a shock absorber side view of a second conventional embodiment.

Figure 7 is a side view of a suspension apparatus showing a shock absorber mounting state of the second conventional embodiment.

8 is a view for explaining a load distribution of the second embodiment.

In order to realize the above object, the present invention is provided in a shock absorber having an upper eye bush, a lower eye bush, an upper dust cover, a piston rod, and an oil cylinder to be applied to a suspension device of an automobile to exert damping force against vertical vibration. ,

The upper eye bush is mounted on the upper side of the upper dust cover, and the lower eye bush is mounted on the lower side of the oil cylinder to provide a shock absorber of the vehicle suspension in which the upper and lower eye bushes are mounted in opposite directions. do.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described in detail.

Fig. 1 is a side view of a torsion beam suspension system for showing an application example of the present invention, in which 2 is a shock absorber.

The shock absorber 2 is disposed between the side member 4 and the torsion beam axle 6, as shown, and the rear end of the rear side member 4 and the torsion beam axle 6. The spring 8 is arrange | positioned in between.

The general configuration of the shock absorber 2 is, as shown in 2 and 3, the upper eye bush 10, the lower eye bush 12, the upper dust cover 14, the piston rod 16, the oil cylinder 18 It is composed of

In this pull-up soover (2), in the present invention, as shown in Figure 2, the upper eye bush 10 and the lower eye bush 12, the upper side of the upper dust cover 14, the upper end side and the oil cylinder in opposite directions It was arrange | positioned at the lower end side surface of (18).

Accordingly, the length is smaller by 2 * R1 than the typical eye-eye type as shown in FIG. 6, and the length is reduced by R1 as compared to the type as shown in FIG. 7, so that the bar can be mounted almost vertically as shown in FIG. 1. By increasing the lever ratio, the load input to the sliding shaft can be greatly reduced.

Considering the side force and bending moment of the shock absorber of the present invention as shown in Figs. 2 and 3, the piston 20 and the oil cylinder are integrally formed at the lower end of the piston rod 16 In the friction zones Q1 and Q2 of (18), the side force FU2X and the bending moment Mb2 can be obtained.

That is, FU2X = FU2Y * {(d + f) / (g + e)} = FU2Y * {(a + f) / (b + c)

Mb2 = FU2Y * d-FU2X * e = FU1Y * a-FU2X * b

As can be seen from the above equation, if FU2Y is the same, FU2X is larger than conventional FU1X and Mb2 is smaller than Mb1, but the lever ratio is larger than conventional, so FU2X is smaller than FU1Y. Mb2 is less than Mb1 ?? It becomes small.

Accordingly, the shock absorber 2 according to the present invention has a slightly larger side force than the conventional one, but the bending moment is much smaller, which is advantageous in terms of performance and durability of the shock absorber.

As described above, according to the present invention, it is possible to mount the shock absorber more vertically even in a smaller space, thereby increasing the layout of the trunk room on the layout compared to the typical eye-eye type shock absorber.

In addition, it is an invention that can improve the performance and durability of the shock absorber by reducing the load input to the sliding shaft by increasing the lever ratio.

Claims (1)

In the shock absorber which has an upper eye bush, a lower eye bush, an upper dust cover, a piston rod, and an oil cylinder, it is applied to a vehicle suspension system and exhibits damping force against vertical vibration. The upper eye bush is mounted on the upper side of the upper dust cover, the lower eye bush is mounted on the lower side of the oil cylinder, the upper and lower eye bushes, characterized in that the mounting of the vehicle suspension device in the opposite direction over.