DE102008050192B4 - Vehicle vibration damping system - Google Patents

Abstract

Vehicle vibration damping system having at least two vehicle parts (1, 2), and a scissor frame (3, 4) arranged between the two vehicle parts (1, 2), wherein a scissor arm (4) of the scissors frame (3, 4) is fixed and rotatable on the vehicle part (3). 1) is mounted in a fixed bearing (8), and wherein the vehicle parts (1, 2) by means of at least one suspension element (9) are oscillating relative to each other, wherein a vertically extending component (10) arranged on the inside of the vehicle part (1) Fixed bearing (8) is fixed, wherein the vertical member (10) and the scissor arm (4) are mounted together in the fixed bearing (8) and connected thereto in such a way that a flow of force from the vertical member (10) on the scissor arm ( 4) is given, so that a spring force of the suspension element (9) counteracts a vibrational movement of the scissor arm (4), wherein a rolling element (11) on the vertical member (10) is unrolled, wherein the suspension element (9) m it is fastened at one end to the vehicle part (1) and at a second end to the rolling element (11), and wherein this rolling element (11) and the vertical component (10) belong to one setting unit, and the setting unit (11, 14) also has a lever (14), ...

Description

The invention relates to a vehicle vibration damping system with at least two vehicle parts, which are movable relative to each other by means of at least one suspension element, according to the preamble of claim 1.

Conventionally, in the vehicle area, two mutually swinging vehicle parts, such as a seat portion of a vehicle seat, which is resiliently disposed relative to a vehicle seat bottom, a suspension element and an additional damping element in the form of a damper to take energy from the suspension system and dampen the spring movements, if in the case of resonance strong deflections of this spring-oscillating system are caused.

The structure of such a damper can be designed differently. For example, hydraulic dampers essentially consist of a piston guided on a piston rod in an oil-filled cylinder. With axial movement of the piston rod and thus of the piston relative to the cylinder, the oil must flow through narrow channels and valves in the piston. Due to the resistance, which is given to the oil thereby, pressure differences are generated, which generate the damping forces via effective surfaces. With increasing speed of the piston movement, the flow resistance and thus the damping effect increases, whereby within certain limits, this characteristic can be specifically influenced.

Also mechanical shock absorbers are known. These consist in principle of spring-loaded friction surfaces. Layered leaf springs have multiple spring blades and are combined spring / damper units. The deflection of the spring absorbs the shock and stores it in the spring. The friction between the individual spring leaves dampens the vibration and converts part of the spring force into heat.

Likewise, air spring damper are known in which the medium air can take over both spring and damper tasks.

Frequently, such an arrangement of a damper, for example in a vehicle seat or between a driver's cab and a vehicle base frame, requires a more complex construction in order to obtain optimum damping of differently directed and differently strong vibrations. There must be a precise match between the damping and suspension properties, the z. B. allow a seating comfort range within a suspension travel force curve of a vibrating vehicle seat, are taken into account. Moreover, these damper systems have the disadvantage that they reduce the vibration reduction in the subcritical and supercritical region and thus worsen the vibration comfort.

Furthermore, vehicle seats, which comprise at least one damping and / or spring element, from the documents DE 10 2008 016 685 B3 . DE 199 38 077 A1 . DE 199 02 224 C1 . DE 10 95 684 A . US Pat. No. 1,281,079 A1 . DE 10 2008 045 493 A1 . DE 31 34 533 A1 . US 3,013,794 A . DE 695 00 833 T2 . DE 40 15 416 A1 . GB 1 092 341 A . US 2007/0035 074 A1 known.

It is therefore an object of the invention to provide a vehicle vibration damping system with improved vibration comfort, which has at least two vehicle parts, which are oscillating relative to each other by means of at least one suspension element, wherein in such a system, the arrangement of one or more dampers is unnecessary. The use of dampers should be superfluous depending on the design of the system presented here or it should be possible to resort to dampers with low power dissipation in order to minimize the negative influence of the damper in the supercritical region as possible. A supercritical range refers to the frequency range in which the introduced oscillation is reduced.

This object is achieved according to the features of claim 1.

An essential point of the invention is that the vehicle vibration damping system proposed here is provided with at least two vehicle parts, and a scissor frame arranged between the two vehicle parts, wherein a scissor arm of the scissors frame is mounted fixed and rotatable on the vehicle part in a fixed bearing, and wherein the vehicle parts by means of at least one suspension element are oscillatory relative to each other, wherein
a vertically extending component is fastened to the fixed bearing arranged inside the vehicle part, wherein
the vertical component and the scissor arm are mounted together in such a way in the fixed bearing and are connected to it in such a way that a force flow is given from the vertical member to the scissor arm, so that a spring force of the suspension element ( 9 ) a vibratory movement of the scissor arm ( 4 ), wherein a rolling element on the vertical member is unrolled, wherein the suspension element with one end to the vehicle part and with a second end to the rolling element is attached, and wherein this rolling element and the vertical member belonging to an actuating unit, and the actuating unit also has a lever which has at one end with the rolling element and at a second end with an inertia element which represents a weight and a predetermined inertial mass, wherein the inertial force of the inertia member acts upon vibration of at least one of the vehicle parts via the lever and the rolling element to continuously readjust at least one spring-related parameter of the suspension element to change a vibration transmission function.

In this respect, due to the inventive concept of the present patent object, an inertial element as inertial mass means of a lever mechanism connected to the suspension element such that upon deflection of one of the vehicle parts and thus the inertial mass, which is moved only delayed due to their inertia, the suspension element has a modified transfer function by z. B. shows a shift of the Federfußpunktes (change in the lever ratios) and thus a different suspension effect of the suspension element is achieved. In accordance with optimized implementation of the change in the transfer function, a damper can be omitted.

It is thus achieved that the instantaneous position of the inertia element, which is determined by an acceleration movement of one of the vehicle parts on which the inertia element is disposed, sets the lever mechanism in relation to the suspension element such that the resulting change in the spring force against Acceleration movement of the introduced vibration acts. As a result, a vibration amplitude of the entire vehicle vibration damping system occurring with the introduced vibration is reduced and thus damped.

Ideally, it is achieved by such a system that the inertia element always moves in the opposite direction to the externally introduced oscillatory motion in the vehicle vibration damping system or is positioned oppositely to effect a spring-damping effect.

The size of the adjusting spring-relevant parameter is dependent on the acceleration value of the inertial element in case of occurring vibration movements.

The two vehicle parts can be a vehicle seat bottom part and a vehicle seat top part, on which a seat surface with a backrest is arranged, a vehicle base frame and a sprung gear train and / or a vehicle cabin and a vehicle base frame. This makes it clear that the vehicle vibration damping system according to the invention is applicable both to vehicle seats and to vehicle cabs, as are known for example in tractors, or to the suspension of vehicles.

The inertia element is a mass element which is provided with a predeterminable mass, that is to say it can also be changed in its inertia by exchanging a weight or by changing the lever ratios in order to obtain an optimal vibration damping behavior of the vehicle vibration damping system. This can be avoided, for example, that the suspension element is deflected to the attacks when an extremely strong vibration is introduced into the vibration damping system from outside. In the resonance range, this system is particularly efficient. The change in the leverage ratios can be used to adjust to different masses to be sprung (weight adjustment).

Further advantageous embodiments will become apparent from the dependent claims.

Advantages and expediencies can be found in the following description in conjunction with the drawing. Hereby shows:

1 in a schematic representation of a vehicle seat with a vehicle vibration damping system according to the invention;

In 1 a vehicle seat with the vehicle vibration damping system of the invention is shown in a schematic representation. A vehicle seat shell 1 is with a vehicle seat base 2 by means of a scissors rack 3 . 4 and attach it to plain bearings 5 . 6 as well as fixed camps 7 . 8th connected so that it can swing up and down.

One in the vehicle seat shell 1 arranged spring or a suspension element 9 is at one end to a frame part of the vehicle seat upper part and with a second end to a priority on the fixed bearing 8th fastened, essentially vertically extending component 10 attached.

An actuating unit for the vehicle vibration damping system according to the invention has a semicircular design on the flat component 10 unrollable rolling element 11 on which in its center 15 with an inertia element 12 , which has a predeterminable inertial mass, is connected.

The connection between the inertia element 12 , which represents a weight, and the rolling element 11 is by means of a lever 14 or lever mechanism made.

As soon as the vehicle seat top 1 opposite the vehicle seat bottom 2 moved down or the vehicle seat base 2 from below against the vehicle seat top 1 moved due to the passage of the vehicle through a pothole, finds a time-delayed acceleration of the inertial element 12 instead, whereupon the inertia element 12 different positions, as indicated by the reference numerals 12a and 12b is reproduced. This is illustrated by the double arrow 13 ,

In response to the new position of the inertia element 12 is the rolling element 11 in a new rolling position, as indicated by the reference numbers 11a and 11b is reproduced. This means a change in the leverage ratios and thus results in a change in the transfer function.

For example, if a quick vibration from below on the vehicle seat base 2 acting and then again an opposite oscillation of the two components 1 . 2 takes place, becomes the inertia element 12 swing back with a corresponding time delay and thereby counteract a caused by the initiated oscillation spring deflection.

Claims (6)

Vehicle vibration damping system with at least two vehicle parts ( 1 . 2 ), and one between the two vehicle parts ( 1 . 2 ) arranged scissors rack ( 3 . 4 ), with a scissor arm ( 4 ) of the scissors rack ( 3 . 4 ) stationary and rotatable on the vehicle part ( 1 ) in a camp ( 8th ), and wherein the vehicle parts ( 1 . 2 ) by means of at least one suspension element ( 9 ) are oscillatory relative to each other, wherein a vertically extending component ( 10 ) on the inside of the vehicle part ( 1 ) ( 8th ), wherein the vertical component ( 10 ) and the scissor arm ( 4 ) so together in the camp ( 8th ) are mounted and connected to it such that a force flow from the vertical component ( 10 ) on the scissor arm ( 4 ) is given, so that a spring force of the suspension element ( 9 ) a vibratory movement of the scissor arm ( 4 ), wherein a rolling element ( 11 ) on the vertical component ( 10 ) is rollable, wherein the suspension element ( 9 ) with one end on the vehicle part ( 1 ) and with a second end on the rolling element ( 11 ), and wherein this rolling element ( 11 ) and the vertical component ( 10 ) belong to an actuator, and the actuator ( 11 . 14 ) also a lever ( 14 ), which at one end with the rolling element ( 11 ) and with a second end having an inertia element ( 12 ), which is a weight and has a predetermined inertial mass, is connected, said inertia element ( 12 ) with at least one of the vehicle parts ( 1 . 2 ) is in mutual interaction, and the inertial force of the inertia element at occurring vibration movements of at least one of the vehicle parts ( 1 . 2 ) over the lever ( 14 ) and the rolling element ( 11 ) for the continuous readjustment of at least one spring-relevant parameter of the suspension element ( 9 ) acts to change an oscillation transfer function. Vehicle vibration damping system according to one of the preceding claims, characterized in that a first vehicle part, a vehicle seat bottom ( 2 ) and a second vehicle part, a vehicle seat upper part ( 1 ) is with seat. Vehicle vibration damping system according to one of the preceding claims, characterized in that a first vehicle part is a vehicle base frame and a second vehicle part is a sprung wheel train. Vehicle vibration damping system according to one of the preceding claims, characterized in that a first vehicle part is a vehicle cabin and a second vehicle part is a vehicle base frame. Vehicle vibration damping system according to one of the preceding claims, characterized in that an inertia element is a mass element ( 12 ) with a predeterminable mass. Vehicle vibration damping system according to one of the preceding claims, characterized in that a further suspension element, in particular a gas spring or a mechanical compression spring, between the vehicle parts ( 1 . 2 ) is arranged.

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